Midwest Dry Type Transformers

Midwest Dry Type TransformersReliable and Efficient Performance– From a Name You Know

Midwest Electric Products

Catalog

www.midwestelectric.com Midwest Transformer Catalog 1Data subject to change without notice

Dry Type Transformers

General Information............................................................2General Purpose .................................................................3Single-Phase TP-1, Aluminum ...........................................4Single-Phase TP-1, Copper ...............................................5Three-Phase TP-1, Aluminum............................................6Three-Phase TP-1, Copper................................................8

K-FactorThree-Phase TP-1, Aluminum............................................9Three-Phase TP-1, Copper..............................................13

K-Factor Low NoiseThree-Phase TP-1, Aluminum..........................................17Three-Phase TP-1, Copper..............................................19

Low NoiseThree-Phase TP-1, Aluminum..........................................21Three-Phase TP-1, Copper..............................................22

Noise Isolation – Guard I (Electrostatic Shield) ............23Three-Phase TP-1, Aluminum..........................................24Three-Phase TP-1, Copper..............................................25

Noise Isolation – Guard II (Electrostatic Shield PlusSpike/Surge Protection) ................................................26Three-Phase TP-1, Aluminum..........................................27Three-Phase TP-1, Copper..............................................28

Harmonic Mitigating – Guard IIIThree-Phase TP-1, Copper..............................................29

Ultra Energy EfficientThree-Phase CSL-3, NEMA Premium™, Copper .............30K-Factor, Three-Phase NEMA Premium™, Copper..........31Harmonic Mitigating, Three-Phase NEMA Premium™,Copper ...........................................................................32

Totally Enclosed, Nonventilated – TENVAluminum and Copper......................................................33

MidtappedAluminum..........................................................................35Copper ..............................................................................36

Accessories and Lugs ......................................................37Enclosure Parts .................................................................39Dimensions ........................................................................40Wiring Diagrams ................................................................41General Purpose EncapsulatedSingle-Phase ....................................................................42

Buck-Boost Encapsulated Transformers ........................45Selection Tables................................................................48Connection Diagrams .......................................................55

Open Core and Coil Transformers...................................56Machine Tool Applications ................................................57Control ..............................................................................58Options and Fusing Guide................................................60Wiring Diagrams ...............................................................61Outlines and Dimensions..................................................62

www.midwestelectric.com Data subject to changewithout notice

Midwest Transformer Catalog2

Dry Type TransformersGeneral Information

.050 kVA-3 kVA, Single-Phase

5 kVA-25 kVA, Single-Phase

15 kVA-250 kVA, Single-Phase, TP-1 15 kVA-750 kVA, Three-Phase, TP-1

9T4 Models, 150 kVA-1000 kVA, Three-Phase, TP-1 (Incorporate

fan-assisted cooling)

600 Volts and Below

TerminationImproved termination spacing and wiring compartment roomgives greater flexibility in selecting various UL listed connec-tors for either copper or aluminum cable.

Product Number Selection Instructions1. Establish phase and frequency. Do not specify a 50Hztransformer unless absolutely necessary. 50Hz trans-formers typically cost more than 60Hz transformers.

2. Decide if the coil material should be aluminum or copper.Midwest recommends specifying aluminum whenever possible. Aluminum provides equivalent performance at a significant price savings compared with copper.

3. Determine the required temperature rise of the transformer.150°C temp rise is the standard. Lower temp rise transformers (115°C and 80°C) run cooler but will be priced higher.

4. Determine the input or primary voltage5. Determine the output or secondary voltage – the voltageneeded at the load

6. Determine the kVA load, allowing room for expansion.7. Using the facts determined in the six steps, locate thetransformer model in the listings on the following pages.

Motors X X XIncandescent Lighting X X XResistance Heating X X XMotor Generators (without solid state drives) X X XHID Lighting XInduction Heaters XWelders XUPS with optional input filtering XPLC & Solid state controls XMultiple receptacle circuits in heath care facilities XUPS without optional input filtering XProduction or assembly line equipment XSchools & Classroom facilities XSurge Supression XOffice Buildings X X X XSCR Variable Speed Drives X XCircuits with exclusive data processing equipment X X X XCritical Care facilities X X X XHospital Operating Rooms X X X XX-ray equipment X X X XComputer Installations X X X XProgrammable Controllers X X X XInstrumentation X X X XAC or DC Variable Speed DrivesRectifier outputsTemporary PowerAirborne contamins or dust-laden environments (indoor and outdoor) X

Gen

eral

Pur

pose

Gua

rd I

Gua

rd II

Gua

rd II

I

K -F

acto

r (K

=4)

K -F

acto

r (K

=13)

K -F

acto

r (K

=20)

K -F

acto

r (K

=30)

TEN

V

Transformer Selection Guide



Aluminum and CopperSingle-Phase TP-1 and Three-Phase TP-1

Advantages—Quiet performance—No-weld design – an industry first—Comprehensive factory testing assures quality—Easy, fast installation saves time—Clear, comprehensive documentation and labeling enhance safety

Key Features—Unique core and coil design makes Midwest transformersamong the quietest available

—Core and coil assemblies are mounted on rubber isolationpads to reduce noise

—Bolted coil terminations are more reliable than welded terminations, and they eliminate weld failures and problemsassociated with welding and weld splatter

—Single-piece front/back is easily removable for service—Accessible mounting flanges with front/back slotted mounting holes make installation easier

—100% factory tested for shorts and coil integrity, current and loss, voltage, impedance and noise.

—NEMA 2 powder-coat drip-proof enclosure is standard.Weathershield kit is available for conversion to NEMA 3R outdoor.

—Seismic qualified to the requirements of ASCE 7.05, IEEE-693-2005 and IBC-2006

—Copper or aluminum windings—Copper ground strap—Robust packaging with top and side protection protectsagainst shipping damage

Applications—Commercial—Industrial—Motors—Incandescent lighting—Resistance heating—Motor generators (without solid state drives)

General Purpose Transformer

General Purpose




AluminumSingle-Phase TP-1

150°C Rise NEMA 2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number

240 x 480 Volts 120/240 Volts 15 (+2, -4 2.5%) 23 320 YF171 9T83W2670240 x 480 Volts 120/240 Volts 25 (+2, -4 2.5%) 23 320 YF171 9T83W2671240 x 480 Volts 120/240 Volts 37.5 (+2, -4 2.5%) 23 320 YF171 9T83W2672240 x 480 Volts 120/240 Volts 50 (+2, -4 2.5%) 23 400 YF172 9T83W2673240 x 480 Volts 120/240 Volts 75 (+2, -4 2.5%) 23 510 YF174 9T83W2674240 x 480 Volts 120/240 Volts 100 (+2, -4 2.5%) 23 900 YF175 9T83W2675240 x 480 Volts 120/240 Volts 167 (+2, -4 2.5%) 23 1360 YF176 9T83W2676240 x 480 Volts 120/240 Volts 250 (+2, -4 2.5%) 23 1700 YF177 9T83W2677


240 x 480 Volts 120/240 Volts 15 (+2, -4 2.5%) 23 320 YF171 9T83W2670G15240 x 480 Volts 120/240 Volts 25 (+2, -4 2.5%) 23 320 YF171 9T83W2671G15240 x 480 Volts 120/240 Volts 37.5 (+2, -4 2.5%) 23 400 YF172 9T83W2672G15240 x 480 Volts 120/240 Volts 50 (+2, -4 2.5%) 23 500 YF173 9T83W2673G15240 x 480 Volts 120/240 Volts 75 (+2, -4 2.5%) 23 510 YF174 9T83W2674G15240 x 480 Volts 120/240 Volts 100 (+2, -4 2.5%) 23 900 YF175 9T83W2675G15240 x 480 Volts 120/240 Volts 167 (+2, -4 2.5%) 23 1360 YF176 9T83W2676G15



1See page 41 for wiring diagrams.

General Purpose



CopperSingle-Phase TP-1


240 x 480 Volts 120/240 Volts 15 (+2, -4 2.5%) 23 350 YF171 9T83W2570240 x 480 Volts 120/240 Volts 25 (+2, -4 2.5%) 23 350 YF171 9T83W2571240 x 480 Volts 120/240 Volts 37.5 (+2, -4 2.5%) 23 500 YF172 9T83W2572240 x 480 Volts 120/240 Volts 50 (+2, -4 2.5%) 23 520 YF173 9T83W2573240 x 480 Volts 120/240 Volts 75 (+2, -4 2.5%) 23 635 YF174 9T83W2574240 x 480 Volts 120/240 Volts 100 (+2, -4 2.5%) 23 1050 YF175 9T83W2575240 x 480 Volts 120/240 Volts 167 (+2, -4 2.5%) 23 1675 YF176 9T83W2576






General Purpose




AluminumThree-Phase TP-1

150°C Rise NEMA 2 Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number

480 Volts 208Y/120 V 15 (+2, -4 2.5%) 12 240 Y371A 9T83W3871480 Volts 208Y/120 V 30 (+2, -4 2.5%) 12 334 Y372A 9T83W3872480 Volts 208Y/120 V 45 (+2, -4 2.5%) 12 415 Y373A 9T83W3873480 Volts 208Y/120 V 75 (+2, -4 2.5%) 12 620 Y374A 9T83W3874480 Volts 208Y/120 V 112.5 (+2, -4 2.5%) 12 765 XV375 9T83W3875480 Volts 208Y/120 V 150 (+2, -4 2.5%) 12 1070 XV376 9T83W3876480 Volts 208Y/120 V 225 (+2, -4 2.5%) 12 1210 L37AA 9T83W3877480 Volts 208Y/120 V 300 (+2, -4 2.5%) 12 1470 L38AA 9T83W3878480 Volts 208Y/120 V 500 (+2, -2 2.5%) 12 3400 L39AA 9T83W3879480 Volts 208Y/120 V 750 (+2, -2 2.5%) 12 4000 L47AA 9T83W3867480 Volts 208Y/120 V 1000 (+2, -2 2.5%) 12 3250 FC68 9T40W0011


480 Volts 208Y/120 V 15 (+2, -4 2.5%) 12 240 Y371A 9T83W3871G15480 Volts 208Y/120 V 30 (+2, -4 2.5%) 12 334 XV372 9T83W3872G15480 Volts 208Y/120 V 45 (+2, -4 2.5%) 12 415 XV373 9T83W3873G15480 Volts 208Y/120 V 75 (+2, -4 2.5%) 12 620 XV374 9T83W3874G15480 Volts 208Y/120 V 112.5 (+2, -4 2.5%) 12 1070 XV376 9T83W3875G15480 Volts 208Y/120 V 150 (+2, -4 2.5%) 12 1210 L37AA 9T83W3876G15480 Volts 208Y/120 V 225 (+2, -4 2.5%) 12 1470 L38AA 9T83W3877G15480 Volts 208Y/120 V 300 (+2, -4 2.5%) 12 3400 L39AA 9T83W3878G15480 Volts 208Y/120 V 500 (+2, -2 2.5%) 12 3250 FC67 9T40W0009G51480 Volts 208Y/120 V 750 (+2, -2 2.5%) 12 3250 FC68 9T40W0010G51


480 Volts 208Y/120 V 15 (+2, -4 2.5%) 12 334 XV372 9T83W3871G80480 Volts 208Y/120 V 30 (+2, -4 2.5%) 12 415 XV373 9T83W3872G80480 Volts 208Y/120 V 45 (+2, -4 2.5%) 12 620 Y374A 9T83W3873G80480 Volts 208Y/120 V 75 (+2, -4 2.5%) 12 765 XV375 9T83W3874G80480 Volts 208Y/120 V 112.5 (+2, -4 2.5%) 12 1070 XV376 9T83W3875G80480 Volts 208Y/120 V 150 (+2, -4 2.5%) 12 1210 L37AA 9T83W3876G80480 Volts 208Y/120 V 225 (+2, -4 2.5%) 12 1470 L38AA 9T83W3877G80480 Volts 208Y/120 V 300 (+2, -4 2.5%) 12 3400 L39AA 9T83W3878G80480 Volts 208Y/120 V 500 (+2, -2 2.5%) 12 3250 FC67 9T40W0009G81480 Volts 208Y/120 V 750 (+2, -2 2.5%) 12 3250 FC68 9T40W0010G81


208 Volts 208Y/120 V 15 (+2, -4 2.5%) 12 240 XV371 9T83W3091208 Volts 208Y/120 V 30 (+2, -4 2.5%) 12 334 XV372 9T83W3092208 Volts 208Y/120 V 45 (+2, -4 2.5%) 12 415 XV373 9T83W3093208 Volts 208Y/120 V 75 (+2, -4 2.5%) 12 620 XV374 9T83W3094208 Volts 208Y/120 V 112.5 (+2, -4 2.5%) 12 765 XV375 9T83W3095208 Volts 208Y/120 V 150 (+2, -4 2.5%) 12 1070 XV376 9T83W3096208 Volts 208Y/120 V 225 (+2, -4 2.5%) 12 1590 FC79 9T83W3097208 Volts 208Y/120 V 300 (+2, -4 2.5%) 12 1820 YF378 9T83W3098208 Volts 208Y/120 V 500 (+2, -2 2.5%) 12 3400 YF379 9T83W3099

1See page 41 for wiring diagrams.Note: Product numbers beginning with 9T4 have fan-assisted cooling.

General Purpose





208 Volts 480Y/277 V 15 (+2, -4 2.5%) 12 240 XV371 9T83W3801208 Volts 480Y/277 V 30 (+2, -4 2.5%) 12 334 XV372 9T83W3802208 Volts 480Y/277 V 45 (+2, -4 2.5%) 12 415 XV373 9T83W3803208 Volts 480Y/277 V 75 (+2, -4 2.5%) 12 620 XV374 9T83W3804208 Volts 480Y/277 V 112.5 (+2, -4 2.5%) 12 765 XV375 9T83W3805208 Volts 480Y/277 V 150 (+2, -4 2.5%) 12 1070 XV376 9T83W3806208 Volts 480Y/277 V 225 (+2, -4 2.5%) 12 1590 XV377 9T83W3807208 Volts 480Y/277 V 300 (+2, -4 2.5%) 12 1820 YF378 9T83W3808208 Volts 480Y/277 V 500 (+2, -2 2.5%) 12 3400 YF379 9T83W3809




240 Volts 480Y/277 V 15 (+2, -4 2.5%) 12 240 XV371 9T83W3051240 Volts 480Y/277 V 30 (+2, -4 2.5%) 12 334 XV372 9T83W3052240 Volts 480Y/277 V 45 (+2, -4 2.5%) 12 415 XV373 9T83W3053240 Volts 480Y/277 V 75 (+2, -4 2.5%) 12 620 XV374 9T83W3054240 Volts 480Y/277 V 112.5 (+2, -4 2.5%) 12 765 XV375 9T83W3055240 Volts 480Y/277 V 150 (+2, -4 2.5%) 12 1070 XV376 9T83W3056240 Volts 480Y/277 V 225 (+2, -4 2.5%) 12 1590 XV377 9T83W3057240 Volts 480Y/277 V 300 (+2, -4 2.5%) 12 1820 YF378 9T83W3058240 Volts 480Y/277 V 500 (+2, -2 2.5%) 12 3400 YF379 9T83W 3059


480 Volts 240/120 V 15 (+2, -4 2.5%) 19 240 XV371 9T83W3841480 Volts 240/120 V 30 (+2, -4 2.5%) 19 334 XV372 9T83W3842480 Volts 240/120 V 45 (+2, -4 2.5%) 19 415 XV373 9T83W3843480 Volts 240/120 V 75 (+2, -4 2.5%) 19 620 XV374 9T83W3844480 Volts 240/120 V 112.5 (+2, -4 2.5%) 19 765 XV375 9T83W3845480 Volts 240/120 V 150 (+2, -4 2.5%) 19 1070 XV376 9T83W3846480 Volts 240/120 V 225 (+2, -4 2.5%) 19 1590 XV377 9T83W3847480 Volts 240/120 V 300 (+2, -4 2.5%) 19 1820 YF378 9T83W3848480 Volts 240/120 V 500 (+2, -2 2.5%) 19 3400 YF379 9T83W3849


480 Volts 480Y/277 V 15 (+2, -4 2.5%) 12 240 XV371 9T83W3851480 Volts 480Y/277 V 30 (+2, -4 2.5%) 12 334 XV372 9T83W3852480 Volts 480Y/277 V 45 (+2, -4 2.5%) 12 415 XV373 9T83W3853480 Volts 480Y/277 V 75 (+2, -4 2.5%) 12 620 XV374 9T83W3854480 Volts 480Y/277 V 112.5 (+2, -4 2.5%) 12 765 XV375 9T83W3855480 Volts 480Y/277 V 150 (+2, -4 2.5%) 12 1070 XV376 9T83W3856480 Volts 480Y/277 V 225 (+2, -4 2.5%) 12 1590 XV377 9T83W3857480 Volts 480Y/277 V 300 (+2, -4 2.5%) 12 1820 YF378 9T83W3858480 Volts 480Y/277 V 500 (+2, -2 2.5%) 12 3400 YF379 9T83W3859480 Volts 480Y/277 V 750 (+2, -2 2.5%) 12 3250 FC67 9T40W0410


General Purpose




CopperThree-Phase TP-1


480 Volts 240 V 15 (+2, -4 2.5%) 13 240 XV371 9T83W3881480 Volts 240 V 30 (+2, -4 2.5%) 13 334 XV372 9T83W3882480 Volts 240 V 45 (+2, -4 2.5%) 13 415 XV373 9T83W3883480 Volts 240 V 75 (+2, -4 2.5%) 13 620 XV374 9T83W3884480 Volts 240 V 112.5 (+2, -4 2.5%) 13 765 XV375 9T83W3885480 Volts 240 V 150 (+2, -4 2.5%) 13 1070 XV376 9T83W3886480 Volts 240 V 225 (+2, -4 2.5%) 13 1590 XV377 9T83W3887480 Volts 240 V 300 (+2, -4 2.5%) 13 1820 YF378 9T83W3888480 Volts 240 V 500 (+2, -2 2.5%) 13 3400 YF379 9T83W3889




480 Volts 208Y/120 V 15 (+2, -4 2.5%) 12 250 Y371C 9T83W9871480 Volts 208Y/120 V 30 (+2, -4 2.5%) 12 377 Y372C 9T83W9872480 Volts 208Y/120 V 45 (+2, -4 2.5%) 12 490 Y373C 9T83W9873480 Volts 208Y/120 V 75 (+2, -4 2.5%) 12 710 Y374C 9T83W9874480 Volts 208Y/120 V 112.5 (+2, -4 2.5%) 12 949 Y375C 9T83W9875480 Volts 208Y/120 V 150 (+2, -4 2.5%) 12 1190 Y376C 9T83W9876480 Volts 208Y/120 V 225 (+2, -4 2.5%) 12 1400 L37AA 9T83W9877480 Volts 208Y/120 V 300 (+2, -4 2.5%) 12 2480 L38AA 9T83W9878480 Volts 208Y/120 V 500 (+2, -2 2.5%) 12 4050 L39AA 9T83W9879480 Volts 208Y/120 V 750 (+2, -2 2.5%) 12 4030 FC67 9T45W0010480 Volts 208Y/120 V 1000 (+2, -2 2.5%) 12 4030 FC68 9T45W0011


480 Volts 208Y/120 V 15 (+2, -4 2.5%) 12 250 XV371 9T83W9871G15480 Volts 208Y/120 V 30 (+2, -4 2.5%) 12 377 XV372 9T83W9872G15480 Volts 208Y/120 V 45 (+2, -4 2.5%) 12 490 XV373 9T83W9873G15480 Volts 208Y/120 V 75 (+2, -4 2.5%) 12 710 XV374 9T83W9874G15480 Volts 208Y/120 V 112.5 (+2, -4 2.5%) 12 949 XV375 9T83W9875G15480 Volts 208Y/120 V 150 (+2, -4 2.5%) 12 1400 L37AA 9T83W9876G15480 Volts 208Y/120 V 225 (+2, -4 2.5%) 12 2480 L38AA 9T83W9877G15480 Volts 208Y/120 V 300 (+2, -4 2.5%) 12 4050 L39AA 9T83W9878G15480 Volts 208Y/120 V 750 (+2, -2 2.5%) 12 4030 FC67 9T45W0010G51


480 Volts 208Y/120 V 15 (+2, -4 2.5%) 12 377 XV372 9T83W9871G80480 Volts 208Y/120 V 30 (+2, -4 2.5%) 12 490 XV373 9T83W9872G80480 Volts 208Y/120 V 45 (+2, -4 2.5%) 12 710 XV374 9T83W9873G80480 Volts 208Y/120 V 75 (+2, -4 2.5%) 12 949 XV375 9T83W9874G80480 Volts 208Y/120 V 112.5 (+2, -4 2.5%) 12 1190 XV376 9T83W9875G80480 Volts 208Y/120 V 150 (+2, -4 2.5%) 12 1400 L37AA 9T83W9876G80480 Volts 208Y/120 V 225 (+2, -4 2.5%) 12 2480 L38AA 9T83W9877G80480 Volts 208Y/120 V 300 (+2, -4 2.5%) 12 4050 L39AA 9T83W9878G80480 Volts 208Y/120 V 500 (+2, -2 2.5%) 12 4030 FC67 9T45W0009G81480 Volts 208Y/120 V 750 (+2, -2 2.5%) 12 4030 FC68 9T45W0010G81


General Purpose




K=4 150°C Rise NEMA 2 Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number

480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 240 XV371 9T83W3461G03480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 334 XK372 9T83W3462G03480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3463G03480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 765 XV375 9T83W3464G03480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1070 XV376 9T83W3465G03480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1590 XV377 9T83W3466G03480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1470 L38AA 9T64W3877G03480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3400 YF379 9T64W3878G03480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 3250 FC68 9T44W0009G03480 Volts Delta 208Y/120 Volts 750 (+2, -2 2.5%) 12 3250 FC68 9T44W0010G03


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 240 XV371 9T83W3461G13480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 415 XV373 9T83W3462G13480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3463G13480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 765 XV375 9T83W3464G13480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1070 XV376 9T83W3465G13480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1470 L38AA 9T64W3876G13480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 3400 YF379 9T64W3877G13480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3400 YF379 9T64W3878G13480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 3250 FC68 9T44W0009G53


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 334 XV372 9T64W3871G83480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 415 XV373 9T83W3462G83480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3463G83480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1070 XV376 9T64W3874G83480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1590 XV377 9T64W3875G83480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1470 L38AA 9T64W3876G83480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1020 FC78 9T44W0007G83480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 1590 FC79 9T44W0008G83480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 3250 FC68 9T44W0009G83

1See page 41 for wiring diagrams. Note: Product numbers beginning with 9T4 have fan-assisted cooling.

Product DescriptionThese Midwest transformers have passed the UL K-factor test-ing program. K-factor is a standardized way to indicate the abili-ty of a transformer to withstand harmonics. These units shall notexceed rated winding temperature rise at full load and rated K-factor. Neutrals are capable of handling 200% of rated secondary phase current.Full-width copper electrostatic shielding is standard on allMidwest K-factor rated transformers. Effective coupling capacitance is 30 pf. Common mode noise attenuation averages120 dB, and transverse mode noise attenuation averages 30 dB.

ApplicationFor commercial applications with significance nonlinear electron-ic loading, use K=4 for systems with 50% connected nonlinearelectronic loads; K=13 for systems with 100% connected nonlin-ear electronic loads.Higher K-factor rated units are available for unique applications.See the Transformer Selection Guide on page 2 for more information on how to select the correct K-factor transformer for your application.

K-Factor Transformer

K-Factor





K=13 150°C Rise NEMA 2 Input Output Wiring Approx. Net Frame Product Voltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number

480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 240 XV371 9T83W3471G03480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 334 XK372 9T83W3472G03480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3473G03480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 765 XV375 9T83W3474G03480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1070 XV376 9T83W3475G03480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1590 XV377 9T83W3476G03480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1470 L38AA 9T61W3877G03480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3400 YF379 9T61W3878G03480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 3250 FC68 9T41W0009G03


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 240 XV371 9T83W3471G13480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 415 XV373 9T83W3472G13480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3473G13480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 765 XV375 9T83W3474G13480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1590 XV377 9T61W3875G13480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1470 L38AA 9T61W3876G13480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 3400 YF379 9T61W3877G13480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3250 FC68 9T41W0008G53


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 334 XK372 9T61W3871G83480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 620 XV374 9T61W3872G83480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3473G83480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1070 XV376 9T61W3874G83480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1590 XV377 9T61W3875G83480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1470 L38AA 9T61W3876G83480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1590 FC79 9T41W0007G83480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3250 FC68 9T41W0008G83


K-Factor





480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 240 XV371 9T83W3481G03480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 415 XV373 9T83W3482G03480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3483G03480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 765 XV375 9T62W3874G03480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1590 XV377 9T62W3875G03480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1470 L38AA 9T62W3876G03480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 3400 YF379 9T62W3877G03480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 1590 FC79 9T42W0008G03


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 334 XK372 9T62W3871G13480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 415 XV373 9T83W3482G13480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3483G13480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1070 XV376 9T62W3874G13480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1590 XV377 9T62W3875G13480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1470 L38AA 9T62W3876G13480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1590 FC79 9T42W0007G53480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3250 FC68 9T42W0008G53


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 334 XK372 9T62W3871G83480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 620 XV374 9T62W3872G83480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3483G83480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1070 XV376 9T62W3874G83480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1590 XV377 9T62W3875G83480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1020 FC78 9T42W0006G83480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 3250 FC68 9T42W0007G83480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3250 FC68 9T42W0008G83


K-Factor






480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 240 XV371 9T83W3491G03480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 415 XV373 9T83W3492G03480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3493G03480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 765 XV375 9T83W3494G03480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1590 XV377 9T63W3875G03480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1470 L38AA 9T63W3876G03480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1590 FC79 9T43W0007G03480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3250 FC68 9T43W0008G03


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 334 XK372 9T63W3871G13480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 415 XV373 9T83W3492G13480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3493G13480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1070 XV376 9T63W3874G13480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1590 XV377 9T63W3875G13480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1470 L38AA 9T63W3876G13480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 3250 FC68 9T43W0007G53


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 334 XK372 9T63W3871G83480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 620 XV374 9T63W3872G83480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 765 XV375 9T63W3873G83480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1020 FC78 9T43W0006G83


K-Factor





480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 250 XV371 9T83W9461G03480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 377 XV372 9T64W9872G03480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9463G03480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 949 XV375 9T83W9464G03480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1190 XV376 9T83W9465G03480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T64W9876G03480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 2480 L38AA 9T64W9877G03480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 2480 L38AA 9T64W9878G03480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 4030 FC68 9T49W0009G03480 Volts Delta 208Y/120 Volts 750 (+2, -2 2.5%) 12 4030 FC68 9T49W0010G03


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 250 XV371 9T83W9461G13480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 490 XV373 9T83W9462G13480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9463G13480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 949 XV375 9T83W9464G13480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1190 XV376 9T83W9465G13480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T64W9876G13480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 2480 L38AA 9T64W9877G13480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 4030 FC68 9T49W0009G53480 Volts Delta 208Y/120 Volts 750 (+2, -2 2.5%) 12 4030 FC68 9T49W0010G53


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T64W9871G83480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 490 XV373 9T64W9872G83480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9463G83480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1190 XV376 9T83W9464G83480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1400 L37AA 9T64W9875G83480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T64W9876G83480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1160 FC78 9T49W0007G83480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 1780 FC79 9T49W0008G83480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 4030 FC68 9T49W0009G83


K-Factor






480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 250 XV371 9T61W9871G03480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 377 XV372 9T61W9872G03480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9473G03480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 949 XV375 9T83W9474G03480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1190 XV376 9T83W9475G03480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T61W9876G03480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 2480 L38AA 9T61W9877G03480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 4050 YF379 9T61W9878G03480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 4030 FC68 9T46W0009G03


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T61W9871G13480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 490 XV373 9T83W9472G13480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9473G13480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 949 XV375 9T83W9474G13480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1710 XV377 9T61W9875G13480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T61W9876G13480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 2480 L38AA 9T61W9877G13480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 1780 FC79 9T46W0008G53480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 4030 FC68 9T46W0009G53


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T61W9871G83480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 710 XV374 9T61W9872G83480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9473G83480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1190 XV376 9T61W9874G83480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1400 L37AA 9T61W9875G83480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 2480 L38AA 9T61W9876G83480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1780 FC79 9T46W0007G83480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 4030 FC68 9T46W0008G83


K-Factor





480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T62W9871G03480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 490 XV373 9T83W9482G03480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9483G03480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 949 XV375 9T83W9484G03480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1710 XV377 9T62W9875G03480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T62W9876G03480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 2480 L38AA 9T62W9877G03480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 1780 FC79 9T47W0008G03


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T62W9875G13480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 490 XV373 9T83W9482G13480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9483G13480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1190 XV376 9T83W9484G13480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1400 L37AA 9T62W9875G13480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T62W9876G13480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 2480 L38AA 9T62W9877G13480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 4030 FC68 9T47W0008G53


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T62W9871G83480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 710 XV374 9T62W9872G83480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T62W9873G83480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1190 XV376 9T62W9874G83480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1710 XV377 9T62W9875G83480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 2480 L38AA 9T62W9876G83


K-Factor






480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T63W9871G03480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 490 XV373 9T83W9492G03480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9493G03480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 949 XV375 9T83W9494G03480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1710 XV377 9T63W9875G03480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T63W9876G03480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 2480 L38AA 9T63W9877G03


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T63W9871G13480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 490 XV373 9T63W9872G13480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9493G13480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1190 XV376 9T83W9494G13480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1400 L37AA 9T63W9875G13480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1400 L37AA 9T63W9876G13480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1780 FC79 9T48W0007G53


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T63W9871G83480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 710 XV374 9T63W9872G83480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 949 XV375 9T63W9873G83480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 1190 XV376 9T63W9874G83480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 2480 L38AA 9T63W9876G83


K-Factor




K=4 150°C RiseInput Output Wiring Approx. Net Frame Product Voltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number

480 208Y/120 15 (+2, -4 2.5%) 12 240 XV371 9T64W3871G53480 208Y/120 30 (+2, -4 2.5%) 12 334 XK372 9T64W3872G53480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T64W3873G53480 208Y/120 75 (+2, -4 2.5%) 12 765 XV375 9T64W3874G53480 208Y/120 112.5 (+2, -4 2.5%) 12 1070 XV376 9T64W3875G53480 208Y/120 150 (+2, -4 2.5%) 12 1590 XV377 9T64W3876G53480 208Y/120 225 (+2, -4 2.5%) 12 1820 YF378 9T64W3877G53480 208Y/120 300 (+2, -4 2.5%) 12 3400 YF379 9T64W3878G53


480 208Y/120 15 (+2, -4 2.5%) 12 240 XV371 9T64W3871G23480 208Y/120 30 (+2, -4 2.5%) 12 415 XV373 9T64W3872G23480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T64W3873G23480 208Y/120 75 (+2, -4 2.5%) 12 765 XV375 9T64W3874G23480 208Y/120 112.5 (+2, -4 2.5%) 12 1070 XV376 9T64W3875G23480 208Y/120 150 (+2, -4 2.5%) 12 1590 XV377 9T64W3876G23480 208Y/120 225 (+2, -4 2.5%) 12 3400 YF379 9T64W3877G23480 208Y/120 300 (+2, -4 2.5%) 12 3400 YF379 9T64W3878G23


480 208Y/120 15 (+2, -4 2.5%) 12480 208Y/120 30 (+2, -4 2.5%) 12 415 XV373 9T64W3872G93480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T64W3873G93480 208Y/120 75 (+2, -4 2.5%) 12 1070 XV376 9T64W3874G93480 208Y/120 112.5 (+2, -4 2.5%) 12 1590 XV377 9T64W3875G93480 208Y/120 150 (+2, -4 2.5%) 12 1820 YF378 9T64W3876G93


480 208Y/120 15 (+2, -4 2.5%) 12 240 XV371 9T61W3871G53480 208Y/120 30 (+2, -4 2.5%) 12 334 XK372 9T61W3872G53480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T61W3873G53480 208Y/120 75 (+2, -4 2.5%) 12 765 XV375 9T61W3874G53480 208Y/120 112.5 (+2, -4 2.5%) 12 1070 XV376 9T61W3875G53480 208Y/120 150 (+2, -4 2.5%) 12 1590 XV377 9T61W3876G53480 208Y/120 225 (+2, -4 2.5%) 12 3400 YF379 9T61W3877G53480 208Y/120 300 (+2, -4 2.5%) 12 3400 YF379 9T61W3878G53


480 208Y/120 15 (+2, -4 2.5%) 12 240 XV371 9T61W3871G23480 208Y/120 30 (+2, -4 2.5%) 12 415 XV373 9T61W3872G23480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T61W3873G23480 208Y/120 75 (+2, -4 2.5%) 12 765 XV375 9T61W3874G23480 208Y/120 112.5 (+2, -4 2.5%) 12 1590 XV377 9T61W3875G23480 208Y/120 150 (+2, -4 2.5%) 12 1820 YF378 9T61W3876G23480 208Y/120 225 (+2, -4 2.5%) 12 3400 YF379 9T61W3877G23


480 208Y/120 15 (+2, -4 2.5%) 12480 208Y/120 30 (+2, -4 2.5%) 12480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T61W3873G93480 208Y/120 75 (+2, -4 2.5%) 12 1070 XV376 9T61W3874G93480 208Y/120 112.5 (+2, -4 2.5%) 12 1590 XV377 9T61W3875G93


K-Factor Low Noise





K=20 150°C Rise Input Output Wiring Approx. Net Frame Product Voltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number

480 208Y/120 15 (+2, -4 2.5%) 12 240 XV371 9T62W3871G53480 208Y/120 30 (+2, -4 2.5%) 12 415 XV373 9T62W3872G53480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T62W3873G53480 208Y/120 75 (+2, -4 2.5%) 12 765 XV375 9T62W3874G53480 208Y/120 112.5 (+2, -4 2.5%) 12 1590 XV377 9T62W3875G53480 208Y/120 150 (+2, -4 2.5%) 12 1590 XV377 9T62W3876G53480 208Y/120 225 (+2, -4 2.5%) 12 3400 YF379 9T62W3877G53


480 208Y/120 15 (+2, -4 2.5%) 12480 208Y/120 30 (+2, -4 2.5%) 12 415 XV373 9T62W3872G23480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T62W3873G23480 208Y/120 75 (+2, -4 2.5%) 12 1070 XV376 9T62W3874G23480 208Y/120 112.5 (+2, -4 2.5%) 12 1590 XV377 9T62W3875G23




480 208Y/120 15 (+2, -4 2.5%) 12 240 XV371 9T63W3871G53480 208Y/120 30 (+2, -4 2.5%) 12 415 XV373 9T63W3872G53480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T63W3873G53480 208Y/120 75 (+2, -4 2.5%) 12 765 XV375 9T63W3874G53480 208Y/120 112.5 (+2, -4 2.5%) 12 1590 XV377 9T63W3875G53480 208Y/120 150 (+2, -4 2.5%) 12 1820 YF378 9T63W3876G53


480 208Y/120 15 (+2, -4 2.5%) 12480 208Y/120 30 (+2, -4 2.5%) 12 415 XV373 9T63W3872G23480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T63W3873G23480 208Y/120 75 (+2, -4 2.5%) 12 1070 XV376 9T63W3874G23480 208Y/120 112.5 (+2, -4 2.5%) 12 1590 XV377 9T63W3875G23


K-Factor Low Noise




K = 4 150°C RiseInput Output Wiring Approx. Net Frame Product Voltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number





480 208Y/120 15 (+2, -4 2.5%) 12 377 XV372 9T64W9871G93480 208Y/120 30 (+2, -4 2.5%) 12 490 XV373 9T64W9872G93480 208Y/120 45 (+2, -4 2.5%) 12 710 XV374 9T64W9873G93480 208Y/120 75 (+2, -4 2.5%) 12 1190 XV376 9T64W9874G93480 208Y/120 112.5 (+2, -4 2.5%) 12 1710 XV377 9T64W9875G93480 208Y/120 150 (+2, -4 2.5%) 12 1400 L37AA 9T64W9876G93480 208Y/120 225 (+2, -4 2.5%) 12


480 208Y/120 15 (+2, -4 2.5%) 12 250 XV371 9T61W9871G53480 208Y/120 30 (+2, -4 2.5%) 12 490 XV373 9T61W9872G53480 208Y/120 45 (+2, -4 2.5%) 12 710 XV374 9T61W9873G53480 208Y/120 75 (+2, -4 2.5%) 12 949 XV375 9T61W9874G53480 208Y/120 112.5 (+2, -4 2.5%) 12 1190 XV376 9T61W9875G53480 208Y/120 150 (+2, -4 2.5%) 12 1710 XV377 9T61W9876G53480 208Y/120 300 (+2, -4 2.5%) 12 4050 YF379 9T61W9878G53


480 208Y/120 15 (+2, -4 2.5%) 12 377 XV372 9T61W9871G23480 208Y/120 30 (+2, -4 2.5%) 12 490 XV373 9T61W9872G23480 208Y/120 45 (+2, -4 2.5%) 12 710 XV374 9T61W9873G23480 208Y/120 75 (+2, -4 2.5%) 12 949 XV375 9T61W9874G23480 208Y/120 112.5 (+2, -4 2.5%) 12 1190 XV376 9T61W9875G23480 208Y/120 150 (+2, -4 2.5%) 12 1710 XV377 9T61W9876G23


480 208Y/120 15 (+2, -4 2.5%) 12 377 XV372 9T61W9871G93480 208Y/120 30 (+2, -4 2.5%) 12480 208Y/120 45 (+2, -4 2.5%) 12 710 XV374 9T61W9873G93480 208Y/120 75 (+2, -4 2.5%) 12 1190 XV376 9T61W9874G93480 208Y/120 112.5 (+2, -4 2.5%) 12 1710 XV377 9T61W9875G93480 208Y/120 150 (+2, -4 2.5%) 12


K-Factor Low Noise






480 208Y/120 15 (+2, -4 2.5%) 12 377 XV372 9T62W9871G53480 208Y/120 30 (+2, -4 2.5%) 12 490 XV373 9T62W9872G53480 208Y/120 45 (+2, -4 2.5%) 12 710 XV374 9T62W9873G53480 208Y/120 75 (+2, -4 2.5%) 12 949 XV375 9T62W9874G53480 208Y/120 112.5 (+2, -4 2.5%) 12 1710 XV377 9T62W9875G53480 208Y/120 150 (+2, -4 2.5%) 12 1710 XV377 9T62W9876G53


480 208Y/120 15 (+2, -4 2.5%) 12 377 XV372 9T62W9871G23480 208Y/120 30 (+2, -4 2.5%) 12 490 XV373 9T62W9872G23480 208Y/120 45 (+2, -4 2.5%) 12 710 XV374 9T62W9873G23480 208Y/120 75 (+2, -4 2.5%) 12 1190 XV376 9T62W9874G23480 208Y/120 112.5 (+2, -4 2.5%) 12 1710 XV377 9T62W9875G23480 208Y/120 150 (+2, -4 2.5%) 12 1400 L37AA 9T62W9876G23




480 208Y/120 15 (+2, -4 2.5%) 12480 208Y/120 30 (+2, -4 2.5%) 12 490 XV373 9T63W9872G53480 208Y/120 45 (+2, -4 2.5%) 12 710 XV374 9T63W9873G53480 208Y/120 75 (+2, -4 2.5%) 12 949 XV375 9T63W9874G53480 208Y/120 112.5 (+2, -4 2.5%) 12 1710 XV377 9T63W9875G53480 208Y/120 150 (+2, -4 2.5%) 12 1710 XV377 9T63W9876G53




K-Factor Low Noise




150°C Rise NEMA 2 Input Output Wiring Approx Net Frame Product Voltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number

480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 240 XV371 9T83W3141480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 334 Y372A 9T83W3142480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 415 XV373 9T83W3143480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 620 XV374 9T83W3144480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 765 XV375 9T83W3145480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1070 XV376 9T83W3146480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1590 XV377 9T83W3147480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 1820 YF378 9T83W3148480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 3400 YF379 9T83W3149


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 240 XV371 9T83W3141G15480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 334 XV372 9T83W3142G15480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 415 XV373 9T83W3143G15480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 620 XV374 9T83W3144G15480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1070 XV376 9T83W3145G15480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1590 XV377 9T83W3146G15480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1820 YF378 9T83W3147G15480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 334 XV372 9T83W3141G80480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 415 XV373 9T83W3142G80480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 620 XV374 9T83W3143G80480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 765 XV375 9T83W3144G80480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1820 YF378 9T83W3147G80480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 765 XV375 9T83W3874G90


Product DescriptionThese low noise transformers are designed to operate atreduced noise levels. The vibrations within the magnetic steelcore are greatly reduced, thus lowering the humming of thetransformer from 3 to 5 dB less than NEMA/ANSI standards.Available in Aluminum or Copper windings, with either a150°C, 115°C or 80°C rise.

ApplicationLow noise transformers are ideal when quiet operation isrequired such as near offices, in school buildings, or hospitals.Although they are inherently quieter, installation can greatly influence their noise level and therefore care should be takenin following acoustical principles as well as proper installation procedures. Closets and corners should be avoided as theyact as megaphones by seemingly increasing noise levels. Low Noise Transformer (front panel removed)

Low Noise






480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 250 XV371 9T83W9141480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 377 XV372 9T83W9142480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 490 XV373 9T83W9143480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 710 XV374 9T83W9144480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 949 XV375 9T83W9145480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1190 XV376 9T83W9146480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 1710 XV377 9T83W9147480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 3150 YF378 9T83W9148480 Volts Delta 208Y/120 Volts 500 (+2, -2 2.5%) 12 4050 YF379 9T83W9149


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 250 XV371 9T83W9141G15480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 377 XV372 9T83W9142G15480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 490 XV373 9T83W9143G15480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 710 XV374 9T83W9144G15480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 949 XV375 9T83W9145G15480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12 1710 XV377 9T83W9146G15480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 3150 YF378 9T83W9147G15480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 710 XV374 9T83W9874G20480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 949 XV375 9T83W9875G20480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12 4050 L39AA 9T83W9878G20


480 Volts Delta 208Y/120 Volts 15 (+2, -4 2.5%) 12 377 XV372 9T83W9141G80480 Volts Delta 208Y/120 Volts 30 (+2, -4 2.5%) 12 490 XV373 9T83W9142G80480 Volts Delta 208Y/120 Volts 45 (+2, -4 2.5%) 12 710 XV374 9T83W9143G80480 Volts Delta 208Y/120 Volts 75 (+2, -4 2.5%) 12 949 XV375 9T83W9144G80480 Volts Delta 208Y/120 Volts 112.5 (+2, -4 2.5%) 12 1190 XV376 9T83W9145G80480 Volts Delta 208Y/120 Volts 150 (+2, -4 2.5%) 12480 Volts Delta 208Y/120 Volts 225 (+2, -4 2.5%) 12 3150 YF378 9T83W9147G80480 Volts Delta 208Y/120 Volts 300 (+2, -4 2.5%) 12


Low Noise



Guard I noise isolation transformers provide common modenoise attenuation plus transverse mode noise attenuation forprotection of sensitive electronic equipment.

Key Features—Grounded copper electrostatic shield between primary and secondary windings

—120dB common mode noise rejection—30dB transverse mode noise rejection—Compliance with ANSI and NEMA standards—Sound levels below NEMA ST-20 limits —UL Listed —NEMA 2 enclosure

Applications—Schools and colleges —Large computer installations —Small commercial offices —Hospitals —X-ray rooms —Electrical laboratories

Guard I Transformer

Noise Isolation — Guard I (Electrostatic Shield)





150°C Rise NEMA 2Input Output Wiring Approx Net Frame Product Voltage Voltage kVA Taps Diagram No.1 Weight (Lbs) Size Number

480 208Y/120 15 (+2, -4 2.5%) 12 240 XV371 9T83W3871G03480 208Y/120 30 (+2, -4 2.5%) 12 334 XV372 9T83W3872G03480 208Y/120 45 (+2, -4 2.5%) 12 415 XV373 9T83W3873G03480 208Y/120 75 (+2, -4 2.5%) 12 620 XV374 9T83W3874G03480 208Y/120 112.5 (+2, -4 2.5%) 12 765 XV375 9T83W3875G03480 208Y/120 150 (+2, -4 2.5%) 12 1070 XV376 9T83W3876G03480 208Y/120 225 (+2, -4 2.5%) 12 1590 XV377 9T83W3877G03480 208Y/120 300 (+2, -4 2.5%) 12 1820 YF378 9T83W3878G03480 208Y/120 500 (+2, -2 2.5%) 12 3400 YF379 9T83W3879G03480 208Y/120 750 (+2, -2 2.5%) 12 3250 FC67 9T40W0010G03480 208Y/120 1000 (+2, -2 2.5%) 12 3250 FC68 9T40W0011G03


480 208Y/120 15 (+2, -4 2.5%) 12 240 XV371 9T83W3871G13480 208Y/120 30 (+2, -4 2.5%) 12 334 XV372 9T83W3872G13480 208Y/120 45 (+2, -4 2.5%) 12 415 XV373 9T83W3873G13480 208Y/120 75 (+2, -4 2.5%) 12 620 XV374 9T83W3874G13480 208Y/120 112.5 (+2, -4 2.5%) 12 1070 XV376 9T83W3875G13480 208Y/120 150 (+2, -4 2.5%) 12 1590 XV377 9T83W3876G13480 208Y/120 225 (+2, -4 2.5%) 12 1820 YF378 9T83W3877G13480 208Y/120 300 (+2, -4 2.5%) 12 3400 L39AA 9T83W3878G13480 208Y/120 500 (+2, -2 2.5%) 12 3250 FC67 9T40W0009G53


480 208Y/120 15 (+2, -4 2.5%) 12 334 XV372 9T83W3871G83480 208Y/120 30 (+2, -4 2.5%) 12 415 XV373 9T83W3872G83480 208Y/120 45 (+2, -4 2.5%) 12 620 XV374 9T83W3873G83480 208Y/120 75 (+2, -4 2.5%) 12 765 XV375 9T83W3874G83480 208Y/120 112.5 (+2, -4 2.5%) 12 1590 XV377 9T83W3875G83480 208Y/120 150 (+2, -4 2.5%) 12 850 FC77 9T40W0006G83480 208Y/120 225 (+2, -4 2.5%) 12 1820 YF378 9T83W3877G83480 208Y/120 300 (+2, -4 2.5%) 12 3400 L39AA 9T83W3878G83

1See page 41 for wiring diagrams.Note: Product numbers beginning with 9T4 have fan-assisted cooling.






480 208Y/120 15 (+2, -4 2.5%) 12 250 XV371 9T83W9871G03480 208Y/120 30 (+2, -4 2.5%) 12 377 XV372 9T83W9872G03480 208Y/120 45 (+2, -4 2.5%) 12 490 XV373 9T83W9873G03480 208Y/120 75 (+2, -4 2.5%) 12 710 XV374 9T83W9874G03480 208Y/120 112.5 (+2, -4 2.5%) 12 949 XV375 9T83W9875G03480 208Y/120 150 (+2, -4 2.5%) 12 1190 XV376 9T83W9876G03480 208Y/120 225 (+2, -4 2.5%) 12 1710 XV377 9T83W9877G03480 208Y/120 300 (+2, -4 2.5%) 12 3150 YF378 9T83W9878G03480 208Y/120 500 (+2, -2 2.5%) 12 4050 YF379 9T83W9879G03480 208Y/120 750 (+2, -2 2.5%) 12 4030 FC67 9T45W0010G03480 208Y/120 1000 (+2, -2 2.5%) 12 4030 FC68 9T45W0011G03


480 208Y/120 15 (+2, -4 2.5%) 12 250 XV371 9T83W9871G13480 208Y/120 30 (+2, -4 2.5%) 12 377 XV372 9T83W9872G13480 208Y/120 45 (+2, -4 2.5%) 12 490 XV373 9T83W9873G13480 208Y/120 75 (+2, -4 2.5%) 12 710 XV374 9T83W9874G13480 208Y/120 112.5 (+2, -4 2.5%) 12 949 XV375 9T83W9875G13480 208Y/120 150 (+2, -4 2.5%) 12 1710 XV377 9T83W9876G13480 208Y/120 225 (+2, -4 2.5%) 12 3150 YF378 9T83W9877G13480 208Y/120 300 (+2, -4 2.5%) 12 4050 L39AA 9T83W9878G13


480 208Y/120 15 (+2, -4 2.5%) 12 377 XV372 9T83W9871G83480 208Y/120 30 (+2, -4 2.5%) 12 490 XV373 9T83W9872G83480 208Y/120 45 (+2, -4 2.5%) 12 710 XV374 9T83W9873G83480 208Y/120 75 (+2, -4 2.5%) 12 949 XV375 9T83W9874G83480 208Y/120 112.5 (+2, -4 2.5%) 12 1190 XV376 9T83W9875G83480 208Y/120 150 (+2, -4 2.5%) 12 1710 XV377 9T83W9876G83480 208Y/120 225 (+2, -4 2.5%) 12 3150 YF378 9T83W9877G83480 208Y/120 300 (+2, -4 2.5%) 12 4050 L39AA 9T83W9878G83






Guard II noise isolation transformers provide common modenoise attenuation plus an enhanced level of transverse modenoise attenuation for increased protection of sensitive elec-tronic equipment.

Key Features—Grounded copper electrostatic shield between primary and secondary windings

—Noise suppressors and spike/surge suppressors —120dB common mode noise rejection—60dB transverse mode noise rejection—Compliance with ANSI and NEMA standards—Sound levels below NEMA ST-20 limits —UL Listed —NEMA 2 enclosure

Applications—Schools and colleges —Large computer installations —Small commercial offices —Motor installations —Process controllers —Hospitals —X-ray rooms —Electrical laboratories —High lightning strike areas

Guard II Transformer

Guard II Transformer, (front panel removed)

Noise Isolation — Guard II (Electrostatic Shield Plus Spike/Surge Protection)




150°C RiseInput Output Approx Net Frame Product Voltage Voltage kVA Taps Weight (Lbs) Size Number

480 208Y/120 15 (+2, -4 2.5%) 260 XV371 9T86W3871G03480 208Y/120 30 (+2, -4 2.5%) 370 XV372 9T86W3872G03480 208Y/120 45 (+2, -4 2.5%) 460 XV373 9T86W3873G03480 208Y/120 75 (+2, -4 2.5%) 680 XV374 9T86W3874G03480 208Y/120 112.5 (+2, -4 2.5%) 830 XV375 9T86W3875G03


480 208Y/120 15 (+2, -4 2.5%) 260 XV371 9T86W3871G13480 208Y/120 30 (+2, -4 2.5%) 370 XV372 9T86W3872G13480 208Y/120 45 (+2, -4 2.5%) 460 XV373 9T86W3873G13480 208Y/120 75 (+2, -4 2.5%) 680 XV374 9T86W3874G13









Noise Isolation — Guard II (Electrostatic Shield PlusSpike/Surge Protection)















Noise Isolation — Guard II (Electrostatic Shield PlusSpike/Surge Protection)



115°C Rise NEMA 2Input Output Approx Net Product Voltage Voltage kVA Temp Rise Phase Shift Weight (Lbs) Frame Size Number

480 208Y/120 15 115 0˚ 315 H371C 9T96W9871G13480 208Y/120 30 115 0˚ 550 H372C 9T96W9872G13480 208Y/120 45 115 0˚ 550 H372C 9T96W9873G13480 208Y/120 75 115 0˚ 1050 H374C 9T96W9874G13480 208Y/120 112.5 115 0˚ 1975 H375C 9T96W9875G13480 208Y/120 150 115 0˚ 2000 H376C 9T96W9876G13

150°C Rise NEMA 2Input Output Approx Net Product Voltage Voltage kVA Temp Rise Phase Shift Weight (Lbs) Frame Size Number

480 208Y/120 15 150 -30˚ 315 H371C 9T97W9871G03480 208Y/120 30 150 -30˚ 550 H372C 9T97W9872G03480 208Y/120 45 150 -30˚ 640 H373C 9T97W9873G03480 208Y/120 75 150 -30˚ 1050 H374C 9T97W9874G03480 208Y/120 112.5 150 -30˚ 1975 H375C 9T97W9875G03480 208Y/120 150 150 -30˚ 2000 H376C 9T97W9876G03480 208Y/120 225 150 -30˚ H377C 9T97W9877G03480 208Y/120 300 150 -30˚ 9T97W9878G03


Harmonic Mitigating — Guard III




Copper (Also available with Aluminum Windings)Three-Phase CSL-3NEMA Premium™

ApplicationsLEED® buildings, schools, university buildings, stadiums, government buildings, healthcare and commercial buildings.

Maximum No Load Loss (Watts)kVA TP-1 QL Ultra Efficient % Change15 92 49 -47%30 152 85 -44%45 191 97 -50%75 320 142 -56%112 417 200 -52%150 421 203 -52%225 715 313 -56%300 751 330 -56%

Energy Efficiency TP-1 vs. CSL-315kVA 30kVA 45kVA 75kVA 112.5kVA 150kVA 225kVA 300kVA

TP-1 97.0% 97.5% 97.7% 98.0% 98.2% 98.3% 98.5% 98.6%Efficient (CSL-3) 97.90% 98.25% 98.39% 98.60% 98.74% 98.81% 98.75% 99.02%

150°C Rise NEMA 2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Taps Diagram No.1 Weight (Lbs.) Size Number

480 208Y/120 15 (+2, -4 2.5%) 12 240 S31AC 9T73W9871480 208Y/120 30 (+2, -4 2.5%) 12 360 S32AC 9T73W9872480 208Y/120 45 (+2, -4 2.5%) 12 460 S33AC 9T73W9873480 208Y/120 75 (+2, -4 2.5%) 12 690 S34AC 9T73W9874480 208Y/120 112.5 (+2, -4 2.5%) 12 850 S35AC 9T73W9875480 208Y/120 150 (+2, -4 2.5%) 12 1190 S36AC 9T73W9876480 208Y/120 225 (+2, -4 2.5%) 12 1710 S37AC 9T73W9877480 208Y/120 300 (+2, -4 2.5%) 12 3170 S38AC 9T73W9878

115°C Rise NEMA 2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Taps Diagram No.1 Weight (Lbs.) Size Number

480 208Y/120 15 (+2, -4 2.5%) 12 240 S31AC 9T73W9871G15480 208Y/120 30 (+2, -4 2.5%) 12 360 S32AC 9T73W9872G15480 208Y/120 45 (+2, -4 2.5%) 12 460 S33AC 9T73W9873G15480 208Y/120 75 (+2, -4 2.5%) 12 690 S34AC 9T73W9874G15480 208Y/120 112.5 (+2, -4 2.5%) 12 850 S35AC 9T73W9875G15480 208Y/120 150 (+2, -4 2.5%) 12 1710 S37AC 9T73W9876G15480 208Y/120 225 (+2, -4 2.5%) 12 3170 S38AC 9T73W9877G15


Ultra Energy Efficient



K=4 150°C Rise NEMA 2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Taps Diagram No.1 Weight (Lbs.) Size Number

480 208Y/120 15 (+2, -4 2.5%) 12 360 S32AC 9T73W9461G03480 208Y/120 30 (+2, -4 2.5%) 12 360 S32AC 9T73W9462G03480 208Y/120 45 (+2, -4 2.5%) 12 690 S34AC 9T73W9463G03480 208Y/120 75 (+2, -4 2.5%) 12 850 S35AC 9T73W9464G03480 208Y/120 112.5 (+2, -4 2.5%) 12 1190 S36AC 9T73W9465G03480 208Y/120 150 (+2, -4 2.5%) 12 1710 S37AC 9T73W9466G03




480 208Y/120 15 (+2, -4 2.5%) 12 360 S32AC 9T73W9461G83480 208Y/120 30 (+2, -4 2.5%) 12 460 S33AC 9T73W9462G83480 208Y/120 45 (+2, -4 2.5%) 12 690 S34AC 9T73W9463G83480 208Y/120 75 (+2, -4 2.5%) 12 9T73W9464G83480 208Y/120 112.5 (+2, -4 2.5%) 12 1710 S37AC 9T73W9465G83480 208Y/120 150 (+2, -4 2.5%) 12 3170 S38AC 9T73W9466G83






480 208Y/120 15 (+2, -4 2.5%) 12 9T73W9471G83480 208Y/120 30 (+2, -4 2.5%) 12 9T73W9472G83480 208Y/120 45 (+2, -4 2.5%) 12 9T73W9473G83480 208Y/120 75 (+2, -4 2.5%) 12 1190 S36AC 9T73W9474G83480 208Y/120 112.5 (+2, -4 2.5%) 12 9T73W9475G83480 208Y/120 150 (+2, -4 2.5%) 12 9T73W9476G83


Copper (Also available with Aluminum Windings)Three-Phase NEMA Premium™

Ultra Energy Efficient K-Factor




Copper (Also available with Aluminum Windings)Three-Phase NEMA Premium™

0° Phase Shift NEMA 2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Taps Diagram No.1 Weight (Lbs.) Size Number

480 208Y/120 15 (+2, -4 2.5%) 12 240 S31AC 9T76W9871G03480 208Y/120 30 (+2, -4 2.5%) 12 360 S32AC 9T76W9872G03480 208Y/120 45 (+2, -4 2.5%) 12 460 S33AC 9T76W9873G03480 208Y/120 75 (+2, -4 2.5%) 12 690 S34AC 9T76W9874G03480 208Y/120 112.5 (+2, -4 2.5%) 12 850 S35AC 9T76W9875G03480 208Y/120 150 (+2, -4 2.5%) 12 1190 S36AC 9T76W9876G03480 208Y/120 225 (+2, -4 2.5%) 12 1710 S37AC 9T76W9877G03480 208Y/120 300 (+2, -4 2.5%) 12 3170 S38AC 9T76W9878G03

-30° Phase Shift NEMA 2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Taps Diagram No.1 Weight (Lbs.) Size Number

480 208Y/120 15 (+2, -4 2.5%) 12 240 S31AC 9T77W9871G03480 208Y/120 30 (+2, -4 2.5%) 12 360 S32AC 9T77W9872G03480 208Y/120 45 (+2, -4 2.5%) 12 460 S33AC 9T77W9873G03480 208Y/120 75 (+2, -4 2.5%) 12 690 S34AC 9T77W9874G03480 208Y/120 112.5 (+2, -4 2.5%) 12 850 S35AC 9T77W9875G03480 208Y/120 150 (+2, -4 2.5%) 12 1190 S36AC 9T77W9876G03480 208Y/120 225 (+2, -4 2.5%) 12 1710 S37AC 9T77W9877G03480 208Y/120 300 (+2, -4 2.5%) 12 3170 S38AC 9T77W9878G03


Ultra Energy Efficient Harmonic



TENV15-75kVA, Three-Phase, TP-1

Totally enclosed nonventilated (TENV) transformers are an excellent choice for applications where dry-type transformer benefits are desired but the standard enclosure openings areunacceptable because of adverse atmospheric conditions.TENV transformers are recommended where dust, dirt or lintmay be present or where transformers are subject to spraysor controlled wash-down conditions. They are UL Listedthrough 75kVA for indoor or protected outdoor applications.

Advantages—Dry-type transformer is housed in an enclosed NEMA 3R non-ventilated compartment

—Convenient wiring compartment is located beneath the transformer and has removable front and rear covers

—Copper bus bars are located at the front of the wiring compartment and are clearly labeled

—All electrical connections between the transformer and bus bars are factory wired

—Quiet performance – meets NEMA ST-20 —No-weld coil termination design – an industry first—Comprehensive factory testing assures quality

Features—Quiet design - unique core and coil design makes MidwestTENV transformers among the quietest available

—Core and coil assembly mounted on rubber isolation pads toreduce noise

—Bolted coil terminations are more reliable than welded terminations, and they eliminate weld failures and problemsassociated with welding and weld splatter

—100% factory tested for shorts and coil integrity, current andloss, voltage, impedance and noise

—Qualified to the seismic requirements of IEEE-693-1997 andIBC-2003

—Copper ground strap—Copper or aluminum windings available—Available in 150°C, 115°C, and 80°C rise models—Indoor or outdoor use

Applications—Textile—Automotive—Foundry—Paper mills—Wash-down areas

TENV Transformer

TENV Transformer (front panel removed)

Totally Enclosed, Nonventilated




Aluminum 150°C RiseInput Output Net Voltage Voltage kVA Taps Weight (Lbs.) Frame Size Product Number

480 208Y/120 15 (+2,-4 2.5%) 370 XV372 9T85W3871480 208Y/120 30 (+2,-4 2.5%) 450 XV373 9T85W3872480 208Y/120 45 (+2,-4 2.5%) 670 XV374 9T85W3873480 208Y/120 75 (+2,-4 2.5%) 815 XV375 9T85W3874


480 208Y/120 15 (+2,-4 2.5%) 370 XV372 9T85W3871G15480 208Y/120 30 (+2,-4 2.5%) 450 XV373 9T85W3872G15480 208Y/120 45 (+2,-4 2.5%) 670 XV374 9T85W3873G15


480 208Y/120 30 (+2,-4 2.5%) 670 XV374 9T85W3872G80480 208Y/120 45 (+2,-4 2.5%) 670 XV374 9T85W3873G80

Copper 150°C RiseInput Output Net Voltage Voltage kVA Taps Weight (Lbs.) Frame Size Product Number

480 208Y/120 15 (+2,-4 2.5%) 410 XV372 9T85W9871480 208Y/120 30 (+2,-4 2.5%) 525 XV373 9T85W9872480 208Y/120 45 (+2,-4 2.5%) 760 XV374 9T85W9873480 208Y/120 75 (+2,-4 2.5%) 1000 XV375 9T85W9874


480 208Y/120 15 (+2,-4 2.5%) 410 XV372 9T85W9871G15480 208Y/120 30 (+2,-4 2.5%) 525 XV373 9T85W9872G15480 208Y/120 45 (+2,-4 2.5%) 760 XV374 9T85W9873G15480 208Y/120 75 (+2,-4 2.5%) 1000 XV375 9T85W9874G15


480 208Y/120 15 (+2,-4 2.5%) 410 XV372 9T85W9871G80480 208Y/120 30 (+2,-4 2.5%) 760 XV374 9T85W9872G80480 208Y/120 45 (+2,-4 2.5%) 760 XV374 9T85W9873G80

TENVThree-Phase TP-1

Totally Enclosed, Nonventilated



Product DescriptionThe Midwest midtapped transformer enables the user to trans-form three-phase power from 480 Volts primary to 240 Volts secondary and have 120 Volt, reduced capacity tap (RCT) single-phase capability as well. This is because a single-phase midtap is brought out of one coil of the unit’s three-phase secondary winding. These transformers are UL listed,File E-79145.

ApplicationThe Midwest midtapped design can be used wherever there is480 Volt, three-phase supply available and the load is primari-ly 240 Volt three-phase with a nominal amount of 120 Volt,single-phase power required. Normally, in this instance, asmall single-phase as well as a three-phase transformerwould be required to provide the necessary transformation.Caution: When utilizing the 120 Volt midtap for single-phaseapplications, the single-phase load should not exceed 5 per-cent of the three-phase kVA rating. The three-phase kVA loadmust be reduced by the same percentage as that added bythe single-phase load. Additional loading beyond 5 percentmay cause the transformer to overheat and fail. If the single-phase load is in excess of 5 percent, it is recommended that aseparate single-phase unit be used to handle the load.

Midtapped Transformer

Aluminum150°C Rise 60HzInput Output NetVoltage Voltage kVA Taps Weight (Lbs.) Frame Size Product Number

480 240/120 15 (+2,-4 2.5%) 240 XV371 9T83W3841480 240/120 30 (+2,-4 2.5%) 334 XV372 9T83W3842480 240/120 45 (+2,-4 2.5%) 415 XV373 9T83W3843480 240/120 75 (+2,-4 2.5%) 620 XV374 9T83W3844480 240/120 112.5 (+2,-4 2.5%) 765 XV375 9T83W3845480 240/120 150 (+2,-4 2.5%) 1070 XV376 9T83W3846480 240/120 225 (+2,-4 2.5%) 1590 XV377 9T83W3847480 240/120 300 (+2,-4 2.5%) 1820 YF378 9T83W3848480 240/120 500 (+2,-2 2.5%) 3400 YF379 9T83W3849

115°C Rise 60HzInput Output NetVoltage Voltage kVA Taps Weight (Lbs.) Frame Size Product Number

480 240/120 15 (+2,-4 2.5%) 240 XV371 9T83W3841G15480 240/120 30 (+2,-4 2.5%) 334 XV372 9T83W3842G15480 240/120 45 (+2,-4 2.5%) 415 XV373 9T83W3843G15480 240/120 75 (+2,-4 2.5%) 620 XV374 9T83W3844G15480 240/120 112.5 (+2,-4 2.5%) 1070 XV376 9T83W3845G15480 240/120 150 (+2,-4 2.5%) 1590 XV377 9T83W3846G15480 240/120 225 (+2,-4 2.5%) 1820 YF378 9T83W3847G15

80°C Rise 60HzInput Output NetVoltage Voltage kVA Taps Weight (Lbs.) Frame Size Product Number


Midtapped Three-Phase TP-1





150°C Rise 60HzInput Output Net Voltage Voltage kVA Taps Weight (Lbs.) Frame Size Product Number

480 240/120 15 (+2,-4 2.5%) 250 XV371 9T83W9841480 240/120 30 (+2,-4 2.5%) 377 XV372 9T83W9842480 240/120 45 (+2,-4 2.5%) 490 XV373 9T83W9843480 240/120 75 (+2,-4 2.5%) 710 XV374 9T83W9844480 240/120 112.5 (+2,-4 2.5%) 949 XV375 9T83W9845480 240/120 150 (+2,-4 2.5%) 1190 XV376 9T83W9846480 240/120 225 (+2,-4 2.5%) 1710 XV377 9T83W9847480 240/120 300 (+2,-4 2.5%) 3150 YF378 9T83W9848480 240/120 500 (+2,-2 2.5%) 4050 YF379 9T83W9849





Midtapped



Single-Phase and Three-Phase

Wall Mount BracketFrame Size Product Number

H371C 9T18W5042H372C 9T18W5042H373C 9T18W5042H374C 9T18W5043S31AC 9T18W5042S32AC 9T18W5042S33AC 9T18W5042S34AC 9T18W5043XK372 9T18W5042XV173 9T18W5043XV371 9T18W5042XV372 9T18W5042XV373 9T18W5042XV374 9T18W5043Y371A 9T18W5042Y371C 9T18W5042Y372A 9T18W5042Y372C 9T18W5042Y373A 9T18W5042Y373C 9T18W5042Y374A 9T18W5043Y374C 9T18W5043YF171 9T18W5042YF172 9T18W5043YF173 9T18W5043YF174 9T18W5043

Rainshield KitFrame Size Product Number

FC67 9T18W4322G68FC68 9T18W4322G68FC77 9T18W4322G77FC78 9T18W4322G78FC79 9T18W4322G79H371C 9T18W4317G11H372C 9T18W4317G05H373C 9T18W4317G05H374C 9T18W4317G06H375C 9T18W4322G79H376C 9T18W4322G79S31AC 9T18W4317G11S32AC 9T18W4317G05S33AC 9T18W4317G05S34AC 9T18W4317G06S35AC 9T18W4317G06S36AC 9T18W4317G07S37AC 9T18W4322G79S38AC 9T18W4322G88XK372 9T18W4317G05XV173 9T18W4317G06XV371 9T18W4317G11XV372 9T18W4317G05XV373 9T18W4317G05XV374 9T18W4317G06XV375 9T18W4317G06XV376 9T18W4317G07XV377 9T18W4322G88Y371A 9T18W4317G11Y371C 9T18W4317G11Y372A 9T18W4317G05Y372C 9T18W4317G05Y373A 9T18W4317G05Y373C 9T18W4317G05Y374A 9T18W4317G06Y374C 9T18W4317G06Y375C 9T18W4317G06Y376C 9T18W4317G07YF171 9T18W4317G05YF172 9T18W4317G06YF173 9T18W4317G06YF174 9T18W4317G06YF175 9T18W4322G77YF176 9T18W4322G79YF177 9T18W4322G79YF378 9T18W4322G88YF379 9T18W4322G68XV378 9T18W4322G88L37AA 9T18W4322G88L38AA 9T18W4322G88L39AA 9T18W4322G68L47AA 9T18W4322G98

Bottom PanFrame Size Product Number

F77C 9T18W4504G77FC67 9T18W4504G68FC68 9T18W4504G68FC77 9T18W4504G77FC78 9T18W4504G78FC79 9T18W4504G79S37AC 9T18W4504G79S38AC 9T18W4504G79XV377 9T18W4504G79Y377A 9T18W4504G79YF175 9T18W4504G77YF176 9T18W4504G79YF177 9T18W4504G79YF378 9T18W4504G79YF379 9T18W4504G68XV378 9T18W4504G79H375C 9T18W4504G79H376C 9T18W4504G79L37AA 9T18W4504G79L38AA 9T18W4504G79L39AA 9T18W4504G68

Lug KitsFrame Size Product Number

F77C 9T18W7242G02FC67 9T18W7242G10FC68 9T18W7242G10FC77 9T18W7242G02FC78 9T18W7242G04FC79 9T18W7242G06H371C 9T18W7327H372C 9T18W7240H373C 9T18W7240H374C 9T18W7241H375C 9T18W7242H376C 9T18W7242G03S31AC 9T18W7327S32AC 9T18W7240S33AC 9T18W7240S34AC 9T18W7241S35AC 9T18W7242S37AC 9T18W7242G02S38AC 9T18W7242G04XK372 9T18W7240XV173 9T18W7241G03XV371 9T18W7327XV372 9T18W7240XV373 9T18W7240XV374 9T18W7241XV375 9T18W7242XV376 9T18W7242G03XV377 9T18W7242G06XV378 9T18W7242G04Y371A 9T18W7327Y371C 9T18W7327Y372A 9T18W7240Y372C 9T18W7240Y373A 9T18W7240Y373C 9T18W7240Y374A 9T18W7241Y374C 9T18W7241Y375C 9T18W7242Y376C 9T18W7242G03Y377A 9T18W7242G02YF171 9T18W7240G02YF172 9T18W7241G03YF174 9T18W7240G03YF175 9T18W7242G07YF176 9T18W7242G05YF378 9T18W7242G04YF379 9T18W7242G06L37AA 9T18W7242G02L38AA 9T18W7242G04L39AA 9T18W7242G06L47AA 9T18W7242G10

Accessories and Lugs




Lug Kit InformationSpecified Lug Kit

Lug Size No.1 Lug Size No.2

Frame Typical Primary Bus Bar Secondary Bus Bar Kit Conductor Stud Conductor Stud Size Transformer Size Holes (Qty/Size) Holes (Qty/Size) Number Qty Size Hole Size Qty Size Hole Size

YF171 1 ph - 15/25 kVA (2) .406 dia (2) .406 dia

9T18W7240G021 8 6 AWG to 250 MCM 5/16 N/A N/A N/A(2670/2671)YF171 1 ph - 37.5 kVA (2) .563 dia (2) .563 dia

(2672)YF172 1 ph - 50 kVA (2) .563 dia (2) .563 dia 9T18W7241G03 4 6 AWG to 250 MCM 5/16 4 6 AWG to 350 MCM 3/8

(2673)YF174 1 ph - 75 kVA (2) .563 dia (2) .563 dia 9T18W7240G03 12 6 AWG to 250 MCM 5/16 N/A N/A N/A

(2674)YF175 1 ph -100 kVA (2) .563 dia (2) .563 dia 9T18W7242G07 12 6 AWG to 350 MCM 3/8 N/A N/A N/A

(2675)YF176 1 ph - 167 kVA (4) .563 dia (4) .563 dia 9T18W7242G05 8 6 AWG to 350 MCM 3/8 12 4 AWG to 500 MCM 3/8

(2676)XV371 3 ph - 15 kVA (2) .406 dia (2) .406 dia 9T18W73271 7 14 AWG to 1/0 AWG 1/4 N/A N/A N/A

(3871)XV372/XV373 3 ph - 30/45 kVA (2) .406 dia (2) .406 dia 9T18W72401 7 6 AWG to 250 MCM 5/16 N/A N/A N/A

(3872/3873)XV374 3 ph - 75 kVA (2) .406 dia (2) .406 dia 9T18W7241 3 6 AWG to 250 MCM 5/16 8 6 AWG to 350 MCM 3/8

(3874)XV375 3 ph - 112.5 kVA (1) .563 dia (2) .563 dia 9T18W7242 11 6 AWG to 350 MCM 3/8 N/A N/A N/A

(3875)XV376 3 ph - 150 kVA (1) .563 dia (2) .563 dia 9T18W7242G03 3 6 AWG to 350 MCM 3/8 8 4 AWG to 500 MCM 3/8

(3876)XV377 3 ph - 225 kVA (2) .563 dia (4) .563 dia 9T18W7242G02 22 6 AWG to 350 MCM 3/8 N/A N/A N/A



(3879)

1Proximity of bus bars would prohibit dual lugs per bus bar

Fan Cooled Disconnect Switch Lug Information(Fan Cooled transformers are supplied with lugs on the primary side of the disconnect switch. This chart providesinformation on those lugs.)

Primary Load LugsLug Hole No.1 Lug Hole No.2 Lug Hole No.3

Frame Lug Qty of Holes Qty of Lugs UL Certified UL Certified UL Certified Size Part No. Amps Per Lug Per Phase Dia (in.) Wire Sizes Cu-AL Dia (in.) Wire Sizes Cu-AL Dia (in.) Wire Sizes Cu-AL

FC77 TCAL432 thru 400 2 1 0.922 2/0 - 600 Kcmil Cu or Al 0.609 6 - 250 Kcmil Cu or Al N/A N/A

FC78 TCAL633 450-600 2 1 0.844 4/0-350 Kcmil Cu or 0.844 4/0-350 Kcmil Cu or N/A N/A3/0-500 Kcmil Al 3/0-500 Kcmil Al

FC79 TCAL814 700-1000 3 1 0.844 3/0-500 Kcmil Cu or Al 0.844 3/0-500 Kcmil Cu or Al 0.844 500 MCMFC67 TCAL814 700-1000 3 2 0.844 3/0-500 Kcmil Cu or Al 0.844 3/0-500 Kcmil Cu or Al 0.844 500 MCMFC68 TCAL814 700-1000 3 2 0.844 3/0-500 Kcmil Cu or Al 0.844 3/0-500 Kcmil Cu or Al 0.844 500 MCM

2May use twin 250 Kcmil Cu or Al.3The TCAL43 lugs could be substituted for the TCAL63 lugs to give customer a 600 mcm hole.4The TCAL124 lubs can be substituted for the TCAL81 lugs. TCAL124 = 3 holes at 350–750 Kcmil (1.055 dia) > some sizing differences.

Single-Phase and Three-PhaseAccessories and Lugs



Enclosure Parts for Midwest 9T4 TransformersFrame Size

FC77 (225 kVA frame size) FC78 (300 kVA frame size) FC79 (500 kVA frame size) FC67 (750 kVA frame size) FC68 (1000 kVA frame size)

Description Product No. Product No. Product No. Product No. Product No. Cover (Top) Panel 9T18W4501G77 9T18W4501G78 9T18W4501G79 9T18W4501G68 9T18W4501G68Front/Back Panel 9T18W4502G77 9T18W4502G78 9T18W4502G79 9T18W4502G68 9T18W4502G68Grill, Front/Back 9T18W4503G77 9T18W4503G78 9T18W4503G79 9T18W4503G68 9T18W4503G68Bottom Pan 9T18W4504G77 9T18W4504G78 9T18W4504G79 9T18W4504G68 9T18W4504G68Side Panel 9T18W4505G77 9T18W4505G78 9T18W4505G79 9T18W4505G68 9T18W4505G68Enclosure Kit1 9T18W4506G77 9T18W4506G78 9T18W4506G79 9T18W4506G68 9T18W4506G68Fan Assembly 9T18W4507G77 9T18W4507G78 9T18W4507G79 9T18W4507G68 9T18W4507G68Isomode Pads 9T18W4508G77 9T18W4508G78 9T18W4508G79 9T18W4508G68 9T18W4508G68Disconnect Switch 9T18W4509G77 9T18W4509G78 9T18W4509G79 9T18W4509G68 9T18W4509G68Rainshield Kit 9T18W4322G77 9T18W4322G78 9T18W4322G79 9T18W4322G68 9T18W4322G68

1Enclosure Kit Contains 2 Side Panels, 2 Front/Back panels, and Cover

Enclosure Parts for Midwest General Purpose TransformersEnclosure Kit2 Front/Back Panel Side Panel Cover (Top) Panel Base

FrameSize Product No. Product No. Product No. Product No. Product No.XV371 9T18W4421 9T18W4421G03 9T18W4421G04 9T18W4421G05XV372 9T18W4412 9T18W4412G03 9T18W4412G04 9T18W4412G05XV373 9T18W4412 9T18W4412G03 9T18W4412G04 9T18W4412G05 Not User ReplaceableXV374 9T18W4413 9T18W4413G03 9T18W4413G04 9T18W4414G05 Contact Technical SupportXV375 9T18W4414 9T18W4414G03 9T18W4414G04 9T18W4414G05XV376 9T18W4415 9T18W4415G03 9T18W4415G04 9T18W4415G05XV377 9T18W4506G79 9T18W4502G79 9T18W4505G79 9T18W4501G79

2Enclosure Kit Contains 2 Front/Backs, 2 Sides, 1 Cover

FRONT/BACKPANEL

COVER (TOP)PANEL

SIDE PANEL

BASE

ENCLOSURE KIT: 1 COVER + 2 SIDES + 2 FRONTS

General Purpose Enclosure

FRONT/BACKPANEL

COVER (TOP)PANEL

SIDE PANEL

GRILL

BOTTOM PAN(NOT SHOWN)

ENCLOSURE KIT: 1 COVER + 2 SIDES + 2 FRONTS

9T4 Style Enclosure

Enclosure Parts




9T4 TransformerMidwest Transformer (Front Panel Removed)

1-Phase Vented TransformersFrame Size Outline Drawing No. Height (In.) Width (In.) Depth (In.)

YF171 303B406MWP071 32.1 23.8 18.4YF172 303B406MWP072 35.7 31.8 24XV173 303B406MWP073 35.7 31.8 24YF174 303B406MWP074 39.9 31.8 24YF175 303B932MWP075 37.4 29.5 28.5YF176 303B932MWP076 45.5 38.5 33YF177 303B932MWP077 45.5 38.5 33

3-Phase, Vented, Non-Fan Cooled Transformers (9T8, 9T7, 9T6 models) Includes General Purpose, K-Factor, K-Factor LowNoise, Low Noise, Guard I, Midtapped, Drive IsolationFrame Size Outline Drawing Height (in.) Width (In.) Depth (In.)

XV371 303B401MWP071 27.3 18.7 16.9Y371A 303B401MWP071 27.3 18.7 16.9Y371C 303B401MWP071 27.3 18.7 16.9XV372 303B401MWP072 32.1 23.8 18.4XK372 303B401MWP072 32.1 23.8 18.4Y372A 303B401MWP072 32.1 23.8 18.4Y372C 303B401MWP072 32.1 23.8 18.4XV373 303B401MWP073 32.1 23.8 18.4Y373A 303B401MWP073 32.1 23.8 18.4Y373C 303B401MWP073 32.1 23.8 18.4XV374 303B401MWP074 35.7 31.8 24Y374A 303B401MWP074 35.7 31.8 24Y374C 303B401MWP074 35.7 31.8 24XV375 303B401MWP075 39.9 31.8 24Y375C 303B401MWP075 39.9 31.8 24XV376 303B401MWP076 45.9 34.8 24Y376C 303B401MWP076 45.9 34.8 24L47AA 303B912MWP167 65.7 57.7 48.2L37AA 303B912MWP177 45.4 38.4 33L38AA 303B912MWP178 57.1 38.4 33L39AA 303B912MWP179 65.7 47.1 38XV377 303B919MWP077 45.5 38.5 33Y377A 303B919MWP077 45.5 38.5 33YF378 303B919MWP178 57.1 38.5 33YF379 303B919MWP179 65.7 47.3 38

3-Phase Fan-Cooled Transformers (9T4-models) Includes General Purpose, K-Factor, K-Factor Low Noise, Low Noise, Guard I, Midtapped, and Drive IsolationFrame Size Outline Drawing Height (in.) Width (In.) Depth (In.)

FC77 303B899MWP077 37.3 29.5 28.5FC78 303B899MWP078 40.9 34.8 25.6FC79 303B899MWP079 45.4 38.5 33.6FC67 303B899MWP067 57.5 47.5 40FC68 303B899MWP068 57.5 47.5 40

5 - 25 kVA General Purpose Encapsulated TransformersFrame Size Outline Drawing Height (in.) Width (In.) Depth (In.)

16350 303B923MWP005 14.5 10.62 1116400 303B923MWP005 14.5 10.62 1116450 303B923MWP005 14.5 10.62 1116600 303B923MWP007 17.06 10.62 1119400 303B923MWP010 17.06 12.5 12.519450 303B923MWP010 17.06 12.5 12.519500 303B915MWP015 35 12.62 12.621619 303B922MWP001 14.50 10.75 11.121620 303B922MWP001 14.50 10.75 11.121921 303B922MWP003 17.12 12.62 12.751923 303B922MWP004 18.81 14.75 14.5350500 303B915MWP025 44.75 16.75 16

Guard II TransformersFrame Size Outline Drawing No. Height (In.) Width (In.) Depth (In.)

XV371 303B403MWP071 34.5 18.7 16.9XV372 303B403MWP072 41.3 23.8 18.4XV373 303B403MWP073 41.3 23.8 18.4XV374 303B403MWP074 44.8 31.8 24XV375 303B403MWP075 49.1 31.8 24

Guard III Harmonic MitigatingFrame Size Outline Drawing No. Height (In.) Width (In.) Depth (In.)

H371C 303B431MWP071 32.3 23.8 18.4H372C 303B431MWP072 35.7 31.8 24H373C 303B431MWP073 35.7 31.8 24H374C 303B431MWP074 39.9 31.8 24H375C 303B931MWP075 45.5 38.6 33H376C 303B931MWP076 45.4 38.5 33

TENV TransformersFrame Size Outline Drawing No. Height (In.) Width (In.) Depth (In.)

XV372 303B405MWP072 41.3 23.8 18.4XV373 303B405MWP073 41.3 23.8 18.4XV374 303B405MWP074 44.8 31.8 24XV375 303B405MWP075 49.1 31.8 24

0.050 - 3 kVA General Purpose EncapsulatedTransformersFrame Size Outline Drawing No. Height (In.) Width (In.) Depth (In.)

6100 303B920MWP001 6.38 5.12 3.256150 303B920MWP001 6.38 5.12 3.256200 303B920MWP001 6.38 5.12 3.258175 303B920MWP002 7.38 6.12 4.258200 303B920MWP002 7.38 6.12 4.2510200 303B920MWP003 8.38 6.88 4.8810225 303B920MWP003 8.38 6.88 4.8812200 303B920MWP004 9.62 7.88 5.512225 303B920MWP004 9.62 7.88 5.512275 303B920MWP004 9.62 7.88 5.512300 303B920MWP004 9.62 7.88 5.514200 303B920MWP005 11.12 9.38 6.7214225 303B920MWP005 11.12 9.38 6.7214250 303B920MWP005 11.12 9.38 6.7214300 303B920MWP005 11.12 9.38 6.7214350 303B920MWP005 11.12 9.38 6.7214400 303B920MWP005 11.12 9.38 6.72

Dimensions



Diagram 1 Diagram 2 Diagram 3 Diagram 4


Diagram 9 Diagram 10 Diagram 11




Diagram 12

Wiring Diagrams




Single-Phase NEMA 3R

0.050 - 3 kVA Indoor/Outdoor UL Listed C-UL ListedInput Output Frequency Wiring Weight Frame ProductVoltage Voltage kVA (Hz) Taps Diagram No.1 (Lbs) Size Number

240 x 480 Volts, 480 Volts 120/240 Volts 0.05 60 Hz No Taps 1 6 6100 9T51W0002240 x 480 Volts 120/240 Volts 0.05 50 Hz No Taps 1 6 6100 9T51W0502240 x 480 Volts, 480 Volts 120/240 Volts 0.075 60 Hz No Taps 1 6 6200 9T51W0003240 x 480 Volts 120/240 Volts 0.075 50 Hz No Taps 1 6 6200 9T51W0503240 x 480 Volts, 480 Volts 120/240 Volts 0.1 60 Hz No Taps 1 6 6200 9T51W0004240 x 480 Volts 120/240 Volts 0.1 50 Hz No Taps 1 6 6200 9T51W0504240 x 480 Volts, 480 Volts 120/240 Volts 0.15 60 Hz No Taps 1 10 8175 9T51W0005240 x 480 Volts 120/240 Volts 0.15 50 Hz No Taps 1 10 8175 9T51W0505240 x 480 Volts, 480 Volts 120/240 Volts 0.25 60 Hz No Taps 1 10 8175 9T51W0007240 x 480 Volts 120/240 Volts 0.25 50 Hz No Taps 1 10 8200 9T51W0507240 x 480 Volts, 480 Volts 120/240 Volts 0.5 60 Hz No Taps 1 16 10200 9T51W0008240 x 480 Volts 120/240 Volts 0.5 50 Hz No Taps 1 20 10225 9T51W0508240 x 480 Volts, 480 Volts 120/240 Volts 0.75 60 Hz No Taps 1 25 12200 9T51W0009240 x 480 Volts 120/240 Volts 0.75 50 Hz No Taps 1 25 12225 9T51W0509240 x 480 Volts, 480 Volts 120/240 Volts 1 60 Hz No Taps 1 25 12225 9T51W0010240 x 480 Volts 120/240 Volts 1 50 Hz No Taps 1 30 12275 9T51W0510240 x 480 Volts, 480 Volts 120/240 Volts 1.5 60 Hz No Taps 1 40 14200 9T51W0011240 x 480 Volts 120/240 Volts 1.5 50 Hz No Taps 1 40 14225 9T51W0511240 x 480 Volts, 480 Volts 120/240 Volts 2 60 Hz No Taps 1 45 14250 9T51W0012240 x 480 Volts 120/240 Volts 2 50 Hz No Taps 1 50 14300 9T51W0512240 x 480 Volts, 480 Volts 120/240 Volts 3 60 Hz No Taps 1 55 14350 9T51W0013240 x 480 Volts 120/240 Volts 3 50 Hz No Taps 1 60 14400 9T51W0513480 Volts 120/240 Volts 0.5 50 Hz (-2 5.0%) 2 20 10225 9T51W0548480 Volts 120/240 Volts 0.75 50 Hz (-2 5.0%) 2 25 12200 9T51W0549480 Volts 120/240 Volts 1 60 Hz (-2 5.0%) 2 25 12225 9T51W0050480 Volts 120/240 Volts 1 50 Hz (-2 5.0%) 2 30 12275 9T51W0550480 Volts 120/240 Volts 1.5 60 Hz (-2 5.0%) 2 40 14200 9T51W0051480 Volts 120/240 Volts 1.5 50 Hz (-2 5.0%) 2 40 14225 9T51W0551480 Volts 120/240 Volts 2 60 Hz (-2 5.0%) 2 45 14250 9T51W0052480 Volts 120/240 Volts 2 50 Hz (-2 5.0%) 2 50 14300 9T51W0552480 Volts 120/240 Volts 3 60 Hz (-2 5.0%) 2 55 14350 9T51W0053480 Volts 120/240 Volts 3 60 Hz (+2,-2 2.5%) 3 55 14350 9T51W0135480 Volts 120/240 Volts 3 50 Hz (-2 5.0%) 2 60 14400 9T51W0553600 Volts 120/240 Volts 0.05 60 Hz No Taps 5 6 6100 9T51W0082600 Volts 120/240 Volts 0.075 60 Hz No Taps 5 6 6200 9T51W0083600 Volts 120/240 Volts 0.1 60 Hz No Taps 5 6 6200 9T51W0084600 Volts 120/240 Volts 0.1 50 Hz No Taps 5 6 6200 9T51W0584600 Volts 120/240 Volts 0.15 60 Hz No Taps 5 10 8175 9T51W0085600 Volts 120/240 Volts 0.25 60 Hz No Taps 5 10 8175 9T51W0087600 Volts 120/240 Volts 0.25 50 Hz No Taps 5 10 8200 9T51W0587600 Volts 120/240 Volts 0.5 60 Hz No Taps 5 16 10200 9T51W0088600 Volts 120/240 Volts 0.5 50 Hz (-2 5.0%) 2 20 10225 9T51W0568600 Volts 120/240 Volts 0.75 60 Hz No Taps 5 25 12200 9T51W0089600 Volts 120/240 Volts 0.75 50 Hz (-2 5.0%) 2 25 12200 9T51W0569600 Volts 120/240 Volts 1 60 Hz (-2 5.0%) 2 25 12225 9T51W0070600 Volts 120/240 Volts 1 60 Hz No Taps 5 25 12225 9T51W0090600 Volts 120/240 Volts 1 50 Hz (-2 5.0%) 2 30 12275 9T51W0570600 Volts 120/240 Volts 1.5 60 Hz (-2 5.0%) 2 40 14200 9T51W0071600 Volts 120/240 Volts 1.5 60 Hz No Taps 5 40 14200 9T51W0091600 Volts 120/240 Volts 1.5 50 Hz (-2 5.0%) 2 40 14225 9T51W0571600 Volts 120/240 Volts 2 60 Hz (-2 5.0%) 2 45 14250 9T51W0072600 Volts 120/240 Volts 2 60 Hz No Taps 5 45 14250 9T51W0092600 Volts 120/240 Volts 2 50 Hz (-2 5.0%) 2 50 14300 9T51W0572600 Volts 120/240 Volts 2 50 Hz No Taps 50 14300 9T51W0592600 Volts 120/240 Volts 3 60 Hz (-2 5.0%) 2 55 14350 9T51W0073600 Volts 120/240 Volts 3 60 Hz No Taps 5 55 14350 9T51W0093600 Volts 120/240 Volts 3 50 Hz (-2 5.0%) 2 60 14400 9T51W0573600 Volts 120/240 Volts 3 50 Hz No Taps 60 14400 9T51W0593


General Purpose Encapsulated





120 x 240 Volts 120/240 Volts 0.05 60 Hz No Taps 1 6 6100 9T51W0022120 x 240 Volts 120/240 Volts 0.1 60 Hz No Taps 1 6 6200 9T51W0024120 x 240 Volts 120/240 Volts 0.15 60 Hz No Taps 1 10 8175 9T51W0025120 x 240 Volts 120/240 Volts 0.25 60 Hz No Taps 1 10 8175 9T51W0027120 x 240 Volts 120/240 Volts 0.5 60 Hz No Taps 1 16 10200 9T51W0028120 x 240 Volts 120/240 Volts 0.75 60 Hz No Taps 1 25 12200 9T51W0029120 x 240 Volts 120/240 Volts 1 60 Hz No Taps 1 25 12225 9T51W0030120 x 240 Volts 120/240 Volts 1.5 60 Hz No Taps 1 40 14200 9T51W0031120 x 240 Volts 120/240 Volts 2 60 Hz No Taps 1 45 14250 9T51W0032120 x 240 Volts 120/240 Volts 3 60 Hz No Taps 1 60 14400 9T51W0033208 Volts 120/240 Volts 0.5 60 Hz No Taps 4 16 10200 9T51W0158208 Volts 120/240 Volts 0.75 60 Hz No Taps 4 25 12200 9T51W0159208 Volts 120/240 Volts 1 60 Hz No Taps 4 25 12225 9T51W0160208 Volts 120/240 Volts 2 60 Hz No Taps 4 45 14250 9T51W0156208 Volts 120/240 Volts 3 60 Hz No Taps 4 55 14350 9T51W0157


277 Volts 120/240 Volts 0.25 60 Hz (-2 5.1%) 2 10 8175 9T51W0187277 Volts 120/240 Volts 0.5 60 Hz (-2 5.1%) 2 16 10200 9T51W0188277 Volts 120/240 Volts 0.75 60 Hz (-2 5.1%) 2 25 12200 9T51W0189277 Volts 120/240 Volts 1 60 Hz (-2 5.1%) 2 30 12275 9T51W0190277 Volts 120/240 Volts 1.5 60 Hz (-2 5.1%) 2 40 14200 9T51W0191277 Volts 120/240 Volts 2 60 Hz (-2 5.1%) 2 45 14250 9T51W0192277 Volts 120/240 Volts 3 60 Hz (-2 5.1%) 2 55 14350 9T51W0193380/400/416 Volts 120/240 Volts 0.05 50 Hz No Taps 2 6 6150 9T51W0162380/400/416 Volts 120/240 Volts 0.15 50 Hz No Taps 2 10 8175 9T51W0165380/400/416 Volts 120/240 Volts 0.25 50 Hz No Taps 2 10 8200 9T51W0167380/400/416 Volts 120/240 Volts 0.5 50 Hz No Taps 2 20 10225 9T51W0168380/400/416 Volts 120/240 Volts 0.75 50 Hz No Taps 2 25 12200 9T51W0169380/400/416 Volts 120/240 Volts 1 50 Hz No Taps 2 30 12275 9T51W0170380/400/416 Volts 120/240 Volts 1.5 50 Hz No Taps 2 40 14225 9T51W0171380/400/416 Volts 120/240 Volts 2 50 Hz No Taps 2 50 14300 9T51W0172380/400/416 Volts 120/240 Volts 3 50 Hz No Taps 2 60 14400 9T51W0173







5 - 25 kVA Indoor/Outdoor 115°C Rise UL Listed C-UL ListedInput Output Frequency Wiring Weight Frame ProductVoltage Voltage kVA (Hz) Taps Diagram No.1 (Lbs) Size Number

120 x 240 Volts 120/240 Volts 5 60 Hz No Taps 1 103 16350 9T21W1001G02120 x 240 Volts 120/240 Volts 7.5 60 Hz No Taps 1 147 16600 9T21W1002G02120 x 240 Volts 120/240 Volts 10 60 Hz No Taps 1 198 19400 9T21W1003G02120 x 240 Volts 120/240 Volts 10 60 Hz No Taps 1 198 19400 9T21W1054G02120 x 240 Volts 120/240 Volts 15 60 Hz No Taps 1 220 19500 9T21W9101120 x 240 Volts 120/240 Volts 15 60 Hz No Taps 1 233 19550 9T21W9131120 x 240 Volts 120/240 Volts 25 60 Hz No Taps 1 233 19550 9T21W9102208 Volts 120/240 Volts 5 60 Hz No Taps 4 103 16350 9T21W1028G02208 Volts 120/240 Volts 7.5 60 Hz No Taps 4 147 16600 9T21W1029G02208 Volts 120/240 Volts 10 60 Hz No Taps 4 198 19400 9T21W1030G02208 Volts 120/240 Volts 15 60 Hz No Taps 4 220 19500 9T21W9119208 Volts 120/240 Volts 25 60 Hz No Taps 4 388 50500 9T21W9120



277 Volts 120/240 Volts 5 60 Hz (-2 5.1%) 2 103 16350 9T21W1046G02277 Volts 120/240 Volts 5 60 Hz (-2 2.5%) 2 103 16350 9T21W1265G02277 Volts 120/240 Volts 7.5 60 Hz (-2 5.1%) 2 147 16600 9T21W1047G02277 Volts 120/240 Volts 10 60 Hz (-2 5.1%) 2 198 19400 9T21W1048G02277 Volts 120/240 Volts 10 60 Hz (-2 2.5%) 2 198 19400 9T21W1266G02277 Volts 120/240 Volts 15 60 Hz (-2 5.1%) 2 220 19500 9T21W9143277 Volts 120/240 Volts 25 60 Hz (-2 4.7%) 2 388 50500 9T21W9144



240 x 480 Volts 120/240 Volts 5 60 No Taps 1 103 16350 9T21W1004G02240 x 480 Volts 120/240 Volts 5 50 No Taps 1 115 16400 9T21W1055G02240 x 480 Volts 120/240 Volts 7.5 60 No Taps 1 147 16600 9T21W1005G02240 x 480 Volts 120/240 Volts 7.5 50 No Taps 1 174 16600 9T21W1056G02240 x 480 Volts 120/240 Volts 10 60 No Taps 1 198 19400 9T21W1006G02240 x 480 Volts 120/240 Volts 10 50 No Taps 1 198 19400 9T21W1057G02240 x 480 Volts 120/240 Volts 15 60 No Taps 1 220 19500 9T21W9103240 x 480 Volts 120/240 Volts 15 50 No Taps 1 233 19550 9T21W9133240 x 480 Volts 120/240 Volts 25 60 No Taps 1 388 50500 9T21W9104240 x 480 Volts 120/240 Volts 25 50 No Taps 1 428 50600 9T21W9134480 Volts 120/240 Volts 5 60 (-2 5.0%) 2 103 16350 9T21W1007G02480 Volts 120/240 Volts 5 60 (+2,-2 2.5%) 3 103 16350 9T21W1013G02480 Volts 120/240 Volts 7.5 60 (-2 5.0%) 2 147 16600 9T21W1008G02480 Volts 120/240 Volts 7.5 60 (+2,-2 2.5%) 3 147 16600 9T21W1014G02480 Volts 120/240 Volts 10 60 (-2 4.9%) 2 198 19400 9T21W1009G02480 Volts 120/240 Volts 10 60 (+2,-2 2.6%) 3 198 19400 9T21W1015G02480 Volts 120/240 Volts 15 60 (-2 5.0%) 2 220 19500 9T21W9105480 Volts 120/240 Volts 15 60 (+2,-2 2.5%) 3 220 19500 9T21W9109480 Volts 120/240 Volts 25 60 (-2 5.0%) 2 388 50500 9T21W9106480 Volts 120/240 Volts 25 60 (+2,-2 2.5%) 3 388 50500 9T21W9110600 Volts 120/240 Volts 5 60 No Taps 5 103 16350 9T21W1016G02600 Volts 120/240 Volts 5 60 (-2 5.0%) 2 103 16350 9T21W1019G02600 Volts 120/240 Volts 5 60 (+2,-2 2.5%) 107 16350 9T21W1025G02600 Volts 120/240 Volts 7.5 60 (-2 5.0%) 2 147 16600 9T21W1020G02600 Volts 120/240 Volts 10 60 (-2 4.9%) 2 198 19400 9T21W1021G02600 Volts 120/240 Volts 15 60 No Taps 5 220 19500 9T21W9111600 Volts 120/240 Volts 15 60 (-2 4.8%) 2 220 19500 9T21W9113600 Volts 120/240 Volts 25 60 (-2 5.0%) 2 388 50500 9T21W9114

1See page 41 for wiring diagrams..




EncapsulatedFor Bucking and Boosting Voltage

Product DescriptionBuck boost transformers are small, single-phase, dry typedistribution transformers designed and shipped asinsulating/isolating transformers. They have a dual voltageprimary and a dual voltage secondary. These transformerscan be connected for a wide range of voltage combinations.The most common use is to buck (lower) or boost (raise) thesupply voltage a small amount, usually 5 to 27%. Buck boosttransformers comply with NEC Article 210-9, Exception 1,when field connected as an autotransformer.Midwest bucking and boosting transformers provide an eco-nomical and convenient means for bucking or boosting volt-age, usually no more than ±20% on single- and three-phasecircuits. They are compact, relatively light in weight, and canbe easily installed for indoor or outdoor service.Buck-boost transformers are employed primarily for boosting single-and three-phase circuits by connecting them as autotransformers. When connected as an autotransformer,only the low-voltage, high-current capacity secondary wind-ings are required to carry the load. Because this load is onlytransformed over a small change in voltage, the buck-boosttransformer can handle loads many times its nameplate kVA rating.The transformers with series-multiple 12/24, 24/48, or 16/32Volt secondary windings are suitable for a wide variety ofapplications. Two or more units can be used in various combi-nations to obtain many other special voltages.

Advantages—Efficient insulating materials permit compact size and light weight

—Dual voltage primary and dual voltage secondary for maximum versatility

—Large, front-accessible wiring compartment permits fast, easy wiring

—Convenient conduit knockouts located on side, bottom andback of wiring compartment

—Many Midwest buck-boost transformers fit competitormounting footprints

—Indoor or outdoor service

Key Features—Convenient and least expensive method of matching line voltage with equipment voltage

—More efficient than equivalent isolation transformers—Ability to handle loads up to 20 times nameplate ratingwhen connected as an autotransformer

—Ideal for changing line voltages by small amounts—Primary voltages include 120V, 240V and 480V—Secondary voltages include 12V, 16V, 24V, 32V, 48V—UL and cUL Listed—Qualified to the seismic requirements of IEEE-693-1997and IBC-2003

Wiring Diagram for Low Voltage Loads

Indoor/Outdoor Transformer; Single-Phase

Applications—International voltage adaptation—Commercial and industrial air conditioning—Heating systems—Induction motors—Voltage line drop correction—Landscape lighting—Low-voltage lighting

Efficient operation of electrical equipment requires that linevoltage be at or near the nameplate rating of the equipment.In order to match available line voltage (whether it be too highor low) with equipment voltage, buck-boost transformers pro-vide the most convenient and least expensive method.Do not use buck-boost transformers to solve a fluctuating volt-age problem. They should be used to compensate for high- orlow-voltage conditions only when the available line voltage is reasonably constant.

Buck-Boost




EncapsulatedAutotransformersFor Bucking and Boosting Voltage

For Bucking or Boosting Voltage of Single-Phase Indoor/Outdoor 60 Hz UL Listed CSA Certified1Approx. Net Frame Product

Input Voltage Output Voltage kVA2 Height (in) Width (in) Depth (in) Weight (Lbs.) Size Number

240/120 Volts 120 or 240/120 Volts 0.5 7.38 6.13 4.25 10 8175 9T51W0136(Three-Wire)


240/120 Volts 120 or 240/120 Volts 1 8.38 6.88 4.88 16 10200 9T51W0138(Three-Wire)



240/120 Volts 120 or 240/120 Volts) 3 11.13 9.38 6.75 40 14200 9T51W0141(Three-Wire)


1Through 3 kVA

For Bucking or Boosting Voltage of Single-Phase Indoor/Outdoor 60 Hz UL Listed CSA CertifiedApprox. Net Frame Product


240/120 Volts 120 or 240/120 Volts 10 14.50 10.62 11.00 103 16350 9T21W4553G02(Three-Wire)



2kVA output at 120 Volts, two-wire, or allowable unbalance at 240/120 Volts, three-wire.

For Boosting Voltage of Three-Phase Indoor/Outdoor 60 Hz UL ListedApprox. Net Frame Product


208Y/120 Volts 230/133 Volts 6 7.38 6.13 4.25 10 8175 9T51W0143208Y/120 Volts 230/133 Volts 9 8.38 6.88 4.88 16 10200 9T51W0144208Y/120 Volts 230/133 Volts 15 8.38 6.88 4.88 20 10225 9T51W0145208Y/120 Volts 230/133 Volts 30 9.63 7.88 5.50 30 12275 9T51W0146208Y/120 Volts 230/133 Volts 45 11.13 9.38 6.75 40 14200 9T51W0147208Y/120 Volts 230/133 Volts 75 11.13 9.38 6.75 60 14400 9T51W0148208Y/120 Volts 240/120 Volts 6 7.38 6.13 4.25 10 8175 9T51W0150208Y/120 Volts 240/120 Volts 15 9.63 7.88 5.50 25 12200 9T51W0152208Y/120 Volts 240/120 Volts 30 11.13 9.38 6.75 40 14200 9T51W0153208Y/120 Volts 240/120 Volts 45 11.13 9.38 6.75 45 14250 9T51W0154

3Bank of three single-phase autotransformers to be connected wye. Price is for one single unit. Dimensions and weights are for each unit in bank. Each singleautotransformer is rated 1/3 of the bank kVA rating. Order three single-phase transformers for each three-phase bank.

Conversion ChartDecimal Fraction.13 1/8.38 3/8.63 5/8.88 7/8

Wiring Diagram: Single-Phase

Wiring Diagram: Three-Phase

Buck-Boost




Single-Phase Indoor/Outdoor 60 Hz UL Listed C-UL ListedApprox. Net Frame Product

Input Voltage Output Voltage kVA Height (in) Width (in) Depth (in) Weight (Lbs.) Size Number

120/240 Volts 12/24 Volts 0.05 6.38 5.12 3.25 6 6100 9T51W0102120/240 Volts 12/24 Volts 0.075 6.38 5.12 3.25 6 6200 9T51W0103120/240 Volts 12/24 Volts 0.1 6.38 5.12 3.25 6 6200 9T51W0104120/240 Volts 12/24 Volts 0.15 7.38 6.12 4.25 10 8175 9T51W0105120/240 Volts 12/24 Volts 0.25 7.38 6.12 4.25 10 8175 9T51W0107120/240 Volts 12/24 Volts 0.5 8.38 6.88 4.88 20 10225 9T51W0108120/240 Volts 12/24 Volts 0.75 9.62 7.88 5.50 25 12200 9T51W0109120/240 Volts 12/24 Volts 1 9.62 7.88 5.50 25 12225 9T51W0110120/240 Volts 12/24 Volts 1.5 11.12 9.38 6.72 40 14200 9T51W0111120/240 Volts 12/24 Volts 2 11.12 9.38 6.72 50 14300 9T51W0112120/240 Volts 12/24 Volts 3 9.38 6.72 55 14350 9T51W0113120/240 Volts 16/32 Volts 0.05 6.38 5.12 3.25 6 6100 9T51W0122120/240 Volts 16/32 Volts 0.075 6.38 5.12 3.25 6 6200 9T51W0123120/240 Volts 16/32 Volts 0.1 6.38 5.12 3.25 6 6200 9T51W0124120/240 Volts 16/32 Volts 0.15 7.38 6.12 4.25 10 8175 9T51W0125120/240 Volts 16/32 Volts 0.25 7.38 6.12 4.25 10 8175 9T51W0127120/240 Volts 16/32 Volts 0.5 8.38 6.88 4.88 20 10225 9T51W0128120/240 Volts 16/32 Volts 0.75 9.62 7.88 5.50 25 12200 9T51W0129120/240 Volts 16/32 Volts 1 9.62 7.88 5.50 30 12300 9T51W0130120/240 Volts 16/32 Volts 1.5 11.12 9.38 6.72 40 14200 9T51W0131120/240 Volts 16/32 Volts 2 11.12 9.38 6.72 50 14300 9T51W0132120/240 Volts 16/32 Volts 3 9.38 6.72 55 14350 9T51W0133240/480 Volts 24/48 Volts 0.05 6.38 5.12 3.25 6 6100 9T51W0202240/480 Volts 24/48 Volts 0.075 6.38 5.12 3.25 6 6200 9T51W0203240/480 Volts 24/48 Volts 0.1 6.38 5.12 3.25 6 6200 9T51W0204240/480 Volts 24/48 Volts 0.15 7.38 6.12 4.25 10 8175 9T51W0205240/480 Volts 24/48 Volts 0.25 7.38 6.12 4.25 10 8175 9T51W0207240/480 Volts 24/48 Volts 0.5 8.38 6.88 4.88 20 10225 9T51W0208240/480 Volts 24/48 Volts 0.75 9.62 7.88 5.50 25 12200 9T51W0209240/480 Volts 24/48 Volts 1 9.62 7.88 5.50 30 12275 9T51W0210240/480 Volts 24/48 Volts 1.5 11.12 9.38 6.72 40 14200 9T51W0211240/480 Volts 24/48 Volts 2 11.12 9.38 6.72 50 14300 9T51W0212240/480 Volts 24/48 Volts 3 11.12 9.38 6.72 55 14350 9T51W0213



120/240 Volts 12/24 Volts 5 14.5 10.62 11 103 16350 9T21W1037G02120/240 Volts 16/32 Volts 5 14.5 10.62 11 115 16400 9T21W1040G02



120/240 Volts 12/24 Volts 5 14.5 10.62 11 115 16400 9T21W1061G02120/240 Volts 16/32 Volts 5 14.5 10.62 11 127 16450 9T21W1064G02

NOTE: In addition to bucking or boosting low circuit voltages to related value, these transformers can be used as two winding transformers to supply the ratednameplate low voltages, 12 to 48 Volts, two-wire or 12/24 to 24/48 Volts, three-wire. Also available in 50/60 Hz ratings.

Buck-Boost





5-Step SelectionThe tables on these pages greatly facilitate buck-boost trans-former selection. Simply follow these five easy steps:

1. Refer to the table having the same “output voltage” as the equipment you want to operate. For example, if you areinstalling a 230 Volt single-phase air conditioner, use the 230 Volt table.

2. Different available “line voltages” are listed across the topof each table. Select the line voltage column closest toyour actual supply. If your available line voltage is exactlymidway between two listed voltage levels, you may useeither voltage column. For example, in the 230 Volt table, if you have 212 available, use either the 208 or the 216 column.

3. Read down the available line voltage column until youreach the rated load kVA of the equipment you want tooperate or “the next higher kVA” rating. For example, in the230 Volt table under the 208 available line voltage column,you want to operate an air conditioner rated 2 kVA. Since 2kVA is not list ed as such, you must read down to the nexthigher value or 2.4 kVA.

Table 1230 Volts Output, 60 Hertz, Single-Phase

Available Line Voltage

192 203 208 216 219 242 245 353 261 276

Product Number Load kVA1

9T51W0102 — — 0.480 — 0.960 1.0 — 0.530 — —9T51W0122 — 0.360 — 0.720 — — 0.770 — 0.410 —9T51W0202 0.240 — — — — — — — — 0.2889T51W0103 — — 0.720 — 1.5 1.6 — 0.800 — —9T51W0123 — 0.540 — 1.1 — — 1.2 — 0.620 —9T51W0203 0.359 — — — — — — — — 0.4319T51W0104 — — 0.960 — 2.0 2.1 — 1.1 — —9T51W0124 — 0.720 — 1.5 — — 1.6 — 0.820 —9T51W0204 0.479 — — — — — — — — 0.5759T51W0105 — — 1.5 — 2.9 3.1 — 1.6 — —9T51W0125 — 1.1 — 2.2 — — 2.3 — 1.3 —9T51W0205 0.719 — — — — — — — — 0.8639T51W0107 — — 2.4 — 4.8 5.1 — 2.7 — —9T51W0127 — 1.8 — 3.6 — — 3.9 — 2.1 —9T51W0207 1.2 — — — — — — — — 1.49T51W0108 — — 4.8 — 9.6 10.1 — 5.3 — —9T51W0128 — 3.6 — 7.2 — — 7.7 — 4.1 —9T51W0208 2.4 — — — — — — — — 2.99T51W0109 — — 7.2 — 14.4 15.2 — 7.9 — —9T51W0129 — 5.4 — 10.8 — — 11.5 — 6.2 —9T51W0209 3.6 — — — — — — — — 4.39T51W0110 — — 9.6 — 19.2 20.2 — 10.6 — —9T51W0130 — 7.2 — 14.4 — — 15.4 — 8.2 —9T51W0210 4.8 — — — — — — — — 5.79T51W0111 — — 14.4 — 28.8 30.3 — 15.9 — —9T51W0131 — 10.8 — 21.6 — — 23.0 — 12.3 —9T51W0211 7.2 — — — — — — — — 8.69T51W0112 — — 19.1 — 38.4 40.4 — 21.1 — —9T51W0132 — 14.4 — 28.8 — — 30.7 — 16.4 —9T51W0212 9.6 — — — — — — — — 11.59T51W0113 — — 28.7 — 57.5 60.5 — 31.7 — —9T51W0133 — 21.6 — 43.2 — — 46.0 — 24.5 —9T51W0213 14.4 — — — — — — — — 17.39T21W1037G02 — — 47.8 — 95.9 100.9 — 52.7 — —9T21W1040G02 — 36.0 — 72.0 — — 77.0 — 40.8 —Connection Diagram C A A B B B B A A CPage 55

1The load kVA is the maximum load at voltages shown when transformers are connected as autotransformers according to the diagram referenced.

4. Once you have established this point, read across to thefar left column for the exact Midwest buck-boost modelnumber for your application. For example, the 230 Volttable under the 208 column for a 2 kVA air conditioner,read across from 2.4 (next higher kVA rating) and themodel number is 9T51W0107.

5. Connect the buck-boost transformer you have selected perthe connection diagram specified at the “bottom” of theavailable line voltage column you used. For example, if youused the 208 column, you would connect the buck-boosttransformer per connection diagram A. That’s all there is toit! The transformer you’ve selected will meet your exactrequirements when connected in the specified manner.

The formula for calculating single-phase kVA is:

Load Voltage × Full Load Amps1000

The formula for calculating three-phase kVA is:

1.732 × Load Voltage × Load Amps1000

Buck-Boost Selection Tables



Encapsulated For Bucking and Boosting Voltage



200 212 218 225 229 252 256 264 272 288


9T51W0102 — — 0.500 — 1.0 1.1 — 0.6 — —9T51W0122 — 0.380 — 0.750 — — 0.800 — 0.430 —9T51W0202 0.250 — — — — — — — — 0.3009T51W0103 — — 0.750 — 1.5 1.6 — 0.825 — —9T51W0123 — 0.570 — 1.2 — — 1.2 — 0.640 —9T51W0203 0.375 — — — — — — — — 0.3919T51W0104 — — 1.0 — 2.0 2.1 — 1.1 — —9T51W0124 — 0.750 — 1.5 — — 1.6 — 0.850 —9T51W0204 0.500 — — — — — — — — 0.5229T51W0105 — — 1.5 — 3.0 3.2 — 1.7 — —9T51W0125 — 1.2 — 2.3 — — 2.4 — 1.3 —9T51W0205 0.750 — — — — — — — — 0.7829T51W0107 — — 2.5 — 5.0 5.3 — 2.8 — —9T51W0127 — 1.9 — 3.8 — — 4.0 — 2.2 —9T51W0207 1.3 — — — — — — — — 1.49T51W0108 — — 5.0 — 10.0 10.5 — 5.5 — —9T51W0128 — 3.8 — 7.5 — — 8.0 — 4.3 —9T51W0208 2.5 — — — — — — — — 2.69T51W0109 — — 7.5 — 15.0 15.8 — 8.3 — —9T51W0129 — 5.7 — 11.3 — — 12.0 — 6.4 —9T51W0209 3.8 — — — — — — — — 4.09T51W0110 — — 10.0 — 20.0 21.0 — 11.0 — —9T51W0130 — 7.5 — 15.0 — — 16.0 — 8.5 —9T51W0210 5.0 — — — — — — — — 5.29T51W0111 — — 15.0 — 30.0 31.5 — 16.5 — —9T51W0131 — 11.3 — 22.5 — — 24.0 — 12.8 —9T51W0211 7.5 — — — — — — — — 7.89T51W0112 — — 20.0 — 40.0 42.6 — 22.0 — —9T51W0132 — 15.0 — 30.0 — — 32.0 — 17.0 —9T51W0212 10.0 — — — — — — — — 10.49T51W0113 — — 30.0 — 60.0 63.0 — 33.0 — —9T51W0133 — 22.5 — 45.0 — — 48.0 — 25.5 —9T51W0213 15.0 — — — — — — — — 15.69T21W1037G02 — — 50.0 — 100.0 105.0 — 55.0 — —9T21W1040G02 — 37.5 — 75.0 — — 80.0 — 42.5 —Connection Diagram C A A B B B B A A CPage 55









91 96 101 105 127 130 138 146


9T51W0102 — 0.240 — 0.480 0.539 — 0.290 —9T51W0122 0.180 — 0.360 — — 0.410 — 0.2309T51W0103 — 0.360 — 0.720 0.800 — 0.440 —9T51W0123 0.270 — 0.540 — — 0.610 — 0.3509T51W0104 — 0.480 — 0.960 1.1 — 0.580 —9T51W0124 0.360 — 0.720 — — 0.820 — 0.4609T51W0105 — 0.720 — 1.5 1.6 — 0.870 —9T51W0125 0.540 — 1.1 — — 1.3 — 0.6909T51W0107 — 1.2 — 2.4 2.7 — 1.5 —9T51W0127 0.900 — 1.8 — — 2.1 — 1.29T51W0108 — 2.4 — 4.8 5.3 — 2.9 —9T51W0128 1.8 — 3.6 — — 4.1 — 2.39T51W0109 — 3.6 — 7.2 8.0 — 4.4 —9T51W0129 2.7 — 5.4 — — 6.1 — 3.59T51W0110 — 4.8 — 9.6 10.6 — 5.8 —9T51W0130 3.6 — 7.2 — — 8.2 — 4.69T51W0111 — 7.2 — 14.4 15.9 — 8.6 —9T51W0131 5.4 — 10.8 — — 12.2 — 6.99T51W0112 — 9.6 — 19.2 21.2 — 11.5 —9T51W0132 7.2 — 14.4 — — 16.3 — 9.29T51W0113 — 14.4 — 28.8 31.8 — 17.3 —9T51W0133 10.8 — 21.6 — — 24.4 — 13.79T21W1061G02 — 24.0 — 48.0 53.0 — 28.8 —9T21W1037G02 — 24.0 — 48.0 53.0 — 28.8 —9T21W1064G02 18.0 — 36.0 — — 41.0 — 22.99T21W1040G02 18.0 — 36.0 — — 41.0 — 22.9Connection Diagram C C D D D D C CPage 55




95 100 106 109 132 136 144 152


9T51W0102 — 0.250 — 0.500 0.550 — 0.300 —9T51W0122 0.190 — 0.380 — — 0.430 — 0.2409T51W0103 — 0.380 — 0.750 0.830 — 0.450 —9T51W0123 0.290 — 0.570 — — 0.640 — 0.3609T51W0104 — 0.500 — 1.0 1.1 — 0.600 —9T51W0124 0.380 — 0.750 — — 0.850 — 0.4809T51W0105 — 0.750 — 1.5 1.7 — 0.900 —9T51W0125 0.570 — 1.2 — — 1.3 — 0.7209T51W0107 — 1.3 — 2.5 2.8 — 1.5 —9T51W0127 0.940 — 1.9 — — 2.2 — 1.29T51W0108 — 2.5 — 5.0 5.5 — 3.0 —9T51W0128 1.9 — 3.8 — — 4.3 — 2.49T51W0109 — 3.8 — 7.5 8.3 — 4.5 —9T51W0129 2.9 — 5.7 — — 6.4 — 3.69T51W0110 — 5.0 — 10.0 11.0 — 6.0 —9T51W0130 3.8 — 7.5 — — 8.5 — 4.89T51W0111 — 7.5 — 15.0 16.5 — 9.0 —9T51W0131 5.7 — 11.3 — — 12.8 — 7.29T51W0112 — 10.0 — 20.0 22.0 — 12.0 —9T51W0132 7.5 — 15.0 — — 17.0 — 9.59T51W0113 — 15.0 — 30.0 33.0 — 18.0 —9T51W0133 11.3 — 22.5 — — 25.5 — 14.39T21W1061G02 — 25.0 — 50.0 55.0 — 30.0 —9T21W1037G02 — 25.0 — 50.0 55.0 — 30.0 —9T21W1064G02 18.8 — 38.0 — — 43.0 — 23.89T21W1040G02 18.8 — 38.0 — — 43.0 — 23.8Connection Diagram C C D D D D C CPage 55






Table 5230 Volts, 3-Wire Output, 60 Hertz, Three-Phase2


Quantity Required Product 181Y/105 192Y/111 203Y/117 208Y/120 277Y/160

Per Bank Number Load kVA1

3 9T51W0102 — 0.830 — 1.7 —3 9T51W0122 0.620 — 1.3 — —3 9T51W0202 — — — — 0.4803 9T51W0103 — 1.2 — 2.5 —3 9T51W0123 0.930 — 1.9 — —3 9T51W0203 — — — — 0.7203 9T51W0104 — 1.7 — 3.4 —3 9T51W0124 1.2 — 2.5 — —3 9T51W0204 — — — — 0.9603 9T51W0105 — 2.5 — 5.0 —3 9T51W0125 1.9 — 3.7 — —3 9T51W0205 — — — — 1.443 9T51W0107 — 4.2 — 8.3 —3 9T51W0127 3.1 — 6.2 — —3 9T51W0207 — — — — 2.43 9T51W0108 — 8.3 — 16.6 —3 9T51W0128 6.2 — 12.5 — —3 9T51W0208 — — — — 4.83 9T51W0109 — 12.5 — 25.0 —3 9T51W0129 9.3 — 18.7 — —3 9T51W0209 — — — — 7.23 9T51W0110 — 16.6 — 33.2 —3 9T51W0130 12.5 — 25.0 — —3 9T51W0210 — — — — 9.63 9T51W0111 — 25.0 — 50.0 —3 9T51W0131 18.7 — 37.0 — —3 9T51W0211 — — — — 14.43 9T51W0112 — 33.0 — 66.0 —3 9T51W0132 25.0 — 50.0 — —3 9T51W0212 — — — — 19.23 9T51W0113 — 50.0 — 100.0 —3 9T51W0133 37.5 — 75.0 — —3 9T51W0213 — — — — 28.83 9T21W1037G02 — 83.0 — 167.0 —3 9T21W1040G02 62.0 — 125.0 — —

Connection Diagram F F G G FPage 55

1The load kVA is the maximum load at voltages shown when transformers are connected as autotransformers according to the diagram referenced.2See Caution page 53, footnote 1.








189Y/109 200Y/115 208Y/1203 218Y/126 288Y/166

Quantity Required Product 212Y/122


3 9T51W0102 — 0.870 — 1.7 —3 9T51W0122 0.650 — 1.3 — —3 9T51W0202 — — — — 0.5003 9T51W0103 — 1.3 — 2.6 —3 9T51W0123 0.970 — 2.0 — —3 9T51W0203 — — — — 0.7503 9T51W0104 — 1.7 — 3.5 —3 9T51W0124 1.3 — 2.6 — —3 9T51W0204 — — — — 1.03 9T51W0105 — 2.6 — 5.2 —3 9T51W0125 2.0 — 3.9 — —3 9T51W0205 — — — — 1.53 9T51W0107 — 4.3 — 8.7 —3 9T51W0127 3.2 — 6.5 — —3 9T51W0207 — — — — 2.53 9T51W0108 — 8.7 — 17.3 —3 9T51W0128 6.5 — 13.0 — —3 9T51W0208 — — — — 5.03 9T51W0109 — 13.0 — 26.0 —3 9T51W0129 9.7 — 19.5 — —3 9T51W0209 — — — — 7.53 9T51W0110 — 17.3 — 34.6 —3 9T51W0130 13.0 — 26.0 — —3 9T51W0210 — — — — 10.03 9T51W0111 — 26.0 — 52.0 —3 9T51W0131 19.5 — 39.0 — —3 9T51W0211 — — — — 15.03 9T51W0112 — 35.0 — 70.0 —3 9T51W0132 26.0 — 52.0 — —3 9T51W0212 — — — — 20.03 9T51W0113 — 52.0 — 104.0 —3 9T51W0133 39.0 — 78.0 — —3 9T51W0213 — — — — 30.03 9T21W1037G02 — 87.0 — 173.0 —3 9T21W1040G02 65.0 — 130.0 — —

Connection Diagram F F G G FPage 55

1The load kVA is the maximum load at voltages shown when transformers are connected as autotransformers according to the diagram referenced.2See Caution page 53, footnote 1.3When 208Y/120 Volts is the available line voltage, the 212Y/122 column may be used to obtain 236 Volts which should be satisfactory for most applications.






Available Line Voltage — 3- or 4-Wire

Quantity Required Product 385 406 418 432 438


3 9T51W0102 — — 1.66 — 3.323 9T51W0122 — 1.25 — 2.49 —3 9T51W0202 0.830 — — — —3 9T51W0103 — — 2.48 — 4.963 9T51W0123 — 1.87 — 3.73 —3 9T51W0203 1.2 — — — —3 9T51W0104 — — 3.31 — 6.623 9T51W0124 — 2.49 — 4.97 —3 9T51W0204 1.7 — — — —3 9T51W0105 — — 4.97 — 9.943 9T51W0125 — 3.73 — 3.9 —3 9T51W0205 2.5 — — — —3 9T51W0107 — — 8.28 — 16.63 9T51W0127 — 6.22 — 6.5 —3 9T51W0207 4.2 — — — —3 9T51W0108 — — 16.6 — 33.23 9T51W0128 — 12.5 — 13.0 —3 9T51W0208 8.3 — — — —3 9T51W0109 — — 24.8 — 59.63 9T51W0129 — 18.7 — 19.5 —3 9T51W0209 12.5 — — — —3 9T51W0110 — — 33.1 — 66.23 9T51W0130 — 24.9 — 26.0 —3 9T51W0210 16.6 — — — —3 9T51W0111 — — 49.7 — 99.43 9T51W0131 — 37.3 — 39.0 —3 9T51W0211 24.9 — — — —3 9T51W0112 — — 66.3 — 133.03 9T51W0132 — 49.7 — 52.0 —3 9T51W0212 33.2 — — — —3 9T51W0113 — — 99.3 — 198.63 9T51W0133 — 74.6 — 78.0 —3 9T51W0213 49.8 — — — —3 9T21W1037G02 — — 166.0 — 322.03 9T21W1040G02 — 125.0 — 130.0 —

Connection Diagram F H H I IPage 55

1Caution: If input is 3-wire Delta or 4-wire midtapped Delta, the neutral established from the bank of buck-boost transformers must be insulated and isolated from the input power neutral and/or ground.









Quantity Required Product 400 424 436 450


9T51W0102 — — 1.74 —3 9T51W0122 — 1.3 — 2.63 9T51W0202 0.866 — — —3 9T51W0103 — — 2.6 —3 9T51W0123 — 1.95 — 3.93 9T51W0203 1.3 — — —3 9T51W0104 — — 3.5 —3 9T51W0124 — 2.6 — 5.23 9T51W0204 1.7 — — —3 9T51W0105 — — 5.2 —3 9T51W0125 — 3.9 — 7.83 9T51W0205 2.6 — — —3 9T51W0107 — — 8.7 —3 9T51W0127 — 6.3 — 13.03 9T51W0207 4.3 — — —3 9T51W0108 — — 17.4 —3 9T51W0128 — 13.0 — 26.03 9T51W0208 8.7 — — —3 9T51W0109 — — 26.0 —3 9T51W0129 — 19.5 — 39.03 9T51W0209 13.0 — — —3 9T51W0110 — — 35.0 —3 9T51W0130 — 26.0 — 52.03 9T51W0210 17.3 — — —3 9T51W0111 — — 52.2 —3 9T51W0131 — 39.0 — 78.03 9T51W0211 26.0 — — —3 9T51W0112 — — 69.0 —3 9T51W0132 — 52.0 — 104.03 9T51W0212 34.6 — — —3 9T51W0113 — — 104.0 —3 9T51W0133 — 78.0 — 156.03 9T51W0213 51.9 — — —3 9T21W1037G02 — — 174.0 —3 9T21W1040G02 — 130.0 — 260.0

Connection Diagram F H H IPage 55

Table 9208 Volts, 3-Wire, 60 Hertz, Three-Phase1


Quantity Required Product 218 222 229 236


2 9T51W0102 1.6 — 0.800 —2 9T51W0122 — 1.2 — 0.6402 9T51W0103 2.3 — 1.2 —2 9T51W0123 — 1.8 — 0.9602 9T51W0104 3.2 — 1.6 —2 9T51W0124 — 2.4 — 1.32 9T51W0105 4.7 — 2.5 —2 9T51W0125 — 3.6 — 1.92 9T51W0107 7.8 — 4.1 —2 9T51W0127 — 6.0 — 3.22 9T51W0108 16 — 8.0 —2 9T51W0128 — 12.0 — 6.42 9T51W0109 23.6 — 12.4 —2 9T51W0129 — 18.0 — 9.62 9T51W0110 31.5 — 16.5 —2 9T51W0130 — 24.0 — 12.72 9T51W0111 47.5 — 24.8 —2 9T51W0131 — 36.0 — 19.12 9T51W0112 63.0 — 33.0 —2 9T51W0132 — 48.0 — 25.62 9T51W0113 94 — 49.6 —2 9T51W0133 — 72.0 — 38.3

Connection Diagram J J Z ZPage 55

1Caution: If input is 3-wire Delta or 4-wire midtapped Delta, the neutral established from the bank of buck-boost transformers must be insulated and isolated from the input power neutral and/or ground.





Connection Diagrams

Buck-Boost Connection Diagrams




Machine Tool and Control PowerProduct DescriptionCore and coil transformers for machine tools are used to pro-vide voltage to control devices in applications where regula-tion and minimum space are important. Welded cores providethe highest quality electrical performance and quiet operation.Standards: Transformers conform to NEMA ST20Listings: UL listed under UL-5085, File E2739

CSA Certified under C22.2, Number 66, File 3272Insulation Classes: 150VA and below: 105°C insulation

class, 55°C Rise200VA and above: 185°C (NEMA) 180°C (UL) insulation class, 115°C Rise

Frequency: 60 Hz standard; 50 Hz optional.Voltage Regulation: All designs 2.0 kVA and below are com-pensated for voltage drop. Compensation ranges from 10% inthe smallest rating to 3% for the largest. All machine tooldesigns meet or exceed NMTBA regulation requirements.Series-Multiple Secondary Connections: Transformers with120/240 V secondaries (series-multiple) may be connected for120 V, 240 V or 240/120 V three-wire. Jumpers are provided.Overcurrent Protection: Transformers are low impedancetransformers that require overcurrent protection for most applications. They provide for optional integral primary and/or secondary fusing.Mounting Dimensions: Transformers are lightweight, small,and designed for minimum mounting dimensions. Many unitswill fit competitors mounting footprints.

Advantages—Finger-safe terminals offer added protection and safety—Pressure plate terminals ensure secure connections—Wide variety of fusing options

Key Features—Terminal Board Connection—Rugged, high-impact plastic terminal board—Full head #8 brass screws assure quick, easy terminationswith maximum connection integrity

—Copper windings—Flexible design allows input or output voltage to match anyapplication

—CUL, CE, UL approvals—Available fuse-blocks offer simple, low-cost fusing

Core and Coil Transformer

Core and Coil Transformer

Open Core and Coil Transformers


Machine Tool ApplicationsSingle-Phase, Non-encapsulated Design

60 Hz Terminal Board ConnectionInput Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Diagram No.1 Weight (Lbs) Size Number

220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.05 1 2.4 6100 9T58W0042220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.08 1 2.8 6125 9T58W0043220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.10 1 3.6 8100 9T58W0044220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.15 1 5.1 8150 9T58W0045220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.20 1 5.8 8175 9T58W0046220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.25 1 6.5 8200 9T58W0047220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.30 1 7.6 8250 9T58W0048220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.38 1 7.6 8250 9T58W0049220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.50 1 10.7 10225 9T58W0050220x440, 230x460,240x480 Volts 110, 115, 120 Volts 0.75 1 12 12225 9T58W0051220x440, 230x460,240x480 Volts 110, 115, 120 Volts 1 1 16.1 12300 9T58W0052220x440, 230x460,240x480 Volts 110, 115, 120 Volts 2 1 26.7 14225 9T58W0053220x440, 230x460,240x480 Volts 110, 115, 120 Volts 2 1 32.7 14300 9T58W0054220x440, 230x460,240x480 Volts 110, 115, 120 Volts 3 1 47.4 14475 9T58W0055

50/60 Hz Terminal Board ConnectionInput Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Diagram No.1 Weight (Lbs) Size Number

230/460/575 Volts 115/95 Volts 0.05 2 3.1 6150 9T58W0062230/460/575 Volts 115/95 Volts 0.08 2 3.6 8100 9T58W0063230/460/575 Volts 115/95 Volts 0.10 2 5.1 8150 9T58W0064230/460/575 Volts 115/95 Volts 0.15 2 6.5 8200 9T58W0065230/460/575 Volts 115/95 Volts 0.20 2 6.5 8200 9T58W0066230/460/575 Volts 115/95 Volts 0.25 2 7.6 8250 9T58W0067230/460/575 Volts 115/95 Volts 0.30 2 10.7 10225 9T58W0068230/460/575 Volts 115/95 Volts 0.38 2 10.7 10225 9T58W0069230/460/575 Volts 115/95 Volts 0.50 2 10.7 10225 9T58W0070230/460/575 Volts 115/95 Volts 0.75 2 16.1 12300 9T58W0071230/460/575 Volts 115/95 Volts 1 2 26.7 14225 9T58W0072230/460/575 Volts 115/95 Volts 1.5 2 32.7 14300 9T58W0073230/460/575 Volts 115/95 Volts 2 2 47.4 14475 9T58W0074208/277/380 Volts 115/95 Volts 0.05 3 3.1 6150 9T58W0082208/277/380 Volts 115/95 Volts 0.08 3 3.6 8100 9T58W0083208/277/380 Volts 115/95 Volts 0.10 3 5.1 8150 9T58W0084208/277/380 Volts 115/95 Volts 0.15 3 6.5 8200 9T58W0085208/277/380 Volts 115/95 Volts 0.20 3 6.5 8200 9T58W0086208/277/380 Volts 115/95 Volts 0.25 3 7.6 8250 9T58W0087208/277/380 Volts 115/95 Volts 0.30 3 10.7 10225 9T58W0088208/277/380 Volts 115/95 Volts 0.38 3 10.7 10225 9T58W0089208/277/380 Volts 115/95 Volts 0.50 3 10.7 10225 9T58W0090208/277/380 Volts 115/95 Volts 0.75 3 16.1 12300 9T58W0091208/277/380 Volts 115/95 Volts 1 3 26.7 14225 9T58W0092208/277/380 Volts 115/95 Volts 1.5 3 32.7 14300 9T58W0093208/277/380 Volts 115/95 Volts 2 3 47.4 14475 9T58W0094


Factory- or Field-Installed OptionsSecondary Fusing—Factory- or field-installed secondary fuseclips are available. They are restricted to units with terminalstrips and a single secondary voltage or secondary with one tap.Dual Primary and Secondary Fusing—Factory- or field-installed dual primary and secondary fuse clips are availableon all units.

Dry Type TransformersOpen Core and Coil Transformers




ControlSingle-Phase, Non-encapsulated Design


240x480 Volts 120/240 Volts 0.05 4 2.4 6100 9T58W2802240x480 Volts 120/240 Volts 0.08 4 2.8 6125 9T58W2803240x480 Volts 120/240 Volts 0.10 4 3.6 8100 9T58W2804240x480 Volts 120/240 Volts 0.15 4 5.1 8150 9T58W2805240x480 Volts 120/240 Volts 0.20 4 5.8 8175 9T58W2806240x480 Volts 120/240 Volts 0.25 4 6.5 8200 9T58W2807240x480 Volts 120/240 Volts 0.30 4 6.5 8200 9T58W2808240x480 Volts 120/240 Volts 0.38 4 7.6 8250 9T58W2809240x480 Volts 120/240 Volts 0.50 4 10.7 10225 9T58W2810240x480 Volts 120/240 Volts 0.75 4 12 12225 9T58W2811240x480 Volts 120/240 Volts 1 4 16.1 12300 9T58W2812240x480 Volts 120/240 Volts 1.5 4 26.7 14225 9T58W2813240x480 Volts 120/240 Volts 2 4 32.7 14300 9T58W2814240x480 Volts 120/240 Volts 3 4 47.4 14475 9T58W2815600 Volts 120/240 Volts 0.08 5 2.8 6125 9T58W2823600 Volts 120/240 Volts 0.10 5 3.6 8100 9T58W2824600 Volts 120/240 Volts 0.20 5 5.8 8175 9T58W2826600 Volts 120/240 Volts 0.25 5 6.5 8200 9T58W2827600 Volts 120/240 Volts 0.30 5 6.5 8200 9T58W2828600 Volts 120/240 Volts 0.50 5 10.7 10225 9T58W2830600 Volts 120/240 Volts 0.75 5 12 12225 9T58W2831600 Volts 120/240 Volts 1 5 16.1 12300 9T58W2832600 Volts 120/240 Volts 1.5 5 26.7 14225 9T58W2833600 Volts 120/240 Volts 2 5 32.7 14300 9T58W2834600 Volts 120/240 Volts 3 5 47.4 14475 9T58W2835120x240 Volts 120/240 Volts 0.10 6 3.6 8100 9T58W2907120x240 Volts 120/240 Volts 0.20 6 5.8 8175 9T58W2909120x240 Volts 120/240 Volts 0.30 6 6.5 8200 9T58W2911120x240 Volts 120/240 Volts 0.50 6 10.7 10225 9T58W2913120x240 Volts 120/240 Volts 0.75 6 12 12225 9T58W2914120x240 Volts 120/240 Volts 1 6 16.1 12300 9T58W2915120x240 Volts 120/240 Volts 2 6 32.7 14300 9T58W2917120x240 Volts 120/240 Volts 3 6 47.4 14475 9T58W2918


120 x 240 Volts 12/24 Volts 0.05 7 2.4 6100 9T58W2873120 x 240 Volts 12/24 Volts 0.075 7 2.8 6125 9T58W2874120 x 240 Volts 12/24 Volts 0.10 7 3.6 8100 9T58W2875120 x 240 Volts 12/24 Volts 0.15 7 5.1 8150 9T58W2876120 x 240 Volts 12/24 Volts 0.20 7 5.8 8175 9T58W2877120 x 240 Volts 12/24 Volts 0.25 7 6.5 8200 9T58W2878120 x 240 Volts 12/24 Volts 0.30 7 6.5 8200 9T58W2879240 x 480 Volts 12/24 Volts 0.25 – 6.5 8200 9T58W3024240 x 480 Volts 12/24 Volts 0.05 – 2.4 6100 9T58W3164240 x 480 Volts 12/24 Volts 0.10 – 3.6 8100 9T58W4132240 x 480 Volts 12/24 Volts 0.15 – 5.1 8150 9T58W4133208 x 240 Volts 12/24 Volts 0.05 – 2.4 6100 9T58W4050208 x 240 Volts 12/24 Volts 0.10 – 3.6 8100 9T58W4051208 x 240 Volts 12/24 Volts 0.15 – 5.1 8150 9T58W4052208 x 240 Volts 12/24 Volts 0.25 – 6.5 8200 9T58W4053

50/60 Hz Terminal Board ConnectionInput Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Diagram No.1 Weight (Lbs) Size Number

240 x 480 Volts 120/240 Volts 0.50 4 10.7 10225 9T58W2930240 x 480 Volts 120/240 Volts 0.75 4 16.1 12300 9T58W2931240 x 480 Volts 120/240 Volts 1 4 26.7 14225 9T58W2932240 x 480 Volts 120/240 Volts 1.5 4 32.7 14300 9T58W2933240 x 480 Volts 120/240 Volts 2 4 47.4 14475 9T58W2934240 x 480 Volts 120/240 Volts 3 4 47.4 14475 9T58W2935380/400/416 Volts 115/230 Volts 0.25 8 6.5 8200 9T58W2975380/400/416 Volts 115/230 Volts 0.50 8 10.7 10225 9T58W2978380/400/416 Volts 115/230 Volts 0.75 8 16.1 12300 9T58W2979380/400/416 Volts 115/230 Volts 1 8 26.7 14225 9T58W2980380/400/416 Volts 115/230 Volts 1.5 8 32.7 14300 9T58W2981380/400/416 Volts 115/230 Volts 2 8 47.4 14475 9T58W2982380/400/416 Volts 115/230 Volts 3 8 47.4 14475 9T58W2983





ControlSingle-Phase, Non-encapsulated Design

60 Hz Leads Out Connection2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Diagram No.1 Weight (Lbs) Size Number

120x240 Volts 12/24 Volts 0.05 7 2.4 6100 9T58W1873G07120x240 Volts 12/24 Volts 0.075 7 2.8 6125 9T58W1874G07120x240 Volts 12/24 Volts 0.10 7 3.6 8100 9T58W1875G07120x240 Volts 12/24 Volts 0.15 7 5.1 8150 9T58W1876G07120x240 Volts 12/24 Volts 0.20 7 5.8 8175 9T58W1877G07120x240 Volts 12/24 Volts 0.25 7 6.5 8200 9T58W1878G07120x240 Volts 12/24 Volts 0.30 7 6.5 8200 9T58W1879G07120x240 Volts 12/24 Volts 0.50 7 10.7 10225 9T58W1881G07120x240 Volts 12/24 Volts 0.75 7 12 12225 9T58W1882G07120x240 Volts 12/24 Volts 1 7 26.7 14225 9T58W1883G07

60 Hz Leads Out Connection2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Diagram No.1 Weight (Lbs) Size Number

240 x 480 Volts 120/240 Volts 0.05 4 2.4 6100 9T58W1802G07240 x 480 Volts 120/240 Volts 0.075 4 2.8 6125 9T58W1803G07240 x 480 Volts 120/240 Volts 0.10 4 3.6 8100 9T58W1804G07240 x 480 Volts 120/240 Volts 0.15 4 5.1 8150 9T58W1805G07240 x 480 Volts 120/240 Volts 0.20 4 5.8 8175 9T58W1806G07240 x 480 Volts 120/240 Volts 0.25 4 6.5 8200 9T58W1807G07240 x 480 Volts 120/240 Volts 0.30 4 6.5 8200 9T58W1808G07240 x 480 Volts 120/240 Volts 0.375 4 7.6 8250 9T58W1809G07240 x 480 Volts 120/240 Volts 0.50 4 10.7 10225 9T58W1810G07240 x 480 Volts 120/240 Volts 0.75 4 12 12225 9T58W1811G07240 x 480 Volts 120/240 Volts 1 4 16.1 12300 9T58W1812G07240 x 480 Volts 120/240 Volts 1.5 4 26.7 14225 9T58W1813G07240 x 480 Volts 120/240 Volts 2 4 32.7 14300 9T58W1814G07240 x 480 Volts 120/240 Volts 3 4 47.4 14475 9T58W1815G07600 Volts 120/240 Volts 0.10 5 3.6 8100 9T58W1824G07600 Volts 120/240 Volts 0.20 5 5.8 8175 9T58W1826G07600 Volts 120/240 Volts 0.30 5 6.5 8200 9T58W1828G07600 Volts 120/240 Volts 0.50 5 10.7 10225 9T58W1830G07600 Volts 120/240 Volts 1 5 26.7 14225 9T58W1832G07600 Volts 120/240 Volts 2 5 32.7 14300 9T58W1834G07600 Volts 120/240 Volts 3 5 47.4 14475 9T58W1835G07

50/60 Hz Leads Out Connection2Input Output Wiring Approx. Net Frame ProductVoltage Voltage kVA Diagram No.1 Weight (Lbs) Size Number

240x480 Volts 120/240 Volts 0.25 4 6.5 8200 9T58W1927G07240x480 Volts 120/240 Volts 0.30 4 7.6 8250 9T58W1928G07240x480 Volts 120/240 Volts 0.50 4 10.7 10225 9T58W1930G07240x480 Volts 120/240 Volts 0.75 4 16.1 12300 9T58W1931G07240x480 Volts 120/240 Volts 1.5 4 32.7 14300 9T58W1933G07240x480 Volts 120/240 Volts 3 4 47.4 14475 9T58W1935G07380/400/416 Volts 115/230 Volts 0.50 8 10.7 10225 9T58W1978G07380/400/416 Volts 115/230 Volts 0.75 8 16.1 12300 9T58W1979G07380/400/416 Volts 115/230 Volts 1 8 26.7 14225 9T58W1980G07380/400/416 Volts 115/230 Volts 1.5 8 32.7 14300 9T58W1981G07

1See page 61 for wiring diagrams.2Secondary fusing not available.

50/60 Hz Universal Voltage/Multitap Terminal Strip Connection

Frame ProductkVA Size Number

0.25 10225 9T58W37150.35 10225 9T58W37160.50 12225 9T58W37170.75 12300 9T58W37181 14225 9T58W37191.5 14300 9T58W37202 14475 9T58W3721

Voltage TableIncoming Voltage Output Voltage

H1 H2 H1 H3 H1 H4 H1 H5 X1 X2 X1 X3 X1 X4208 500 85 100 110

415 86 104 113220 380 440 550 91 110 120230 40 460 575 95 115 125240 416 480 600 99 120 130





Options and Fusing Guide

Transformer OptionsAccessory Description Product NumberJumper Links 9T58W0000G01Lead Kit (12 GA) SM (10" long) (6-8 fr) 9T58W0000G07Lead Kit (10 GA) LG (10" long) (10-14 fr) 9T58W0000G08(1) Quarter-Inch Fuseholder 9T58W0000G10(1) Midget Fuseholder 9T58W0000G20(1) H/K Fuseholder 9T58W0000G30(2) CC Fuseholder 9T58W0000G40(2) H/K Fuseholder 9T58W0000G50(2) CC + (1) Quarter-Inch Fuseholder 9T58W0000G60(2) CC + (1) Midget Fuseholder 9T58W0000G70(2) CC + (1) H/K Fuseholder 9T58W0000G80(2) CC Fuseholder 9T58W0000G40(2) CC + (1) Midget Fuseholder 9T58W0000G70

Fuse GuideMidget Class CC Rejection Fuse

Transformer Continuous Power Rating (VA)Primary 50 75 100 150 200 250 300 375 500Voltage Fuse Rating (Amperes)

100 1.50 2.00 3.00 4.00 3.00 4.00 5.00 6.00 8.00110 1.25 2.00 2.50 4.00 5.00 3.00 4.00 5.00 7.00120 1.25 1.60 2.50 3.00 5.00 3.00 4.00 5.00 6.00200 0.75 1.00 1.50 2.00 3.00 3.00 4.00 5.00 4.00208 0.60 1.00 1.25 2.00 2.50 3.00 4.00 5.00 4.00220 0.60 1.00 1.25 2.00 2.50 3.00 4.00 5.00 3.00230 0.60 0.80 1.25 1.60 2.50 3.00 3.00 4.00 3.00240 0.60 0.80 1.25 1.60 2.50 3.00 3.00 4.00 3.00277 0.50 0.80 1.00 1.60 2.00 2.50 3.00 4.00 5.00380 0.30 0.50 0.75 1.00 1.50 1.60 2.00 2.50 3.00400 0.30 0.50 0.75 1.00 1.50 1.60 2.00 2.50 3.00416 0.30 0.50 0.60 1.00 1.25 1.60 2.00 2.50 3.00440 0.30 0.50 0.60 1.00 1.25 1.60 2.00 2.50 3.00460 0.30 0.40 0.60 0.80 1.25 1.60 1.60 2.00 3.00480 0.30 0.40 0.60 0.80 1.25 1.50 1.60 2.00 3.00550 0.25 0.40 0.50 0.80 1.00 1.25 1.60 2.00 2.50575 0.25 0.30 0.50 0.75 1.00 1.25 1.50 1.60 2.50600 0.25 0.30 0.50 0.75 1.00 1.25 1.50 1.60 2.50

For motor control circuits fusing, refer to NEC 430-72.

Secondary Fuse SelectionGlass Fuse

Transformer Continuous Power Rating (VA)Secondary 50 75 100 150 200 250 300 375 500 750 1000 1500 2000 3000Voltage Fuse Rating (Amperes)

12 6.00 10.00 12.00 15.00 20.00 25.00 30.00 — — — — — —24 3.00 5.00 6.00 10.00 12.00 12.00 15.00 — 25.00 — — — — —36 2.00 3.00 4.00 6.00 8.00 10.00 12.00 — 15.00 — — — — —48 1.50 2.50 3.00 5.00 6.00 8.00 10.00 12.00 12.00 — — — — —95 0.80 1.25 1.60 2.50 3.00 4.00 5.00 6.00 8.00 12.00 15.00 20.00 25.00 —110 0.75 1.00 1.50 2.00 3.00 3.00 4.00 5.00 7.00 10.00 12.00 20.00 25.00 30.00115 0.60 1.00 1.25 2.00 2.50 3.00 4.00 5.00 7.00 10.00 12.00 20.00 20.00 30.00120 0.60 1.00 1.25 2.00 2.50 3.00 4.00 5.00 6.00 10.00 12.00 15.00 20.00 30.00208 0.40 0.60 0.80 1.00 1.60 2.00 2.00 3.00 4.00 6.00 8.00 12.00 15.00 20.00220 0.30 0.50 0.75 1.00 1.50 1.60 2.00 2.50 3.00 5.00 7.00 10.00 12.00 20.00230 0.30 0.50 0.60 1.00 1.25 1.60 2.00 2.50 3.00 5.00 7.00 10.00 12.00 20.00240 0.30 0.50 0.60 1.00 1.25 1.60 2.00 2.50 3.00 5.00 6.00 10.00 12.00 15.00




Machine Tool ApplicationsControlWiring Diagrams

Diagram 1

Diagram 2

Diagram 3

Diagram 4

Diagram 5

Diagram 6

Diagram 7

Diagram 8





Outlines and Dimensions6, 8, 10, 12 and 14 Frames

Terminal Board and Leads Out Connection StyleFrame Approx. Net A Depth B Width C Height E Mounting F Mounting MountingSize Outline Weight (Lbs.) (in.) (in.) (in.) Depth (in.) Width (in.) Slot (in.)

6100 303B957MW 2.4 3.75 3 2.65 2.16 2.5 .219x.7506125 303B957MW 2.8 4 3 2.65 2.41 2.5 .219x.7506150 303B957MW 3.1 4.25 3 2.65 2.66 2.5 .219x.7508100 303B957MW 3.6 4 3.75 3.28 2.16 3.13 .219x.7508150 303B957MW 5.1 4.5 3.75 3.28 2.66 3.13 .219x.7508175 303B957MW 5.8 4.75 3.75 3.28 2.91 3.13 .219x.7508200 303B957MW 6.5 5 3.75 3.28 3.16 3.13 .219x.7508250 303B957MW 7.6 5.5 3.75 3.28 3.66 3.13 .219x.75010225 303B957MW 10.7 5.62 4.5 3.9 3.38 3.75 .297x.58012225 303B957MW 12 5.88 5.25 4.53 3.38 4 .297x.58012300 303B957MW 16.1 6.62 5.25 4.53 4.12 4 .297x.58014225 303B957MW 26.7 6.5 6.75 5.78 3.38 5.5 .297x.58014300 303B957MW 32.7 7.25 6.75 5.78 4.12 5.5 .297x.58014475 303B957MW 47.4 9 6.75 5.78 5.88 5.5 .297x.580


Midwest Transformer Selection Guide

Application General Purpose

Ultra Efficient

K Factor (K=4)

K Factor (K=13)

K Factor (K=20)

K Factor (K=30)

Low Noise

AC or DC variable speed drives

Computer installations • •Critical care facilities • • •Data processing equipment circuits • •HID lighting •Hospital operating rooms • •Incandescent lighting • •Induction heaters •Instrumentation • •LEED projects •Maximum energy efficiency •Motor generators (without solid state drives) • •Motors • •Multiple receptacle circuits in heath care facilities •Office buildings • • •PLC & solid state controls •Production or assembly line equipment •Programmable controllers •Rectifier outputs

Resistance heating • •Schools & classroom facilities • • •SCR variable speed drives •UPS with optional input filtering •UPS without optional input filtering •Welders •X-ray equipment •

Midwest Electric Products41 Woodford Ave. Plainville, CT 06062www.midwestelectric.com

© 2013 Midwest Electric

MET-028 (12/13)

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Information provided is subject to change without notice. Please check all details with your local Midwest Electric manufacturer’s representative. All values are design or typical values when measured under laboratory condition, and Midwest makes no warranty or guarantee, express or implied, that such performance will be obtained under end-use conditions.

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