9-68

For more information contact Cutler-Hammer: www.ch.cutler-hammer.com/catalog CAT.200.01.T.E

January 2001

Transformers

9

Buck-Boost TransformersSingle- and Three-Phase Applications, 60 Hz

Vol. 1, Ref. No. [0352]

Table 9-85. Selection InformationkVA °C Temp.

RiseDimensions (Inches) Weight

Lbs.Dimensions (mm) Weight

KgFrame Catalog

NumberPriceU.S. $H W D H W D

120 x 240 Volts to 12/24 Volts.05.10.15

115115115

6-1/26-1/26-1/2

3-7/83-7/83-7/8

3-1/23-1/23-1/2

778

165165165

989898

898989

334

525455

S10N04A81NS10N04A82NS10N04A83N

129.158.184.

.25

.50

.75

115115115

6-1/26-1/28-3/8

4-7/84-7/86

3-7/84-5/85-3/4

121321

165165213

124124152

98117146

5510

565758A

S10N04A26NS10N04A51NS10N04A76N

231.254.337.

11.52

115115115

8-3/810-3/410-3/4

66-3/166-3/16

5-3/46-1/86-1/8

314040

213273273

152157157

146156156

141818

59A6768

S10N04A01NS10N04A16NS10N04A02N

441.610.750.

357.5

115115115

14-1/81616

7-11/1610-3/810-3/8

89-7/89-7/8

65113123

359406406

195263263

203251251

295155

176177178

S10N04A03NS10N04A05NS10N04A07N

1,125.1,260.1,575.

120 x 240 Volts to 16/32 Volts .05.10.15

115115115

6-1/26-1/26-1/2

3-7/83-7/83-7/8

3-1/23-1/23-1/2

778

165165165

989898

898989

334

525455

S10N06A81NS10N06A82NS10N06A83N

129.158.184.

.25

.50

.75

115115115

6-1/26-1/28-3/8

4-7/84-7/86

3-7/84-5/85-3/4

121321

165165213

124124152

98117146

5510

565758A

S10N06A26NS10N06A51NS10N06A76N

231.254.337.

11.52

115115115

8-3/810-3/410-3/4

66-3/166-3/16

5-3/46-1/86-1/8

314040

213273273

152157157

146156156

141818

59A6768

S10N06A01NS10N06A16NS10N06A02N

441.610.750.

357.5

115115115

14-1/81616

7-11/1610-3/810-3/8

89-7/89-7/8

65113123

359406406

195263263

203251251

295155

176177178

S10N06A03NS10N06A05NS10N06A07N

1,125.1,260.1,575.

240 x 480 Volts to 24/48 Volts.05.10.15

115115115

6-1/26-1/26-1/2

3-7/83-7/83-7/8

3-1/23-1/23-1/2

778

165165165

989898

898989

334

525455

S20N08A81NS20N08A82NS20N08A83N

142.174.200.

.25

.50

.75

115115115

6-1/26-1/28-3/8

4-7/84-7/86

3-7/84-5/85-3/4

121321

165165213

124124152

98117146

5510

565758A

S20N08A26NS20N08A51NS20N08A76N

254.278.371.

11.52

115115115

8-3/810-3/410-3/4

66-3/166-3/16

5-3/46-1/86-1/8

314040

213273273

152157157

146156156

141818

59A6768

S20N08A01NS20N08A16NS20N08A02N

485.665.830.

357.5

115115115

14-1/81616

7-11/1610-3/810-3/8

89-7/89-7/8

65113123

359406406

195263263

203251251

295155

176177178

S20N08A03NS20N08A05NS20N08A07N

1,230.1,380.1,735.

Discount Symbol . . . . . . . . . . . . . . . . . . . . . . . . . DT-1

472_09.fm Page 68 Monday, November 20, 2000 9:37 AM

CAT.200.01.T.E For more information contact Cutler-Hammer: www.ch.cutler-hammer.com/catalog

9-65January 2001

Transformers

9

Buck-Boost TransformersSingle- and Three-Phase Applications, 60 Hz

Vol. 1, Ref. No. [0349]

Single- and Three-Phase Applications, 60 Hz

Type EP

Product Description

Types EP, EPT■ Sand and Resin Encapsulated design■ Suitable for indoor or outdoor

applications■ Totally enclosed, non-ventilated

enclosures■ Enclosures are NEMA 3R rated■ Mountable in any position indoors

and upright only outdoors■ 185ºC Insulation System, 115ºC rise

standard■ Available in ratings through 37.5

kVA and 4160 volts primary (EP)■ Available in ratings through 75 kVA

and 4160 volts primary (EPT)

Application DescriptionA buck-boost transformer is used to provide an economical method of correcting a lower or higher voltage rating more suitable for efficient oper-ation of electrical equipment. Type EP Buck-Boost transformers are small kVA, single-phase transformers with dual primary and dual secondary windings and are usually connected as autotransformers by utilizing one unit for single-phase applications and either two or three units banked for three-phase operation. They are pri-marily used for motor operation and should not be used for motor control circuits, to correct fluctuating line voltage or to obtain a neutral on a delta system.

Features, Benefits and Functions■ UL Listed■ 60 Hz operation■ 600 volt class insulation■ Short-term overload capability as

required by ANSI■ Meet NEMA ST-20 sound levels

Standards and CertificationsIndustry StandardsAll Cutler-Hammer dry type distribution and control transformers are built and tested in accordance with applicable NEMA, ANSI, and IEEE Standards. All 600 volt class transformers are UL listed unless otherwise noted

Seismic QualifiedAll Cutler-Hammer dry type distribution transformers are seismically qualified, and exceed requirements of the Uniform Building Code (UBC) and California Code Title 24.

Options and AccessoriesPlease refer to Page 9-112.

Product SpecificationsFrequencyCutler-Hammer buck-boost trans-formers are designed for 60 Hertz operation.

Overload CapabilityShort-term overload is designed into transformers as required by ANSI. Dry type distribution transformers will deliver 200% nameplate load for one-half hour; 150% load for one-hour; and 125% load for four-hours without being damaged provided that a con-stant 50% load precedes and follows the overload. See ANSI C57.96-01.250 for additional limitations.

Continuous overload capacity is not deliberately designed into a trans-former because the design objective is to be within the allowed winding tem-perature rise with nameplate loading.

Insulation System and Temperature RiseIndustry standards classify insulation systems and rise as shown below:

Table 9-83. Insulation System Classification

The design life of transformers having different insulation systems is the same — the lower temperature systems are designed for the same life as the higher temperature systems.

EnclosuresCutler-Hammer encapsulated buck-boost transformers utilize a NEMA 3R rated enclosure.

Sound LevelsAll Cutler-Hammer 600 volt class general purpose dry type distribution transformers are designed to meet NEMA ST-20 levels listed here.

Table 9-84. Sound Levels

1 Applies to general purpose transformers only.

Winding TerminationsPrimary and secondary windings are terminated in the wiring compartment. Encapsulated units have copper leads or stabs brought out for connections. Lugs are not supplied with these transformers. Cutler-Hammer recom-mends external cables be rated 90°C (sized at 75°C ampacity) for encapsu-lated designs.

Ambient + WindingRise

+HotSpot

=Temp. Class

40°C40°C40°C40°C

55°C80°C115°C150°C

10°C30°C30°C30°C

105°C150°C185°C220°C

kVA NEMA Average 1

Sound Level in dB

0 – 910 – 5051 – 150151 – 300

40455055

301 – 500501 – 700701 – 10001001 – 1500

60626465

472_09.fm Page 65 Monday, November 20, 2000 9:37 AM

9-122

For more information contact Cutler-Hammer: www.ch.cutler-hammer.com/catalog CAT.200.01.T.E

January 2001

Transformers

9

Vol. 1, Ref. No. [0406]

Catalog Numbering SystemTable 9-152. General Purpose, Energy Efficient, Mini-Power Center, Shielded Isolation, Non-Linear, Buck-Boost, Marine Duty Transformers — Example: S20N11S05A

1 Copper Windings.2 Stainless Steel (utilizes 316 stainless steel, does not imply a NEMA 4X rating).3 Open Type Core and Coil Assembly.4 Totally Enclosed Non-Ventilated DS-3 or DT-3.5 50/60 Hz.6 Low Sound Design.7 Fungus Proof.8 Certified test report of standard production tests.9 Certified sound level report.j Model number is not used on newly designed/redesigned transformers.Note: For the Cutler-Hammer Industrial Control Transformers Catalog Numbering System see Page 9-124.Note: Contact your local Cutler-Hammer sales office for voltage combinations not shown. Use table for catalog number breakdown only.

Type

S = EPY = EPTT = DS-3V = DT-3P = Mini-Power

Center

Non-LinearH = KT-4B = KT-9N = KT-13G = KT-20J = KT-30A = KT-40K = KT-50

Q = EPM MarineL = EPTM MarineR = DS-3M MarineM= DT-3M MarineZ = Class 1 Division 2

Groups C and D

Primary Voltage

13 = 110 x 22012 = 12010 = 120 x 24029 = 20872 = 20025 = 22023 = 23024 = 24020 = 240 x 48027 = 27738 = 38039 = 40043 = 41644 = 44045 = 45048 = 48057 = 57560 = 60042 = 240046 = 416049 = 480040 = Export Model

Taps

D = +2 – 2.5%, -2 – 2.5%E = +1 – 5%, - 1 – 5%F = -1 – 10%G = -2 – 5%J = -4 – 2.5%K = -1 – 10% x -2 – 5%L = -2 – 5% x -4 – 2.5%M = +2 – 2.5%, -4 – 2.5%N = NoneR = +1 – 5%, -2 – 5%P = +1 – 5%, -2 – 5% x

+2 – 2.5%, -4 – 2.5%T = +1 – 4.2%, -1 – 4.2%U = +1 – 2.5%, -3 – 2.5%W = +1 – 3.5%, -1 – 3.5%X = +2 – 3.1%, -2 – 3.1%

Secondary Voltage

04 = 12/2406 = 16/3208 = 24/4814 = 110/22012 = 12010 = 120 x 24011 = 120/24054 = 127/25419 = 190Y/11028 = 208Y/12029 = 20825 = 220 Delta31 = 220Y/12726 = 220∆/110 Midtap22 = 240∆/120 Midtap64 = 240Y13924 = 240 Delta20 = 240 x 48021 = 240/48027 = 27738 = 380 Delta37 = 380Y/22034 = 400Y/23151 = 416Y/24035 = 440Y/25462 = 460Y/26647 = 480Y/27748 = 480 Delta60 = 600 Delta61 = 600Y/34642 = 240041 = 4160Y/240046 = 416049 = 4800

Phase

S = SingleT = ThreeE = Electrostatic ShieldA= Buck and BoostF = 115°C RiseB = 80°C Rise

Model j

A...Z

CU 1

SS 2

ZZ 3

NV 4

X 5

LS_ _ 6

AF 7

TR 8

SR 9

kVA

81 = .0585 = .07582 = .1083 = .1526 = .2551 = .5076 = .7501 = 116 = 1.502 = 203 = 305 = 506 = 607 = 7.509 = 910 = 1015 = 1521 = 22.525 = 2530 = 3037 = 37.545 = 4550 = 5075 = 7599 = 10012 = 112.549 = 15067 = 16722 = 22552 = 25033 = 30054 = 33355 = 50060 = 60077 = 75011 = 100014 = 1500

S 20 N 11 S 05 A

472_09.fm Page 122 Monday, November 20, 2000 9:37 AM