IS-limiter

2

3IS-limiterThe worlds fastestswitching device

l Reduces substation cost

l Solves short-circuit problems in newsubstations and substation extensions

l Optimum solution for interconnection ofswitchboards and substations

l In most cases the only technical solution

l Tried and tested in thousands ofinstallations

l Worldwide in service

l The peak short-circuit current will neverbe reached

l The short-circuit current is limited at thevery first current rise

4Current i = i1 + i2 at the short-circuit point

Single linediagram of a bustie for a systemwithI"k = 25 kAand with anIS-limiter

Short-circuit currents too high?The IS-limiter, a switching device with extremely short operating time, solves the problem.

A short-circuit downstream from an outgoing feederbreaker is assumed. The oscillogram shown belowindicates the course of the short-circuit currents inthe first half wave.A short-circuit current of 25 kA can flow to theshort-circuit point through any transformer. That istwice as much as the switchgear can withstand.The course of the current (i2) which flows through

the IS-limiter has been demonstrated in numerousshort-circuit tests is as shown below.It can be seen that the current i2 flowing through theIS-limiter, is limited so rapidly that it cannot contribu-te at all to the peak value of the short-circuit currenti1 + i2 at the short-circuit point. The switchgear istherefore at no point subjected to any higher thanthe permissible current.

i = i1 + i2without IS-limiter

Current i = i1 + i2at the short-circuit point

i = i1 + i2with IS-limiter

i

i1

i2

126 kA

63 kA

t

25 kA 25 kA

25 kA

k k

perm.k

5Questions and answers regarding the IS-limiter

2. Why does the peak short-circuitcurrent have to be limited?

Because otherwise insufficientlydimensioned switchboards, switches,current transformers, cables, etc. wouldbe destroyed by the dynamic effects ofthe current.

4. How does the IS-limiter work?

The IS-limiter consists of two parallelconductors. The main conductorconducts the high operating current (upto 5.000 A).After tripping, the parallel fuse limits theshort-circuit current during the firstcurrent rise (in less than 1 ms).

3. How can switchboards which are onlydimensioned for 2 x IK be operatedwith four transformers without anyrisk of overload and without losses?

By installing an IS-limiter between thebusbar sections 1 - 2 and 3 - 4. (This isonly one of the many possibilities forthe use of an IS-limiter. See page 18 forfurther examples.)

1. What is the peak short-circuit current?

The peak short-circuit current ipeak is themaximum instantaneous value of thecurrent after the short-circuit occurs.

pea

k

1 2 3 4

1 x I 2 x I 3 x I 4 x Ikkkk

Transformers: 1 + 2 1 + 2 + 3 1 + 2 + 3 + 41 t

4

321

Ik

II k k II k k

1 2 3 4

Due to the peak short-circuitcurrent the electrical system issubjected to mechanical stressescreated by magnetic forces.

Due to the AC short-circuit currentthe system is subjected to thermalstresses from electrical heat.

65. How is the main conductorinterrupted in less than a thousandthof a second?

Mechanical stored energy systemscannot interrupt a circuit of e.g. a ratedcurrent of 2000 A in such a short time.We use a small charge.

1. Current transformer(detects the short-circuit current)

2. Measuring and tripping device(measures the current and providesthe triggering energy)

3. Pulse transformer (converts thetripping pulse to busbar potential)

4. Insert holder with insert(conducts the operating current andlimits the short-circuit current)

7. Can IS-limiter inserts be refurbishedafter interruption of a short-circuit?

Yes! They can be refurbished at themanufacturers works. The costs are low.The opened main conductor, the paral-lel fuse and the charge are replaced. Allother parts can be re-used.

6. What overvoltages occur as aresult of the sudden interruption ofthe current?

8. Does the IS-limiter trip on everyshort-circuit?

No! The IS-limiter only trips when thesystem is at risk.Small short-circuit currents areinterrupted by the circuit-breakers.

t

1

2

3

4

The main conductor is suddenlyinterrupted, but not the entire currentpath. On separation of the mainconductor, the current flows through thefuse, which interrupts the current. Theovervoltage occurring on interruptionby the fuse is considerably belowthe permissible levels set down inIEC 282-1/VDE 0670 Part 4.

Short-circuitcurrent limited bythe fuse element

712. What currents can the IS-limiterinterrupt?

Tests at KEMA to date havedemonstrated

12 kV 210 kARMS

17.5 kV 210 kARMS

24 kV 140 kARMS

36/40.5 kV 140 kARMS

11. How often does an IS-limiter trip?

Experience shows that an IS-limiter tripsonce every four years on average,applied to 2500 IS-limiters in service.

10. What experience is available with theoperation of IS-limiters?

Since the invention of the IS-limiter byABB Calor Emag in 1955, severalthousand devices have been successfullyused in DC, AC and particularly in threephase systems.We can look back on 45 years of goodoperating experience worldwide. Moreand more customers are selecting theIS-limiter when they need high short-circuit currents to be safely limited andelectrical systems and distributionnetworks to be economically built orexpanded.

The function and applications of theIS-limiter are explained in the followingpages with numerous examples. Discussyour short-circuit problems with us. Wealways find a commercially interestingand technically elegant solution with theIS-limiter.

9. How does the IS-limiter distinguishbetween minor and serious short-circuits?

The measuring and tripping device ofthe IS-limiter detects the instantaneouscurrent level and the rate of current rise.The IS-limiter only trips when both setresponse values are reached.

The rate of current rise ( ) is high with high short-circuit currents is low with low short-circuit currents

didt

8The function of the IS-limiter

uneconomical for the user. Theuse of IS-limiters reduces theshort-circuit current in newsystems and expansions toexisting systems, thus savingcost.Circuit-breakers cannot provideany protection against undulyhigh peak short-circuit currents,as they are too slow. Only theIS-limiter is capable of detectingand limiting a short-circuitcurrent at the first rise, i.e. inless than 1 ms. The maximuminstantaneous current occurringremains well below the level ofthe peak short-circuit current.

In comparison with complexconventional solutions, theIS-limiter has both technical andeconomic advantages whenused in transformer or genera-tor feeders, in switchgear sectio-nalizing and connected inparallel with reactors.The IS-limiter is in every regardthe ideal switching device tosolve the short-circuit problemsfor switchgear in power stati-ons, in heavy industry and atutilities.

The rising demand for energyworld-wide requires morepowerful or additional transfor-mers and generators, and anincreasing interconnection ofthe individual supply networks.This can lead to the permissibleshort-circuit currents for theequipment being exceeded andthus parts of the equipmentbeing dynamically or thermallydestroyed.The replacement of existingswitchgear and cable connec-tions by new equipment withhigher short-circuit strength isoften technically impossible or

IS-limiter connected in parallel with a reactor fixed mounted

97

8

910

11

4

12

1

23

4

5

6

Design

The operation of the clampingdevice will be done with twolevers. Only for insert holderIr 2500 A and 12 kV/17.5 kVthe insert are fixed with twobolts.

Pulse transformer

The location of the pulse trans-former depends on the ratedvoltage: for 17.5 kV, in the lower

insulator 6 only, for 24/36 kV, in the upper

and lower insulators.The pulse transformer transmitsthe tripping pulse from thetripping device (Figure 3) tothe charge 10 in the IS-limiterinsert, and at the same time

IS-limiters for three-phase sy-stems basically consist of: three IS-limiter insert holders, three IS-limiter inserts, three tripping current trans-

formers, a measuring and tripping

device.

IS-limiter insert holders

The IS-limiter insert holdercomprises: base plate 1, insulator 2, insulator with pulse transfor-

mer 6 and telescopic contact5,

pole heads with clampingdevice 3 for the reception ofthe IS-limiter insert.

Figure 2: IS-limiter insert

4 Fuse7 Fuse indicator8 Insulating tube9 Bursting bridge10 Charge11 Main conductor indicator12 Fuse element

Figure 1: IS-limiter insert holderwith insert for 12 kV, 2000 A

1 Base plate2 Insulator3 Pole head with clamping device4 Fuse5 Telescopic contact6 Insulator with pulse

transformer

ensures electrical isolation ofthe tripping device from thecharge which is at systempotential.

IS-limiter insert

The IS-limiter insert is the swit-ching element proper. In asturdy insulating tube 8, theinsert contains the main con-ductor, designed as a burstingbridge 9, which encloses acharge 10. On tripping, thischarge is triggered and the mainconductor opens at the rupturepoint.

10

The current commutates to theparallel high rupture capacityfuse 4. The fuse element 12 inthe HRC fuse melts, thus limitingthe further current rise. Thecurrent is interrupted at the nextvoltage zero passage.

Tripping current transformer

The tripping current transformersare used to measure the currentflowing through the IS-limiter.They are located directly inseries with the IS-limiter.The IS-limiter current transformeris externally identical to a con-ventional current transformerand is designed as a post orbushing type current trans-former. Its remarkable featuresare: an extremely high overcurrent

factor, an iron core with air gap to

keep the remanent inductionlow

a low impedance shield bet-ween the primary and secon-dary winding.

Measuring and tripping device

The measuring and trippingdevice is accommodated ina sheet steel control cabinet(Figure 3) or in the low voltagecompartment of the IS-limiterpanel.The functional groups within thecontrol cabinet or low voltagecompartment are combined suchas to form replaceable units andare partly mounted on hingedframes.The measuring and trippingdevice includes: a power unit to provide the

necessary auxiliary DC volta-ges, a main switch whichallows the tripping system tobe switched on and off at any

time, and additionally amonitoring module,

one tripping unit for eachphase, which monitors thecurrent flowing in the rele-vant phase and on trippingprovides the energy fortriggering of the charge in thecorresponding IS-limiterinsert,

an indication unit with fiveflag indicator relays: one relay per phase for trip

signalling, one relay for monitoring

of readiness for operation, one relay for monitoring

of the supply voltages, an anti-interference unit to

protect the measuring andtripping assemblies frominterference pulses from the

outside, which could possib-ly cause malfunction. Theconnecting wires from themeasuring and trippingdevice to the current transfor-mers, to the IS-limiter insertholders and to the AC voltagesupplies are routed via theanti-interference unit.

Figure 3: Measuringand trippingdevice

Width (W) : 600 mm

Height (H) : 1450 mm

Depth (D) : 300 mm

Weight : 100 kg

H

D

W

11

The IS-limiter consists in prin-ciple of an extremely fastswitch, able to carry a highrated current but having a lowswitching capacity, and a highrupturing capacity fuse arrangedin parallel. In order to achievethe desired short opening time,a small charge is used as theenergy store for opening of theswitch (main conductor).When the main conductor isopened, the current continuesto flow through the parallelfuse, where it is limited within0.5 ms and then finally inter-rupted at the next voltage zeropassage.The current flowing throughthe IS-limiter is monitored by anelectronic measuring andtripping device. At the veryfirst rise of a short-circuit

Function of the IS-limiter

current, this device decideswhether tripping of theIS-limiter is necessary. In orderto reach this decision, theinstantaneous current and rateof current rise at the IS-limiterare constantly measured andevaluated. When the setpointsare simultaneously reached orex-ceeded, the IS-limiter trips.The three phases are operatedindependently of one another.The loss-free conduction of ahigh operating current on theone hand and the limitation ofthe short-circuit current at thefirst current rise on the otherhand are made possible bydistributing these two functionsof the IS-limiter between twoconductors. In comparison withreactors, the IS-limiter avoidsvoltage drops and does not

contribute to the peak short-circuit current.

Power unit

A DC voltage of 150 V genera-ted in the power unit is used asthe charging voltage for thetripping capacitors and at thesame time as the supply voltagefor the electronics. As far asnecessary, the supply voltage isdivided and stabilized withinthe individual assemblies. Awatchdog module in the powerunit constantly monitors themost important functions of thethree tripping units.

+150 V

Powerunit

G 1 A 2 L1 A 2 L3A 2 L2

H 1L2 H 1L3H 1L1H 106 H 116IS-limiternot ready

Phase L1tripped

Phase L3tripped

Phase L2tripped

Anti-interference unit A 3

F 116

L 1 L 2 L 3

Q 6 L 1 T1 L1 Q 6 L 3 T1 L3Q 6 L 2 T1 L2

A 4

U

Trippingunit

phase L1

Trippingunit

phase L2

Trippingunit

phase L3

Figure 4: Schematic diagram of the IS-limiterequipment

G1 Power unitA2 Tripping unitsA3 Anti-interference unitA4 Indication unitF116 Miniature circuit-breaker

for supply voltageQ6 IS-limiter

(insert holder and insert)T1 IS-limiter tripping transformer

12

Tripping unitThe current supplied by thetripping transformers for thecorresponding phases is moni-tored in the tripping units. Thethree tripping units work inde-pendently of each other.Both the rate of current rise andthe instantaneous current valueare used as criteria for tripping.

T2

R4

R1

R2

R3

R65

10

R5

144

Triggerpulseemitter

Measuringelement 1

+150 V15

7

6

3

2

1

L1Measuringelement 2

C1T3

RZ

Test socketconnector

T1

RS

Figure 5: Schematic diagram of a measuringand tripping unit

T1 IS-limiter trippingtransformer

T2 Intermediatetransformer of thetripping unit

T3 Pulse transformerL1 Measuring inductanceR1 .. R6 Setting resistorsC1 Tripping capacitorRS Discharge resistorRZ Charge

Both variables are convertedinto proportional voltages andsupplied via logical gates to anelectronic measuring element.The latter provides an outputsignal when the rate of currentrise and the instantaneouscurrent value have both simul-taneously reached the responsevalue of the measuring element.

The output signal from themeasuring element then activa-tes a thyristor, which dischargesa capacitor via the pulse trans-former in the IS-limiter insertholder to the charge. At thesame time, this discharge exci-tes the corresponding flagindicator relay "IS-limiter trip-ped" in the indication unit.

13

Testing the IS-limiter

As with every other protectivedevice, IS-limiters should also bechecked at regular intervals.There are special testing setsavailable for those tests whichcan be performed by the opera-tor or by ABB Calor Emag.These test sets consist of a testequipment and a test insert or atest plug and a test insert.The test plug is used to check

the voltages and the functionsof the tripping system.The user friendly test equip-ment facilitates further testssuch as determination of theresponse voltages of the measu-ring elements, and testing andsetting of the modules of themeasuring circuits.

During testing, the IS-limiterinsert is replaced by the testinsert. The test insert contains aneon lamp as an indicator,which lights up when a trip-ping pulse is received.

Figure 6: IS-limiter insert holder with test insert Figure 7: Test plug

Figure 8: Test equipment

Width (W) : 400 mm

Height (H) : 215 mm

Depth (D) : 320 mm

Weight : 11 kg

H

D

W

14

Rated voltage V 750 12000 12000

Rated current A 1250/2000/3000/4500/50001) 1250/2000 2500/3000/40001)

Rated power-frequencywithstand voltage kV 3 28 28

Rated lightning impulsewithstand voltage kV - 75 75

Interruptingcurrent kARMS up to 140 up to 210 up to 210

IS-limiterinsert holder kg 23/27.5/42/78 23/27.5 65

IS-limiterinsert kg 10/10.5/11/14 12/12.5 15.5

IS-limiter Width W mm 180/206/246 180 180insert holder Height H mm 637/651/754/1000 637/651 951with insert Depth D mm 493/500/420/460 503/510 509

1) With cooling fan

Frequency: 50/60 Hz

For higher rated currents, insert holders with inserts are connected in parallel.

The range

Technical data

A. IS-limiter as loose equipmentsupply

In this case the insert holders,the inserts and the trippingcurrent transformers areinstalled in an already exis-ting panel. The equipmentsupply generally comprises: three insert holders, three inserts, three tripping current

transformers, one measuring and trip-

ping device (Figure 3).t

H

t

t

t

Wt

tD

15

17500 17500 24000 36000/40500

1250/2000 2500/3000/40001) 1250/1600/2000/30001) 1250/2000/25001)

38 38 50 75

95 95 125 200

up to 210 up to 210 up to 140 up to 140

23/27.5 65 27/31.5/33 60

14/14.5 17.5 19/19.5/24 42

180 180 180 240 637/651 951 740/754/837 1016 503/510 509 553/560/560 695

16

B. Truck mounted IS-limiter in a switchgear panel

The IS-limiters can also be installed in a metal-cladswitchgear panel. The withdrawable truck with thethree IS-limiter insert holders and inserts has the

function of a disconnector. The three trippingcurrent transformers are fixed mounted in the paneland the measuring and tripping device is mountedin the low voltage compartment.

Truck mounted IS-limiter in a switchgear panel

17

IS-limiter panels with truck

C.Fixed mounted IS-limiter in a switchgear panel

The IS-limiters for low voltage, 12 kV, 17.5 kV and24 kV are also available as fixed mounted equip-ment in a metal-clad switchgear panel.The three IS-limiter insert holders with the IS-limiterinserts and the three tripping current transformersare fixed mounted in the panel.The measuring and tripping device is mounted inthe low voltage compartment.

The IS-limiter (fixed mounted) for 36 kV/40.5 kVis available in a metal-enclosed switchgear panel.Same as for loose equipment supply, the measuringand tripping device is installed in a separate sheetsteel cabinet (Figure 3).

For all fixed mounted IS-limiters the electrical dataare the same as for loose equipment supply.Dimensions and weights on request.

1) With cooling fan.

For higher currents, insert holders with inserts are connected in parallel.

Rated Rated Rated Rated Dimensions Weightvoltage current power-frequency lightning impulse including

withstand voltage withstand voltage IS-limiter truck

kV A kV kV Height Width Depth kgmm mm mm

12 1250 28 75 2200 1000 1300 approx. 1200

2000

2500

30001)

40001)

17.5 1250 38 95 2200 1000 1300 approx. 1200

2000

30001)

40001)

24 1250 50 125 2325 1000 1500 approx. 1300

1600

2000

25001)

18

IS-limiters in systeminterconnections

IS-limiters are frequently used ininterconnections betweensystems or in bus sectionswhich would not be adequatelyshort-circuit proof when con-nected by a circuit-breaker.Each partial system should haveat least one incoming feeder, sothat power supply to eachpartial system can be maintai-ned on tripping of the IS-limiter(Figure 9).There is a large number ofadvantages for the operationunder normal conditionsof bus sections connected byIS-limiters: Reduction of the series

network impedance. Thevoltage drops caused by loadsurges (e.g. of starting ofmotors) can be significantlyreduced.

Applications

Improvement of the currentdistribution at the feedertransformers.

The load dependent losses ofthe feeder transformers arereduced.

Increased reliability of thepower supply. On failure ofone feeder transformer, theload is taken over by theother feeder transformerswithout current interruption.The cost for an otherwiserequired new switchboardwith higher short-circuitcapacity will be saved.

If a short-circuit occurs within asystem or in an outgoing feeder,the IS-limiter trips at the first riseof the short-circuit current anddivides the busbar system intotwo sections before the instanta-neous current reaches an inad-missible high level. After trip-ping of the IS-limiter, the

short-circuit is only fed by thetransformer in the part of thesystem affected by the short-circuit. The short-circuit currentis now selectively interruptedby the circuit-breaker.A remarkable advantage of theuse of an IS-limiter is that thevoltage in the part of the systemnot affected by the short-circuitonly drops for a fraction of amillisecond so that even sensiti-ve loads (e.g. computers)remain protected from drops inthe system voltage.For this reason the IS-limiter canalso excellently be used as areliable switchgear suitablebetween an unprotected anda protected switchboard orsection of a switchboard.

Figure 9: IS-limiter in a bus section

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IS-limiters used as a linkbetween public networks andconsumer owned power supplysystems

The decentralization of powersupply leads to systems withtheir own power generatingfacilities being interconnectedwith public supply networks.The additional short-circuitcurrent from generators leads tothe permissible short-circuitcurrent in the utility networkbeing exceeded. The mostappropriate technical solution and mostly the only one isthe installation of anIS-limiter in the interconnectionwith the public utility network(Figure 10).If necessary, the IS-limiter can beprovided with a directionaltripping criterion. This requires

three additional current trans-formers in the neutral connec-tions of the generators. The IS-limiter then only trips onshort-circuits in the publicsupply network if a generator isin operation.

IS-limiter in parallel with areactor

The IS-limiter can also be con-nected in parallel with a reactor(Figure 11). If a short-circuitoccurs behind the reactor, theIS-limiter trips and the currentcommutates at the first currentrise to the parallel reactor,which then limits the short-circuit current to the permissi-ble level.For normal operation, the IS-limiter bridges the reactor coil.

This avoids: Current dependent copper

losses and the associatedoperating costs of the reactor.

Current dependent voltagedrop at the reactor, whichfrequently causes majordifficulties on start-up of bigmotors.

Control problems with thegenerator.

Figure 10: IS-limiter in connecting point witha public supply network

Figure 11: IS-limiter in parallel with a reactor ina generator feeder

10 kV3 ~ 50 Hz I" = 25 kA

I" = 15 kA

I" = 16 kAk perm

kT

k perm

I" = 3 kAkGI S

~

20

Use of more than one IS-limiterwith selectivity

In order to achieve selectivity ina switchboard or switchboardswith more than one IS-limiterinstalled, additional trippingcriteria as current summation ordifferences or comparison ofcurrent directions are required.If in case of two IS-limitersinstalled in a switchboardselective tripping is required, ameasurement of the total cur-rent becomes necessary.The IS-limiter trips as follows: Short-circuit in section A:

Only IS-limiter no. 1 trips. Short-circuit in section B:

IS-limiter no. 1 and no. 2 trip. Short-circuit in section C:

Only IS-limiter no. 2 trips.For measurement of the totalcurrent, transformer feeders

must be additionally equippedwith one CT set each. The totalcurrent Isum1 is equal to thecurrent (IT1) of transformer T1plus the current (IIs-1) flowingthrough the IS-limiter 1.The total current Isum2 is equal tothe current of transformer T2plus the currents flowingthrough IS-limiter 1 and 2.The total current Isum3 is equal tothe current of transformer T3plus the current flowing throughIS-limiter 2.The tripping criteria of theIS-limiters correspond to a logicand function. The IS-limiter 1trips in case of short-circuits insection A, if the current ofIS-limiter 1 and the total currentIsum1 reach or exceed theirresponse values simulaneously.The same is applicable forsection C. In case of a short-

circuit in section B IS-limiters1 and 2 trip.The summation of the currentscorresponds to the principle ofthe adding up of currents in abusbar protection system. Theonly difference is the non-requirement of current transfor-mers in the outgoing feeders,i.e. the requirement of materialis negligable. With this principleup to 5 transformers have so farbeen connected in parallel,using 4 IS-limiters only. Theprinciple ensures that alwaysonly the IS-limiter or theseIS-limiters trip, which are closestto the point of short-circuit.

Figure 12: Schematic diagram-IS-limiterwith summation of currents

21

Please send by mail or fax +49/2102/121922 to:

ABB Calor EmagMittelspannung GmbHPostfach 10 12 20

D-40832 Ratingen

Sender:

Questionnaire on the use of IS-limiters in medium andlow voltage three-phase systems

We require the following data for a quotation and design of an IS-limiter

Rated capacity of capacitor banks and theinductance in series connected to thesame voltage level the IS-limiter is installed.

Rated power of the biggest transformer,energised from the same voltage levelwhere the IS-limiter is located.

Single Line Diagram.

5. Which parts of the system should beprotected?Please note that more than one IS-limiter canbe installed in one system and we can realiseselectivity between IS-limiters.

6. Requirements for the installation: It must be possible to insulate the IS-limiter to

that the IS-limiter insert can be replaced aftertripping.

There must be a circuit breaker in series withthe IS-limiter (except the IS-limiter is in parallelto a reactor).

1. Operating Voltage:

2. Rated Current:

3. Frequency:

4. In order to calculate the tripping and settingvalues we need: Single line diagram of the installation with the

following data: Initial symmerical short-circuit current IK of

generators, transformers, the grid, motorcontribution and the permissible short-circuit current of the switchboard.

Rated power of motors over 2 MWconnected to the same voltage level theIS-limiter is installed.

22

7. We are able to deliver the IS-limiter in differentdesigns. Which design do you need?

IS-limiter as loose delivered components forinstallation in a cubicle of your own designIS-limiter in a cubicle type ZS1, truckmounted (up to 24 kV)IS-limiter in a cubicle type ZS1, fixedmounted (up to 24 kV)IS-limiter in a cubicle type ZE, fixedmounted (25 to 40.5 kV)

8. The IS-limiter tripping device needs threeauxiliary voltage supplies:a) two independent AC supplies (50 or 60 Hz,

power consumption max. 40 VA). Main supply should be taken from the

system to be protected via voltagetransformer.

Stand-by supply e.g. from lighting grid(independent from first!).

b)one supply voltage (AC or DC) forannunciation purposes (power consumptionmax. 20 VA).

Which AC voltages are available?

as main supply:

V Hz

as stand-by supply:

V Hz

Which voltage for annunciation is available?

V DC; AC;

9. Remarks:

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ABB Calor Emag Mittelspannung GmbH

Oberhausener Strasse 33 Petzower Strasse 8D-40472 Ratingen D-14542 Glindow

Phone: +49(0)21 02/12-12 30, Fax: +49(0)21 02/12-19 16E-mail: calor.info@de.abb.comInternet: http://www.abb.de/calor