Molded case circuit breakers

Compact” CM1250-2500 A

Catalog

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SQUARE Dm GROHPE SCHNEIDER

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V' •Compact CM circuit breakertable of contents

page '

molded case circuit breakerintroductionstandard complianceperformanceother performancesratingsinterrupting capability

222222

advantages2description3trip unit characteristics

ST 206DST 306S - ST316Sneutral sensorportable test kittest procedure

45666

time current curvesST 206D (overcurrent protection)ST 306S - ST 306ST - ST 316ST (overcurrent protection)ST 306ST(ground faultprotection)ST 316ST(ground fault protection)

789

10accessoriesterminalslocationshunt tripundervoltage trip deviceauxiliary andalarm switchesovercurrent trip switchmotor operatorOFF position locking

1111121212121313wiring diagrams 14

molded case switch 15constructionratingsaccessories -dimensions-installation

151515

dimensions 16

appendixUL 489 test proceduresapplication of 100% rated breakersroutine and maintenance guidelinesinternational standards

20212223

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1MERLIN GERIN

y; .Compact CM circuit breakerintroduction, advantages

interrupting ratingsstandard complianceCM breakers are built in accordance withUnderwriters Laboratories standard UL 489.The circuit breaker and its accessories,except when noted, are listed under UL fileE63335.

ampere ratingscurrent sensors

UL listed interrupting ratingsRMS Symmetrical. Amps

480V

CM type3-pole

(A) 240V 600V

standard rated breakerCM 1250 HE 1250 125,000 85,000 50,000performance

CM breakers are designed to meet orexceed UL 489 requirements.Standard tests:UL 489 standardsection 7.1 gives test values forcalibration, overload, temperature,endurance, interrupting ability, dielectric.On page 21 of this document, extracts ofUL standards are given.Additional tests:CM breakers meetUL 489 standard additional requirements:

high available fault current100% rating

as shown on page 21

CM 1600 HE 1600 125,000 85,000 50,000CM 2000 HE 125,000 85,0002000 50,000CM 2500 HE 2500 125,000 85,000 50,000

100% rated breakerCM1250HH 125,0001250 85,000 50,000CM 1600 HH 125,0001600 85,000 50,000CM 2000 HH 125,0002000 85,000 50,000CM2500HH 125,0002500 85,000 50,000

ratingsFour continuous current ratings:1250,1600, 2000 and 2500ATwo types are listed:other performances

The UL489 standard assures that thecircuit breaker has sufficient characteristicsto be usedin normal conditions.However,CMcircuit breakers exceed thestandardrequirements without additionalcost :in endurance : the heavy duty mechanismandcontact designprovidesamechanicalendurance of 10,000 operations andanelectricalendurance of 2,000cyclesin accuracy :the solid state trip unitprovides a more accurate protection thanrequired by the standard, see time currentcurves page7

standard rated circuit breakers100% rated circuit breakers

small dimensionsA unique and small insulating casing for allfive ratings (1250 to 2500A) simplifies layoutdesign and installation.

built-in control terminalblocksAre provided with the accessories,consequently intermediate terminals are notrequired for theconnection of control wiring.reverse feeding

maintenance freebreaker designreduces downtime and maintenance costs.

high endurancesThe endurance of the design is four timesgreater than that requiredby the standards.

isolation functionThe operating handle isrepresentativeofthe position of the maincontacts.The OFFposition canbe reached only when the maincontacts are fully opened.

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MERLIN GERIN2

Compact CM circuit breakerdescription

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2 3 14

1 three pole high strength glass polyestercasing2 auxiliary andalarm switches3 undervoltage trip device4 shunt trip5 motor operator6 ON-OFF indicator directly operatedbythe mechanism (optional with auxiliaryswitches)7 provisions for padlock, when contactsare actually opened8 handle extension9 push to trip button10 handle with three positions :ON-TRIPPED-OFF11 solid state trip unit12 overcurrent trip switch terminal block13 neutral sensor terminal block

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3MERLIN GERIN

Compact CM circuit breakertrip units

ST206Dfor general purpose

1 long time current setting2 instantaneous pickup3 mechanical fault trip indicator,pops outwhen thecircuit breaker trips through thetripunit.It indicates any electrical fault,asdoes the overcurrent trip switch describedon page 12.This indicator must be resetprior to resetting the circuit breakernote :a transparent cover is provided. It issecuredby two screws to prevent access tothe settings by unauthorizedpersonnel

*•• ....

V\ST 206D

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longtime .7*8.9*. *

.

1 m --:

^ -' 9%W&p$'

inwemwiism.

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current setting1 *.•.v

Vinstant.

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IgcWWM

IKflai

time ' :xlr

pick-up !

;long time setting :

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: ' - :'••• '1instantaneous : ' •- :•*

^trip indicator (push to reset)current

0• * • *' ;V:.-:C V

overcurrent protection0.5 to 1 x sensor ratingcurrent settinglong time3 to 6 x current settingpickupinstantaneous

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fault indicatorsby mechanical,pop-out type indicatorlocalby overcurrent trip switch - see page 12remote

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MERLIN GERIN4

Compact CM circuit breakertrip units

ST 306S - ST 316S

for selective applicationand ground fault protection

1 long time current setting2 short time pickup and delay3 ground fault pickup and delay4 test receptacle for use with portable testkit cat no.553915 mechanical fault trip indicator, pops outwhen the circuit breaker trips through thetrip unit. It indicates any electrical fault, asdoes the overcurrent trip switch describedon page 12.This indicator must be reset priorto resetting the circuit breaker,note: a transparent cover is provided. It issecured by two screws to prevent access tothe settings by unauthorized personnel

ST 306ST

longtime

7.8 Q

— 1xlnIr

current setting

" " ' : ::v .shorttime

.3.1 2x: 0

, : r '

Oi.xlr'v-.-v‘

pick-up delay• •••;

•T ° '-A,time groundfault

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mst.2i 3.1

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long time setting «««pai pick-up delay

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test

4-V

ootoooootomshort time pickupand delay mmmmm y trip indicator (push to reset)

© ——5ftcurrent

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overcurrent protectiontime

long time current setting 0.5 to 1 x sensor ratingshort time pickup 2 to 8 x current setting

delay 0-0.1 - 0.2 - 0.3 ©pickupinstantaneous override at 35.000Afor overcurrent and ground fault testingtest receptacle

ground fault protection ©(~) ground fault| pickup and delay

pickup(option T) ST 306ST © :0.2 to 0.5 x sensor ratingST 316ST © :0.2 to 0.4 x sensor rating

delay 0.1 - 0.2 - 0.3 - 0.4

• v*fault indicatorscurrent - : _ ; •*;

local by mechanicalpop-out type indicatorby overcurrent trip switch - see page 12remote

© The short time delay may be set at zero if instantaneoustripping is required© The maximum ground fault pickup of ST 316ST meets1996 National Electrical Code paragraph 230-95 (notto exceed 1200A).

>.V L-© Used on CM 1250 - CM 1600 and CM 2000@ Used on CM 2500

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5MERLIN GERIN

Compact CM circuit breakertrip Unit neutral sensor

neutral sensorportable test kit

neutral sensorGround fault protection may be appliedon304W or 303W circuits.On304W anexternal neutral sensor mustbe used.This neutral current sensor shall have thesame ampere rating as the breaker.The following are current sensorsfor use with CM breakers equippedwith ST 306ST or ST 316ST tripunits.

locationmain

breaker

O O

o o

Ifrating for cat no.Ill1250A

1600A2000A2500A

CM1250CM 1600CM2000CM 2500

55760557595575855757

neutral

wiringIt shall be as indicated in opposite fig. andon the neutral sensor label.Observe controlwiring (terminal S1-S2,T1-T2).terminals

terminals S1-S2(neutral sensor) are of"quick-connect" type (1/4" male tab terminalsare supplied with current sensors).

terminals T1-T2 (circuit breaker) arepressure type terminal blocks.Theseterminals are intended for usewith 18 to 14AWG strandedcopper wire.

SUT1) ) )

f44ground faultneutral CT’s feeder

breakerS2TT2

note:ground terminal T2or S2caution:in304W systems,do not connect or do not short terminals T1 and T2

portable test kitAll tests performed by the testkitarefunctional tests only designed to electricallytest the operating integrity of the trip unit,the flux transfer shunt trip and themechanicaloperation of the breaker. Testsare not designedas a check of the breakercalibration. Calibration tests can best bedone at the factory.

Complete test operating instructions andrequired setting details are given on the sideof the test kit. For convenience, theoperating instructions are repeated below.ST306S, ST306ST and ST316STtrip unitsare equipped with test points that can beused with the portable test kit.This test kit allows independent tests on thethree following protections :

long timeshort timeground fault on ST 306ST and ST 316ST

The portable test kit should be supplied by a120V 60Hz source.Catalog number 55391

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MERLIN GERIN6

Compact CM circuit breakertime current curves

overcurrent protection ST 206D

7MERLIN GERIN

Compact CM circuit breakertime current curves

overcurrent protection ST 306S - ST306ST - ST 316ST

MERLIN GERIN8

Compact CM circuit breakertime current curves

V .

ground fault protection ST 306ST

MERLIN GERIN 9

Compact.CM circuit breakertime current curves

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ground fault protection ST 316ST

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MERLIN GERIN10

Compact CM circuit breakeraccessories

terminals

Interna! accessories are field installable andcomply with requirements of UnderwritersLaboratories Standard UL 489 and are listedfor fileld installation per UL E103955.

terminalsAll internal accessories are equipped withpressure type terminals locatedon the sideof the breaker.Each terminal may be connectedby one ortwo copper wires 18 to 14AWG.The terminals comply with UnderwritersLaboratories StandardUL486A.Tightening torque: 12 Ib.in.

location

|ooo| |ooo| |ooo|

SLmotor[Operator

IEaux.switchaux. switchaux.switchaux.switchalarmswitch

5- n 4 aux.switchwith motoroperator

FIta I* aux.switch|— ^> oriaux.switchI»iaFIor *3 ±

£I-*4 PI } or !1 irw shunt trip undervottagetripu|ooo| |ooo[ ooo

overcurrent trip switch

for groundfault protection

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MERUN GERIN 11

Compact CM circuit breakeraccessories

shunt tripundervoltage trip deviceauxiliary and alarm switchesovercurrent trip switch

vratedvoltage (V)

inrushcurrent (A)

shunt tripThe shunt trip is intermitently ratedwithaseries normally open contact. AC shunt tripscanbeoperatedat 55percent of their ratedvoltage,making them suitable for use withground fault protection devices,minimum operating voltage :AC:55%of rated voltageDC :75 %of rated voltage

cat no.controlvoltaget

60 Hzi, wpft -C2

120 3.5 55740button

240 1.9 55741o480 1 55742

0.65600 55743DC24 10 55744

448 557451.8125 55746- So fA^ i

il

seal-incurrent (A)

ratedvoltage (V)

undervoltage trip deviceUndervoltage trip devices may beusedascircuit interlocks. If anundervoltagecondition exists,operation of the closingmechanism of the circuit breaker will notpermit themain contacts to touch, evenmomentarily.dropout :35-70%of rated voltagepickup :85%of rated voltagenote: toprevent thebreaker from trippingin the event of transient voltage drops,anexternal time delay may be added(fixed delay :min. 0.5 sec. -max.1 sec.,voltage:120V AC, not UL listed)

cat no.controlvoltage

60 Hz4.tripY button04

0.5120 55728240 0.3 77729480 0.15 55730600 0.18 55731DC24 0.14 5573248 0.07 55733125 0.02 55734

TDII

auxiliary and alarmswitchesAuxiliary switches consist of SPOT switchesandprovide remote information of thebreaker status.Alarm switch provides aiarm/lockoutinformation. When the breaker is reset, the"a" contact (alarm) is open, and the "b"contact (lockout) is closed.This SPDT switch is operated when thebreaker is tripped by the trip unit, shunt tripor undervoltage trip device or "push-to-trip"button.

controlvoltage

Toff Ton ^otfToniw7b "a 7b “ a

•21 131II

without motor operator voltage (V) 2 auxiliary switchesauxiliary

4 auxiliary + 1 alarm switchauxiliary2 auxiliary switches cat. no. 55755 alarm alarm

4 aux.+ 1alarm switch cat. no. 55754 50/60 Hz 240- 480 5 6 56for motor operator 3 3600 3 34 auxiliary switches © cat. no. 55676 DC 0.5 0.5 0.5125 0.5© not UL listed0.25 0.25 0.25 0.25250

voltage (V) current (A)overcurrent trip switchSuppliedas standard with the trip unit.Operates in the same way as themechanical trip indicator.The"a"contact closes when thebreakeroperates through the trip unit (overcurrent orground fault). It does not operate if trippingis by shunt trip,undervoltage trip device orpush-to-trip button.

controlvoltage 50/60 Hz 240 2

DC 0.1125alarm

MERLIN GERIN12

Compact CM circuit breakeraccessories

motor operatorOFF position locking

wrated voltage (V) catno.motor operator

The motor operator operates remotely thecircuit breaker on orders from pushbuttons,switches or relays.Remote opening isperformedby shunt triporundervoltage tripdevice.It ensuresresetting andclosing in the same time.ON andOFFpositions are dearly indicatedby a flag indication:

white:ONgreen:OFF

Those two indicators are representative ofthe statusof themaincontacts:the OFFpositioncan beindicatedonly when the maincontacts are fully opened.Not ULlisted.

60Hz120 55611240 55613277 55615480 55617DC24 5561848 55620125 55624operating voltage :80-110% of ratedvoltagemax. operation frequency :2per minuteconsumption :

dosing:350VAopening :refer to shunt trip or

undervoltage trip device tablesmax. dosing time :1.5 sec.

controlvoltage

Tri

auxiliary switches cat no.55676

12 14 22 24 32 34 42 44jp1 Ip1o—o—o—o—O—O—Q—Q—Q— Q—O

5 T T 5LT 3 M4T

41 {A1 TP221 3111© caution:control diagram shall be designed tointerlock remote ON and OFF orders.CA-K auto-supply switch/relayM2 locking switchesM3 auxiliary switches (automatic resetting)M4 alarm switchST shunt trip

4. 4

OFF position lockingThebreaker can be lockedin theOFFposition by the means of 1 to and/or3 padlocks (padlocksnot provided) and 1Kirk key lock (KIRK or CASTELL key lock isprovided-Factory mounted),note :

The adaptator accomodatesup to3padlocks.Padlock shackle diameter:1/4 to5/16

keylock isof the captive key type, freewhenlocked.

cat no.55653padlocking devicecat no. 55768prov. for KIRK key lockcat no.35635KIRK key lockcat no.55769prov. for CASTELL key lock®

© includes padlocking device

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13MERLIN GERIN

V ..Compact CM circuit breakerwiring diagrams

auxiliaryswitches

motoroperator (3)

undervoltage or shunttrip device trip

auxiliary andalarm switches

overcurrenttrip switch (T)

1i i1 r 11 111 ?“TTT —1lock I*T 1 l1 1•alarmI out y|~ triP tI OFF* -closed-I buttonII II &I *ION

rclosedopen III

II I »1-I

-openlI1 l

III l II1 lII I I

II I

IIIII

II

C2DA 12 14 22 24 32 34 42112 |14 22 24 32 34 42 44 |92 B494 A444 P1 P1H%) -L - 4 -L or 7 ' T T 7 “

OP2 P2D1 2121 31 41 31 A111 91 41

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1 4

<D not available on molded case switchCD self cut-off switch(D see page 13 for internal wiring diagramsnote :contacts are shown with the breaker in the open and reset position

V

MERLIN GERIN14

Compact CM molded case switch V •-

ranng (A) , max.symt Amps when protectedbym.c.s.mCM 1600HA 1600 at 240V 125,000 CM1600

at 480V 85,000 CM1600at 600V 50,000 CM1600

CM 2000HA 2000 at 240V 125,000 CM2000at 480V 85,000 CM2000at 600V 50,000 CM2000

CM2500HA 2500 at 240V 125,000 CM2500at 480V 85,000 CM2500at 600V 50,000 CM2500

accessories-dimensions-installationMoldedcase switch accessories,dimensions, installation andconnection areidentical to those of the correspondingcircuit breaker (except for overcurrent tripswitch).

constructionCM molded case switch is designedidentically to CM molded case circuit breaker,except that it is not equipped with a trip unit.High instantaneous trip at 35,000 Amps.UL listed under file E103740.

page11accessories

dimensions 16

Caution :molded case switches does notprovide overcurrent protection.Moldedcase switch can beprotectedby aCM circuit breaker.

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15MERLIN GERIN

CM 1250 - CM 1600Compact CM circuit breakerdimensionsinch / mm

MERLIN GERIN16

Compact CM circuit breakerdimensions

CM 2000

inch / mm

5.43 1.75138 44.5<§> —*-rT +f5.70 H“ *4—145

3.2683+ -trTRIPPED

ON6.69170 20.86

13.77 831 „ 5.90750

9.44 14° i240 i 5° 350

24° -4'! - JLI: 29°2.16 3.2655 835.70 q f +-OFF̂145

\ + + + 4-+ + RESET

10.39 1.75\264 44.5.55

10.7414 .47 dia27315.352.00* I 2.00* 012I

11.0651 390 „•865116.45 2811 22I418 1.7513.26 .25

44.5337 6.517.75 2.87451 733.5 4.724.72 _, 3.5

12089 120 89note:CM 2000 type HHare suitable for continuousoperation at 100 percent of frame rating if used aminimum cubicle space ofH43 x W30 x D20 inches (1100 x 800 x 500 mm) with aminimum ventilationof 90 square inches (6 dm2) both at top and bottom.

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Et3 Efi EQ

.62 .62.62{*): approximate control wire-bending space16 ^ 7616

Drilling for attachmenton rail (only)

Door cutout® trip unit behind door

_ . . _ 2.95 min(§) trip unit through door

- I 2.95 min2.95 min 2.95 min75 7575.38 dia holefor 5/16 bolts

0 .203.34 3.3430

4 85.;

1 rA '’ .-.qr -4rR 19.44

JiI240 m i <ai7.67 7.67AI [0~S1195i I Mit ==* i*M

EtT m,, <1.2055 <^ 3015.352.16 390 14551.2512.9532329

' •• • *.approximate shipping weights :1l8lbs - 54kg

17MERLIN GERIN

CM 2500Compact CM circuit breakerdimensionsinch / mm

11.14 1.75283 44,5id>t + + +

4=i —|o o o o o o+ +root16.18

© n156i !I1 I i

3.2682.75

tfTRIPPEDON

6.69170 21.73

13.77 5525.90I 14° I

9.44150f 5°

240350l

k-ile <D1le CD|

24°I -imu3.262.16 29°

82.7555 V6.18 nJ o o o j T o o oI ^TT OFF L Ji156

i RESET.55+ + + ++ 14

Ll.75I

10.3915.352.00* *51 ! \ t 44.52.00* 26439010.7451 .47 dia16.45I273j

012418 11.06281

4.66 _ '118.5 *13.26 1.751.273371.276.95 6.95

44.517.75 7.2832.3 32.3176.7 176.7

451 185J Snote:CM2500 andCM3000 type HHare suitable for continuousoperation at100 percent of frame rating if used a minimum cubide space ofH43 x W30 x D20 inches (1100 x 800 x 500mm) withaminimum ventilationof 90 square inches (6 dm2) both at top and bottom.u- ^

.25 .25.25 (*): approximate control wire-bending space6.4 6.46.41.77 2.27 1.7745 57.6 45 *

Door cutout@ trip unit behind door

Drilling for attachmenton rail (only) (§) trip unit through door

2.95 min^2.95 min75 75.38 dia hole

for 5/16 bolts <1.203.343.34<30

85r I

*t > 19.44240

7.67195b / 195i tb

<1.2014 <30

i .5515.352.16 39055

V %•

approximate shipping weights : 195lbs - 89kg

MERLIN GERIN18

Compact CM circuit breakerdimensions

motor operatorneutral sensor

inch / mm

motor operator

DInnnl loool

vSi®Mlm

mtWsIc

>?

-ims7 «3

'/A77.7-;7:-<;:7r /- 77 12.203§|:*7'

370 am*El 77v:

/P /'

' - ridS-i-"STiskH^0El F Do o o o o oo o o I 1.41

j 368.66 .86220

10.392214.17 2641360 .60 13.15

33415

neutral sensor

1 .47 dia25 012.59 11.68 .78 .5915 25'2042.8 \ l I 15

.7820 —\ T o o Ct 3.93 5.903.932.36 100 15010060 ii 1 O °BBSF

3.142.47 1.6 .59*+~62.8'+ 8042.2 154.72120

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19MERLIN GERIN

Compact CM circuit breakerappendix

UL 489 test procedures(abstract from UL 489,9th Edition)

standard testsFor solid state trip breaker,anduncompensated thermalbreaker rated40°C, the test sequences are:

test sequenceX Y Z200%calibrationat 25°C (77°F)

135% calibration at 25°C(77°F)calibration of adjust instant tripoverload

100% calibration at 40°C (104°F) ©temperature and100% calibration at 25°C(77°F)endurance200% calibration at 25°C (77°F) repeated135% calibration at 25°C(77°F) repeatedinterrupting ability (Y sequence)interrupting ability (Z sequence)200% trip out at 25°C (77°F)dielectric voltage withstand

© Applies only for thermal breakers rated 40°C.

EnduranceThe breaker must complete an endurancetest:

operations at ratedcurrent and ratedvoltage

followed by no load operation .The power factor shall be 0.75 to 0.80lagging.Examples:

TemperatureWhen connectedwith specifiedcables orbus bars(see below) andwith its ratedcurrent, the temperature rises on thebreakerandat its terminals does not exceedspecified limits.Examples of specified wires and bus

"75°0" copper wire

standard specifications200% calibration at 25°CThebreaker must trip within timelimits whichdepend on the rating from 3 minutes for a30A ratedbreaker, up to 30 minutes over2000A.

135% calibration at 25°CThe breaker must trip within two hours(for breakers ratedmore than50 A).Calibration of adjustableinstantaneous tripThe breaker must trip within the range of 80-130% of the maximum marked trippingcurrent and 75-125% of the minimum markedtripping current.Overload

up to 1600A : fifty operations at600% ofrated current

2000 and 2500A :twenty-five operationsat 600% of ratedcurrent

3000 to 6000A : three operations at 600%followed by twenty-five operations at 200%of rated current.Thepower factor shall be from 0.45 to 0.50lagging.

sizerating numberframe number of cycles of

operations1AWG (60°C)100A 13 AWG sizeor 1

with without total250A 250 MCM1current3/0 AWG v current400A 2

350MCM 100A 6,000 4,000225A 4,000 4,000

600A 2 10,000300 MCM800A 8,0003400MCM1000A 3

600A 1,000 5,000350 MCM 6,0001200A 4800A 500 3,000 3,500copper bus bar 1200A 500 2,000 2,5001600A 500 2,000 2,500sizenumberrating2000A 500 2,000 2,5001/4 x 31600A 22500A 500 2,000 2,5001/4 x 42000A 2

1/4 x 52500A 21/4 x 2.5or 4

(1200A or less :1000A / in^)

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MERLIN GERIN20

Compact CM circuit breakerappendix

UL 489 test proceduresV -

DielectricAfter tests, the breaker must withstandfor oneminute a voltage of 10CX)V plus twicethe rated voltage between:

line andloadterminalsterminals of opposite polaritylive parts and the overall enclosure

Optional tests :high available fault current

Breakers havingpassedall the standardtests may have the UL label applied athigher values than the standard.Test sequence is as follow:

200%calibrationinterrupting capacity :an opening

operation followedby a dose openoperation (O-t-CO) on all poles are performedon the circuit breaker.The power factor over 20000A shall be 0.15to 0.2 lagging.

trip out at 250%dielectric at twice the rated test voltage.100% rated

Breakers having passedall the standardtestsmayhave the ULlabelappliedto usethe drcuit breaker inan enclosure,whencarrying 100% of its maximum rating.Thedrcuit breaker is submitted to additionaltemperature tests performedas inStandardtests, except that the breaker is installed inanendosure.The dimensionsandpossibleventilations shallbe recordedand shall bemarkedon the breaker.

Interrupting ability (Y sequence)Afterendurance tests andcalibrationsrepeated, thebreaker completes an openingfollowedby adose-open operation(O-t-CO),with spedfied current.Examples for three pole breakers:

tests on accessoriesShunt trip and undervoltage tripThese devices are submitted totemperature,overvoltage,operation,endurance and dielectric tests.

Overvoltage testIt checks that the deviceis capable ofwithstanding 110%of its ratedvoltagecontinuously without injury (this test doesnot apply toa shunt trip with an "a"contactconnectedin series).

OperationThe shunt tripmustoperate at 75%of itsrated voltage (except that shunt trip devicesfor use with ground faultprotection shalloperate at 55%).The undervoltage trip must trip thebreaker when the voltage is between 35 and70%of its ratedvoltage and shall seal (i.e.:the breaker cannot be turned on ONposition) when the voltage is at85% or moreof its rated voltage.

EnduranceThe device must becapable of performingsuccessfully for 10% of the number of "withcurrent"operations of the breaker.Auxiliary and alarm switchesAuxiliary andalarm switches mustbesubmitted to temperature, overload,endurance and dielectric tests.

Overload testThe test consists of fifty operations makingand breaking 150% of rated current at ratedvoltage, with a 75-80% power factor in ACandnon inuductive loadin DC.

EnduranceThe switch must make and break its ratedcurrent at rated voltage,with a75-80% power factor in AC,andnoninductive load in AC for 100% of the numberof operations "withcurrent" for auxiliaryswitches,and10% of this number for alarmswitches.

RMS Sym.Amps(3-pole O-t-CO)

frame rating

3,000100ACD3,000225A5,000400A6,000600A10,000800A

1200A 14,0001600A 20,0002000A 25,000

35,0002500A© Above 250V.

Interrupting ability (Z sequence)A3-pole breaker rated 240,480 or 600Vhave to complete an openingoperation andaclose-open operation (O-t-CO) on eachpole, at rated voltage, followedby anopening operation (O) usingall the threepoles for the frame sizes up to 1200A, anadditional close-open operation on the threepoles is required).Examples for 3-poie breaker :frame rating RM Sym.Amps

each common ^poleO-t-CO o { O-t-CO

1CX) to 800A 8,660 10,0001000 to 1200A 12,120 14,0001600A 14,000 20,0002000A 14,000 25,0002500A 25,000 35,000

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MERLIN GERIN 21

routine and maintenanceguidelines

Compact CM circuit breakerappendix

insulation resistancetestsWhen breakers are subjected to severeoperating conditions, insulation resistancetest should be performed as indicated inNEMA standard publication no AB2-1980.Aninsulation resistance test is used todetermine the quality of the insulationbetween phases andphase to ground. Theresistance test is made with a DC voltagehigher than the rated voltage, to determinethe actual resistance of the insulation. Themost common method employsa “megger"type instrument A1000V 'instrument willprovide a more reliable test because it iscapable of detecting tracking on insulatedsurfaces. Resistance values below 1megohm are unsafe and should beinvestigated. An insulation test should bemade :

between line andload terminals ofindividual poles with the circuit breakercontacts open.

between adjacent poles and from poles tothe metallic supporting structure with thecircuit breaker contacts closed. The lattertest may be done with the circuit breaker inplace after the line and load conductorshave been removed, or with the circuitbreaker bolted to ametallicbase whichsimulates the in-service mounting.

recommendedinspection intervalsMerlin Gerin circuitbreakers aredesigned to be maintenance-free.However, all equipment withmovingparts requires periodic inspection toensure optimum performance andreliability. We recommend that thecircuit breakers be routinely inspectedsix months after installation, followed byannual inspection. Intervalscan varydepending on your particular experience.

A DANGERHAZARD OF ELECTRIC SHOCK,BURNOR EXPLOSION.

•This equipment must be installed andserviced only by qualified electricalpersonnel.

•Turn off all power supplying this equipmentbefore working on or inside equipment.

•Always use a properly rated voltagesensing device to confirm power is off.

•Replace all devices,doors,and coversbefore turning on power to this equipment.

Failure to follow these instructions willresult in death or serious injury.

inspection of terminalsConnections to circuit breaker

terminals could be inspected. If there isdiscoloration due to overheating, thejoint should be dissassembledand thesurface cleanedbefore reinstallation.It is essential that electrical connections bemade carefully in order to preventoverheating.

Check for terminal tightness.

cleaningRemove the dust and dirt that haveaccumulated on the circuit breakersurface and terminals.

mechanical checksEven over long periods circuit breakersare not often required to operate onoverload or short-circuit conditions.Therefore it is essential to operate thebreaker periodically.To trip the breaker, push the push-to-trip button.

electrical testsThese tests require equipment forconducting pole resistance, overcurrentand instantaneous tripping, in accordancewith NEMA standard publication AB4.They are not within the scope of normal fieldoperation.

MERLIN GERIN22

Compact CM circuit breakerappendix

international standardsV * *

molded case circuit breakerIn addition to UL 489 standard,CMbreakerscomply with IEC 947-2 standard as per tablebelow:

circuit breakers forcompliance with otherworld standardsWhere compliancewith 1EC standards isrequired,Merlin Gerin offers a versatilerange(not ULlisted) of CMcircuit breakerstomeet your specific needs. Units includethree or four poles,voltagesup to 660Vratings from 1250A to 3200A, interruptingcapabilities of 85,000A at 415V, and50.000A at660V.Anextensive rangeofaccessories complements the product line.For further information,please contact yourMerlin Gerin representative.

Interrupting ratingsU/L 489 listed

CM type3-pole

ampererating (A) IEC 947-2

RMS Sym.Amps240V 480V 600V 380/415V 660V

*:r.- • ' :? >standard rated breaker ,;V

CM1250HE 1250 125,000 85,000 50,000 85,000 50,000CM1600HE 1600 125,000 85,000 50,000 85,000 50,000CM 2000HE 2000 125,000 85,000 50,000 85,000 50,000CM 2500HE 2500 125,000 85,000 50,000 85,000 50,000

prawns- -V

- •' V v '

:-. v - - \100% rated breaker ^CM 1250HH 1250 125,000 85,000 50,000 85,000 50,000CM 1600HH 1600 125,000 85,000 50,000 85,000 50,000CM 2000HH 2000 125,000 85,000 50,000 85,000 50,000CM 2500HH 2500 125,000 85,000 , 50,000 85,000 50,000

shunt trip undervoltage trip devicerated voltage (V) rated voltage (V)UL489 listed IEC 947-2 UL 489 listed IEC 947-260Hz 120 50/60Hz 110-127 DC DC24 24

240 220-240 48 48480 380-415 125 125

DC 24 DC 24 auxiliary switches,alarm switch,overcurrent trip switchIEC 947-2 characteristics are the same asthose indicated in page 12.

48 48125 125

•->/ *' * V ' * v

23MERLIN GERIN

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