MERLIN GERIN MCB

Molded case circuit breaker

Compact TM NSECatalog

We do more with electricity

1CompactTM NS circuit breaker


Compact TM NSEFunctions and characteristics

page

Functions and characteristics

The CompactTM circuit breaker line 2

General characteristics 3

Circuit breaker 6

Switch 7

Motor circuit protector 8

Installation and connections 9

Accessories 10

Dimensions, connections and wiring diagrams 17

Supplementary technical information 23

2 CompactTM NS circuit breaker

CompactTM NS circuit breaker: functions and characteristics

The Compact TM circuit breaker line

Circuit breakers page 6

pushto

trip

Switches page 7

Rated 100 150–250 400–600 800–1200 1600–2500current (A)

(1) (1) (1) (1)

Compact TM NSE100A NSF150A NSJ400A CK800NA CM1600HANSF250A NSJ600A CM2000HA

CK1200NA CM2500HA

Rated 15–100 15–250 60–600 160–1200 500–2500current (A)

(1) (1) (1) (1)

Compact TM NSE100 NSF150 NSJ400 CK400.. CM1250..NSF250 NSJ600 CK1200 CM2500

Interrupting N 18 35 35 50 -rating H - 65 65 65 85at 480 V L - - 100 150 -

pushto

trip

(1) NSF, NSJ, CK and CM circuit breakers: see appropriate catalog.

E28

473

E28

473

0545

6105

4559

Motor circuit protectors page 8

Rated 75 150–250 400–600 800–1200current (A)

(1) (1) (1)

Compact™ NSE75HC NSF150HC NSJ400HC CK800N/HNSF250HC NSJ600HC CK1000HL/L

CK1200N/H

E36

161

0545

65

pushto

trip

This catalog is dedicated to UL489 Compact NS range. For UL 508 and IEC 947-2 Compact NS ranges, refer to appropriate catalog.



General characteristicsCompliance with standards

E28

472 Compliance with North American standards

CompactTM NS circuit breakers are built in accordance with UnderwritersLaboratories Inc. UL 489 Standard and Canadian Standards Association CSA C22.2No.5.1 Standard. Circuit breakers, switches and their accessories, except wherenoted, are Listed under UL files E63335, E103740, E103955, and Certified underCSA files LR69561 and LR88980.

Compliance with international standardsCompactTM NS circuit breakers and their accessories comply also with the followinginternational standards:c IEC 947-1: general rules;c IEC 947-2: circuit breakers;c IEC 947-3: switches, disconnectors, switch disconnectors, etc.In that these standards are applied in most countries, CompactTM circuit breakers andtheir accessories comply with European (EN 60947-1 and EN 60947-2) and thecorresponding national standards:c France NF;c Germany VDE;c U.K. BS;c Australia AS;c Italy CEI.

Compliance with the specifications of marineclassification organizations

CompactTM NS circuit breakers have been approved for marine application by theAmerican Bureau of Shipping, Bureau Veritas, Lloyd’s Register of Shipping, RegistroItaliano Navale, Germanischer Lloyd’s and Det Norske Veritas.They comply with the following standards:c UL 489 Supplement SA. Marine use on vessels over 65 feet in length;c US Coast Guard specifications;c IEC 92-504 and marine specifications: inclination, vibrations, insulation resistance;c IEC 803 Electromagnetic Disturbance Immunity.

Tropicalization

CompactTM NS circuit breakers comply with NF C 63-100 standard level 2 conditions(95 % relative humidity at 45 °C or 80 % at 55 °C, hot and humid climate conditions).They also comply with the following standards:c IEC 68-2-30 damp heat;c IEC 68-2-2 dry heat;c IEC 68-2-11 salt spray;c IEC 68-2-1 low temperatures.

Pollution degreeCompactTM NS circuit breakers are certified for operation in pollution degree IIIenvironments as defined by IEC standard 947 (industrial environments).

Environmental protection

CompactTM NS circuit breakers take into account concerns for environmentalprotection. Most components are recyclable and parts are marked as specified inapplicable standards.

compact

IEC947.2

240V ac480V ac

65kA18kA

Icu

UTE VDE BS CEI UNE NEMA

MERLIN GERIN

NSE 100 N50/60Hz

UL/CSAinterrupting ratingsRMS sym. Amps

220/240V380/415V

50kA30kA

Cat A

Ics = 50% IcuUi 750V Uimp 8kV

480V40°C


Suitability for isolation positive contact indication

0557

79

All CompactTM NS circuit breakers and switches are suitable for isolation as definedin IEC 947-2 Standard:c The isolation position corresponds to the O (OFF position);c The operating handle cannot indicate the OFF position unless the contacts areopen;c Padlocks may not be installed unless the contacts are open.Installation of a rotary handle or a motor mechanism does not alter the functionalityof the position indication system.The isolation function is certified by tests guaranteeing:c The mechanical reliability of the position indication system;c The absence of leakage currents;c Overvoltage withstand capacity between upstream and downstream connections.

E18

569

Installation in Class II switchboards

All CompactTM NS circuit breakers, even when fitted with a rotary handle or a motormechanism, can be installed through the door of Class II IEC switchboards (as perIEC 664 Standard).Installation requires no special insulation because the CompactTM NS circuit breakersprovides Class II insulation between the front face and all internal circuits.

Circuit breaker marking

E36

863

Switch marking


General characteristics


The limiting capacity of a circuit breaker is its ability tolimit short-circuit currents.

Exceptional current limiting capacity

Circuit breaker current limiting capacity

The exceptional limiting capacity of the CompactTM NS line is due to the double breaktechnique (very rapid natural repulsion of contacts and the appearance of two arcvoltages in series with a very steep wavefront).

The exceptional limiting capacity of the CompactTM NS line greatly reduces the forcescreated by fault currents in devices. The result is a major increase in breakingperformance. In particular, the service breaking capacity Ics is equal to 100 % of Icu.The Ics value, defined by IEC 947-2, is guaranteed by tests comprising the followingoperations:c Breaking a fault current equal to 50 % of Icu three times consecutively;c Checking that the device continues to function normally:v Conduction of rated current without abnormal temperature rise.v Protection functions perform within the limits specified by the standard.v Suitability for isolation is not impaired.

prospectiveIsc

Isc

t

limitedIsc peak

limitedIsc

tsc

prospectiveIsc peak

actualcurrent

prospectivecurrent

Longer service life of electrical installationsCurrent limiting circuit breakers greatly reduce the negative effects of short circuitson installations.

Thermal effectsLess temperature rise in conductors, therefore longer service life for cables.

Mechanical effectsReduced electrodynamic forces, therefore less risk of electrical contacts or busbarsbeing distorted or broken.

Electromagnetic effectsLess disturbance for measuring devices located near electrical circuits.

E28

801


Circuit breaker

pushto

trip

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473

CompactTM NSE100N circuit breaker

0545

61

UL 489 Listed ratingsCompact TM circuit breakers NSE100NNumber of poles 3Rated voltage (V) AC 50/60 Hz 480Rated current (A) 40 °C 15-100

Interrupting ratings (kA rms) 240 V 65480 V 18

IEC 947-2 and EN 60947-2 ratingsCompact TM

circuit breakers NSE100N

Number of poles 3Rated insulation voltage (V) Ui 750Rated impulse withstand Uimp 8voltage (kV)Rated operational voltage (V) Ue AC 50/60 Hz 480

DC 250Rated current (A) 40 °C 15-100

Ultimate breaking capacity Icu AC 50/60 Hz 220/240 V 50(kA rms) 380/415 V 30

440 V 15500 V –525 V –660/690 V –

DC 125 V 10(1 pole)250 V 10(2 polesin series)

Service breaking capacity Ics (% Icu) 50Utilization category A

Protection characteristicsProtection against overloads and short circuits with a built-in thermal-magnetic tripunit (fixed thresholds).

Ratings (A) 40 °C 15 20 30 40 50 60 70 80 100

Overload protectionThermal non adjustable

Short-circuit protectionMagnetic non adjustableHold 600 600 600 600 800 800 800 800 800Trip 1200 1200 1200 1200 1400 1400 1400 1400 1400Circuit breaker is Listed under UL file E63395 and Certified under CSA file LR 69561.


Ratings and interrupting ratings


Switch


CompactTM NSE100A circuit breaker

UL 1087 Listed ratingsCompact TM switches NSE100ANumber of poles 3Rated voltage (V) AC 50/60 Hz 480Rated current (A) 100

IEC 947-3 ratingsCompact TM switches NSE100ANumber of poles 3Rated insulation voltage (V) Ui 750Rated impulse withstand voltage (kV) Uimp 8Rated operational voltage (V) Ue AC 50/60 Hz 480

DC 250Rated operational current (A) Ie AC23A 690 V 100

DC23A 250 V 100DC23A 500 V 100(2 poles in series)

Making capacity (kA peak) 2Short-time withstand current (kA rms) Icw Icw (kA rms) 1.5

duration (s) 3

Short-circuit withstand currentMolded case switches are identical to molded case circuit breakers, except that theyare not equipped with trip units. When protected by any protective device, they aresuitable for use on a circuit capable of delivering not more than (rms, symmetricalcurrent):c 240 V: 100 kA;c 480 V: 65 kA;c 600Y/347 V: 18 kA;Switch is Listed under UL file E103740 and Certified under CSA file LR 88980.

E28

473

pushto

trip

0545

59



Motor circuit protector

0545

65

CompactTM NSE75HC circuit breaker

UL 489 Listed interrupting ratingsCompact TM circuit breakers NSE75HCNumber of poles 3Rated voltage (V) 600Y/347Rated current (A) In 40 °C 3, 7, 15, 30, 50, 75Magnetic trip setting Im adjustable 3...11 In

Interrupting ratings In combination with Telemecanique LCIcontactors and LR2 overload relays

IEC 947-2 and EN 60947-2 interrupting ratingsCompact TM circuit breakers NSE75HCNumber of poles 3Rated insulation voltage (V) Ui 750Rated impulse withstand Uimp 8voltage (kV)Rated operational voltage (V) Ue AC 50/60 Hz 690

Ultimate breaking capacity Icu 200/240 V 100AC 50/60 Hz (kA rms) 380/415 V 70

440 V 65690 V 6

Service breaking capacity Ics (% Icu) 50Utilization category AMotor circuit protector is Recognized under UL file E113389 and Certified under CSA file LR69561.

When associated with the intended overload relays,these breakers are suitable for use on a circuit capableof delivering not more than (rms, symmetrical current):c 480 V: 65 kA;c 600Y/347: 25 kA.


Installation and connections


Fixed mounting

Cable connectionsThe CompactTM NSE circuit breaker is equipped as standard with connectors for barecables and is suitable for reverse feeding.Terminal covers can be fitted (see page 15).

NSEL Inch 0.75

mm 19S AWG # 14 AWG–# 1/0 AWG Cu

# 8 AWG–# 1/0 AWG Almm2 1.5–70 mm2

O F F

pushto

trip

E29

145

E28

478

S

L

O F F

pushto

trip

E 2

8475

Mounting on rails

O F F

pushto

trip

O F F

pushto

trip

Mounting on DIN railMounting on backplate

E28

476

E28

477



Accessories

E29

172

Internal accessories comply with requirements of Underwriters Laboratories Inc.UL 489 and Canadian Standards Association C22.2 No. 5.1 Standards. All internalaccessories are listed for field installation per UL file 103955 and Certified underCSA file LR 69561.

IA

E

B

C

DF

G

H

SHTMX

UVRMN

AXOF

ALSD

O F F

auxiliary switch (OF)

shunt trip (MX) or undervoltagetrip (MN)

alarm switch (SD)

ConnectionsEach electrical accessory is fitted with numbered terminal blocks for wires with thefollowing maximum size:c #18 AWG (0.75 mm2) to #14 AWG (2.5 mm2) for auxiliary switches, shunt trip orundervoltage release.

Auxiliary circuits exit the device through a knock-out in the front cover.

E28

479

Location


Auxiliary and alarm switches

0545

49

For CompactTM NSE100N circuit breaker

Changeover switches

Auxiliary switches provide remote information of the circuit breaker status and canthus be used for indications, electrical locking, relays, etc.

Functionsc OF (open/closed): indicates the position of the circuit breaker contacts;c SD (trip indication): indicates that the circuit breaker has tripped due to:v An overload,v A short circuit,v The operation of shunt trip or undervoltage trip or the "push-to-trip" button whichresets when the circuit breaker is reset.c CAM (early-make or early-break function): indicates the position of the rotaryhandle. Used in particular for advanced-opening safety trip devices;c Switching of very low loads: all above auxiliary switches are also available in low-level versions capable of switching very low loads (e.g., for the control of PLCs orelectronic circuits).

Standards

Auxiliary switches comply with UL 489, CSA C22.2 No.5.1 and IEC 947-5 Standards.

Installationc Functions OF and SD:v The switches snap into cavities under the front accessory cover of the circuitbreaker,v One model serves for all indication functions depending on where it is fitted in thecircuit breaker;c CAM: to be fitted in the rotary handle module.

Electrical ratings

UL 489 and CSA C22.2 No.5.1 ratingsLow-level switches Regular switches

Minimum rating 1 mA—4 V 10 mA—24 VMaximum 50/60 Hz 240 V 5 6rating 480 V 5 6

600 V 3DC 48 V 2.5 2.5

125 V 0.8 0.8250 V 0.3 0.3

IEC 947 ratingsLow-level switches Regular switches

Rated thermal current (A) 5 6Minimum rating 1 mA—4 V 10 mA—24 V

AC DC AC DCUtilization category AC12 AC15 DC12 DC14 AC12 AC15 DC12 DC14(IEC 947-4)Operational 24 V 5 3 5 1 6 6 2.5 1current (A) 48 V 5 3 2.5 0.2 6 6 2.5 0.2

110 V 5 2.5 0.8 0.05 6 5 0.8 0.05220/240 V 5 2 6 4250 V 0.3 0.03 0.3 0.03380/415 V 5 1.5 6 3440 V 5 1.5 6 3660/690 V 6 0.1



Accessories

Electrical characteristicsAC DC

Rated voltage (V) 42, 48, 110/130, 208, 220/240 24, 48, 125277, 380/415, 440/480 250

Consumption pick-up (MX) < 10 VA < 5 Wseal-in (MN) < 5 VA < 5 W

Clearing time (ms) < 50 < 50

Shunt trip and undervoltage tripA voltage release can be used to trip the circuit breaker via a control signal.

Undervoltage trip (MN)c Trips the circuit breaker when the control voltage drops below a tripping threshold;c Drops out between 35 % and 70 % of the rated voltage;c Circuit breaker closing is possible only if the voltage exceeds 85 % the ratedvoltage;c Permanent type;c When an overvoltage condition exists, operation of the closing mechanism of thecircuit breaker will not permit the main contacts to touch, even momentarily;c Control voltage: 220/240 V AC.

Shunt trip (MX)Trips the circuit breaker when the control voltage rises above 70 % of its ratedvoltage.Impulse type u 20 ms or maintained control signals.AC shunt trips can be operated at 55 % of their rated voltage, making them suitablefor ground-fault protection when combined with a Class I ground-fault sensingelement.

Operationc The circuit breaker must be reset locally after being tripped by a shunt trip orundervoltage trip (MN or MX);c MN or MX tripping has priority over manual closing. In the presence of a standingtrip order, such on action does not result in any closing, even temporarily, of themain contacts;c Endurance:v 50 % of the rated mechanical endurance of the circuit breaker.

Installation and connectionc Accessories are located within the circuit breaker behind the front accessory cover;c Each terminal can be connected by one stranded copper wire # 18—# 14 AWG(1.5 mm2).

For CompactTM NSE circuit breaker

0545

50


Direct rotary handle

Operationc The direct rotary handle maintains:v Suitability for isolation,v Indication of three positions O (off), I (on) and tripped,v Access to the push-to-trip button,c The circuit breaker may be locked in the off position by one to three padlocks,padlock shackle diameter 0.19 to 0.31 inch (5 to 8 mm) (padlocks are not supplied).

InstallationReplaces the circuit breaker front accessory cover. Secured by screws.

Modelsc Standard with black handle;c VDE type with red handle and yellow bezel for machine tool control.

VariationsAccessories transform the standard direct rotary handle for the following situations:c Motor control centers (MCC):v Door opening prevented when circuit breaker is on,v Circuit breaker closing inhibited when door is open.Listed under UL file E103955 and Certified under CSA file LR 69561.

Door mountedMakes it possible to operate circuit breakers installed inside an enclosure from thefront.The handle mechanism can be used in NEMA 3R and 12 enclosure applications.Degree of protection: IP40 as per IEC 529.

Operationc The unit maintains:v Suitability for isolation,v Indication of the three positions O (off), I (on) and tripped,v Visibility of and access to trip unit settings when the door is open,c Door opening prevented when circuit breaker is on;c The circuit breaker may be locked in the off position by one to three padlocks:padlock shackle diameter 0.19 to 0.31 inch (5 to 8 mm) (padlocks are not supplied).Locking prevents opening of the switchboard door.

Modelsc Standard with black handle;c VDE with red handle and yellow bezel for machine tool control.

InstallationThe extended rotary operating handle is made up of:c A unit that replaces the front accessory cover of the circuit breaker (secured byscrews);c An assembly (handle and front plate) on the door that is always secured in thesame position, whether the circuit breaker is installed vertically or horizontally;c An extension shaft that must be adjusted. The distances between back of circuitbreaker and door are 3.24 to 3.34 inch (82.5 to 85 mm).Listed under UL file E103955 and Certified under CSA file LR 69561.

Rotary operating handles

CompactTM NSE100N circuit breakerwith direct rotary handle

0545

5805

4563

CompactTM NSE100N circuit breaker with extended rotaryhandle



AccessoriesCable operating handle

Operationc The cable operator maintains:v Suitability for isolation,v Indication of three positions O (off) I (On) and tripped,v Acces to push-to test,v The circuit breaker may be locked in the off position by one to their padlocks,v Door can be locked closed due to interlocking features of the handle operator.

InstallationHandle is mounted on flange of enclosure using specified mounting dimensionswhile circuit breaker and operating mechanism are mounted to inside of enclosureusing two screws models.Cable lengths available in 3, 5 or 10 ft lengths to accomodate variety of mountinglocations Handles available in painted Nema 1, 3, 3R, 4 (sheet steel) and 12 ratingsor chrome (Nema 4, 4x).

Flange-mounted handle cable operating mechanism

E36

852

O F F

pushto

trip


Locking and interlocking systems

c Padlocking systems can receive up to three padlocks with diameters ranging from 0.19 to 0.31 inch (5 to 8 mm) (padlocks are not supplied).

O F F

pushto

trip

pushto

trip

OOFF

ONI

Locking of the toggle using aremovable device

Locking of the rotary handle usinga padlock

Terminal covers

Terminal covers provide protection against contact with live parts.Internal interphase barriers provide additional electrical clearances between poles.Terminal covers are sealable.

Sealing accessories

This accessory includes the elements required to fit lead seals to prevent:c Front accessory cover removal;c Rotary handle removal;c Access to accessories;c Terminal shield removal;c Access to power connections.

E28

480

E28

481

E36

864

E23

905

Locking systems

E23

908

E23

906



Compact TM NSEDimensions, connections and wiring diagrams

page

Dimensions

Compact™ NSE circuit breaker 18

Rotary handle 19

Connections 21

Wiring diagrams 22


CompactTM NS circuit breaker: dimensions and wiring diagrams

DimensionsCompact ™ NSE100

3.93100

X

Z

2.5364.5

2.7570 3.14

803.3084

2.3660

4.72120

4.05103

8.11206

E28

842

X

Y

3.5490

1.7745

(a)

E28

482

Mounting on backplate or on rails

X

Y

1.1830 0.59

15

1.948.5

3.93100

Ø 0.15Ø 4

X

Y

1.1830 0.59

15

1.948.5

3.93100

≤ 1.25≤ 32

Ø 0.15Ø 4

Mounting on DIN rail

E28

483

4.03102.5

X

2.8572.5 3.24

82.53.486.5

2.5364.5

4.72120

3.8798.5

8.11206

Z

0.5915

3.5490

X

Y

3.5490

1.7745

(a)

E28

497

X

Z

A

B/C

2.79713.18

81

1.1830

Y

2.6968.5X

Cutout A Cutout B Cutout C

E28

847 0.57

14.5

1.0226

X

Y

2.3860.5

1.1429

E28

848

E28

849 1.81

46

1.1830

X

Y

2.6968.5

3.6292

E28

850

Front panel cutouts

(a) terminal shields.

E28

843

E28

844

inchmm

0.410

13.835

0.410

13.835

Electrical clearancesE

3686

5


Direct rotary handle

Mounting on backplate or on rails

1.1228.5

Z

3.2482.5 4.4

112

X2.5765.5

E28

841


X

Z

3.3485 4.5

114.5

1.1228.5

2.5765.5

E28

488

E28

489

Front panel cutout

X

Z

3.3485

E28

851

1.6943

1.1830

X

Y

2.6968.5

3.3886

E28

852

Cut shaft at length L - 4.29/109

Y

X

2.95751.47

37.50.297.5

2.9575

1.4737.5

0.164.2

60°

60°

Z

X

L (6.88/175 min.) 23.22/590 max.

E28

854

E28

853

E28

855

Y

X

0.297.5

45°

Ø 0.16Ø 4.2

Ø 1.96Ø 50

0.164.2

1.4136

2.8372

Extended rotary handleFront panel cutoutDimensions

OOFF

ONI

tripped

60°

60° X

Y

3.5490

1.77453.14

80

0.297.5

0.164.2

1.8747.5


4.75121 1.06

27

0.318

11.32287

11.32287

7.01178

8.75222

5.19132

4.31109

9.38238

10.38264

MCC type rotary handleDimensions

4.56± .07(*)116 ± 2

0.03 to 0.11 max.1 to 3 max.

(*) Mounting on DIN rail: 4.66/118.5 ± 2

E28

490 Y

X

0.297.5

0.471202.72

69.2

0.164.2

2.3660

4.72120

E28

856

Front panel cutout

E28

857

Y

X

3.93100

2.0351.7

1.845.8

3.93100

∆

h

E22

046

Note:Door cutouts require a minimum distance between thecenter of the circuit breaker and the door hingepoint ∆ u 100 + (h x 5).


Dimensions inchmm

Cable operating handleDimensions

E36

867

E36

868


O F F

pushto

trip

E28

484

Front connections

E28

846

1.5 to 70 mm2

#14 — 1/0 Cu or #8 — 1/0 Al

0.7519

X

Z

1.2532

X

Y

1.9048.5

3.8197

1.1429.2

1.1429.2

E28

845

E28

485


X

Y

3.5490

1.7745

2.0853

1.7344

1.1429.2

1.1429.2

X

Z

1.3534.5

3.2683

1.3534.5E

2848

6

E28

487


Connections



Wiring diagramsAuxiliary switches, shunt trip and undervoltage trip

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866

SymbolsMN : undervoltage tripMX : shunt tripSD : alarm switchOF1 : position indication

switchCAO1 : early-break switch(rotary operating handle)

Legend(1) : undervoltage or shunt

trip (MN : D1, D4;MX : C1, C2).

Color codeYE : yellowVT : purpleGY : grey

92 94

SD

91

C1

C2

MN

12 14

OF1

11

D1

D4

MX

(1)

CAO1

YE

VT

GY

trip unit



Compact TM NSESupplementary technical information

page

Trip curves 24

Let-through curves 25

UL 489 test procedures 28

IEC 947-2 test procedures 30

Routine and maintenance guidelines 32


10 0005 000

2 000

1 000

500

200

100

50

20

10

5

2

1

.5

.2

.1

.02

.01.005

.5 1 2 5 10 20 50 100

t(s)

I / Ir

.05

500 1000 10 000

Trip: 1200 A

Hold: 800 A

10 0005 000

2 000

1 000

500

200

100

50

20

10

5

2

1

.5

.2

.1

.02

.01.005

.5 1 2 5 10 20 50 100

t(s)

I / Ir

.05

500 1000 10 000

Trip: 1000 A

Hold: 600 A

CompactTM NS circuit breaker: supplementary technical information

Trip curves

E29

037

E29

038

TM15 to TM40 (15 to 40 A)

TM50 to TM100 (50 to 100 A)

Effect of high temperaturesWhen the ambient temperature is greater than 40 °C, overload protectioncharacteristics are slightly modified. When determining tripping times usingtime/current curves, the Ir values corresponding to the thermal setting on the circuitbreaker must be reduced using the coefficients below:

45 °C 50 °C 55 °C 60 °C 65 °C 70 °C0.975 0.95 0.925 0.90 0.875 0.85

ExampleFor a TM100DP (100 A) circuit breaker, a 200 A fault current and an ambienttemperature of 40 °C. What is the tripping time?c Ir = 100 A;c I/Ir = 200/100 = 2.On the time/current curve, t = 100 sec.Consider the same conditions, except an ambient temperature of 65 °C.What is the tripping time?c Ir = 100 x .875 = 87.5 A;c I/Ir = 200/87.5 = 2.28.On the time/current curve, t = 65 sec.


Let-through curves at 240 V


Maximum peak let-through current (Amperes)

2 3 4 6 10 20 30 40 60 100 200 3002

3

5

2

3

5

2

3

5

2

104

105

106

15-20 A

50-100 A30-40 A

Max

imum

(*)

Let

-Thr

ough

I2 t (

Am

pere

s x

103 )

(*)

Bas

ed o

n va

lues

obt

aine

d th

roug

hout

the

circ

uit b

reak

er d

evel

opm

ent a

nd U

L te

st p

rogr

ams.

Available Short circuit Current (RMS Symmetrical Amperes x 10 3)

2 3 4 6 10 20 30 40 60 100 200 300

Max

imum

(*)

Pea

k Le

t-T

hrou

gh C

urre

nt (

Am

pere

s x

103 )

(*)

Bas

ed o

n va

lues

obt

aine

d th

roug

hout

the

circ

uit b

reak

er d

evel

opm

ent a

nd U

L te

st p

rogr

ams.

.6

.4

1

2

4

10

20

3

.5

.7

.8

5678

15-20 A

50-100 A30-40 A


E29

033

E29

032

Maximum let-through I 2t (Amperes 2 Seconds)


2 3 4 6 10 20 30 40 60 100 200 3002

3

5

2

3

5

2

3

5

2

104

105

106

50-100 A

Max

imum

(*)

Let

-Thr

ough

I2 t (

Am

pere

s x

103 )

(*)

Bas

ed o

n va

lues

obt

aine

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NSE100N75 A50 A30 A15 A

7 A

3 A

NSE75HC

15-20 A30-40 A

2 3 4 6 10 20 30 40 60 100 200 300

.6

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1

2

4

10

20

3

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5678

Max

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Am

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50 A30 A15 A

75 A

7 A

3 A

30-40 A

15-20 A

50-100 ANSE100N

NSE75HC


Let-through curves at 480 V


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039

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035

2 3 4 6 10 20 30 40 60 100 200 300

.6

.4

1

2

4

10

20

3

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.7

.8

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15-20 A

30-40 A50-100 A

Max

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Available Short Circuit current (RMS Symmetrical Amperes x 10 3)

2 3 4 6 10 20 30 40 60 100 200 3002

3

5

2

3

5

2

3

5

2

104

105

106

15-20 A

30-40 A50-100 A

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Let-through curves at 380/415 V



UL 489 test proceduresStandard testsFor electronic trip circuit breakers and uncompensatedthermal-magnetic circuit breaker rated 40 °C, the testsequences are as shown in the table:

Test SequenceX Y Z

200 % calibration at 25 °C (77 °F) c c c135 % calibration at 25 °C (77 °F) cCalibration of adjustable instantaneous trip cOverload cTungsten lamp load ➀

100 % calibration at 40 °C (104 °F) ➁

Temperature and 100 % calibration at 25 °C (77 °F) cEndurance c200 % calibration at 25 °C (77 °F) repeated c135 % calibration at 25 °C (77 °F) repeated cInterrupting ability (Y sequence) cInterrupting ability (Z sequence) c200 % trip out at 25 °C (77 °F) c cDielectric voltage withstand c c c➀ Applies only to circuit breakers rated 50 A or less, and 125 or 125/250 V or less➁ Applies only to thermal-magnetic breakers rated 40 °C.

Standard specifications

TemperatureThe temperature rise at the circuit breaker and at itsterminals does not exceed specified limits whenconnected with specified cables or busbars (seebelow) and at its rated current.

Examples of specified wires and busc 75 °C copper wire

EnduranceThe circuit breaker must complete an endurance test:c operations at rated current and rated voltage;c followed by no load operation.The power factor shall be 0.75 to 0.80 lagging.

ExamplesFrame size Number of cycles of operations

With Without Totalcurrent current

100 A 6,000 4,000 10,000225 A 4,000 4,000 8,000400 A 1,000 5,000 6,000600 A 1,000 5,000 6,000800 A 500 3,000 3,5001200 A 500 2,000 2,5001600 A 500 2,000 2,5002000 A 500 2,000 2,5002500 A 500 2,000 2,5003000 A 400 1,100 1,500

Rating Number Size100 A 1 # 1 AWG (60 °C)

1 # 3 AWG250 A 1 250 kcmil400 A 2 3/0 AWG600 A 2 350 kcmil800 A 3 300 kcmil1000 A 3 400 kcmil1200 A 4 350 kcmil

c Copper busbar

Rating Number Size1600 A 2 1/4 x 32000 A 2 1/4 x 42500 A 2 1/4 x 5

4 1/4 x 2 - 1/23000 A 4 1/4 x4

(1200 A or less: 1000 A / in2)

200 % calibration at 25 °CThe circuit breaker must trip within time limits which depend on the rating from threeminutes for a 30 A rated circuit breaker, up to 30 minutes over 200 A.

135 % calibration at 25 °CThe circuit breaker must trip within two hours (for circuit breakers rated more than 50 A).

Calibration of adjustable instantaneous tripThe circuit breaker must trip within the range of 80-130 % of the maximum markedtripping current and 75-125 % of the minimum marked tripping current.

Overloadc up to 1600 A: 50 operations at 600 % of rated current;c 2000 and 2500 A: 25 operations at 600 % of rated current;c 3000 to 6000 A: three operations at 600 % followed by 25 operations at 200 % ofrated current.The power factor shall be from to 0.45 to 0.50 lagging.

Calibration


Interrupting ability (Y sequence)After endurance tests and calibrations are repeated,the circuit breaker completes an opening (O) followedby a close-open operation (O-t-CO), with specifiedcurrent.Examples for 3-pole breakersFrame rating RMS Sym. Amperes

(3-pole O-and-CO)100 A ➀ 3,000225 A 3,000400 A 5,000600 A 6,000800 A 10,0001200 A 14,0001600 A 20,0002000 A 25,0003000 A 35,000

➀ Above 250 V.

Interrupting ability (Z sequence)A 3-pole circuit breaker rated 240, 480 or 600 V has tocomplete an opening operation (O) and a close-openoperation (O-and-CO) on each pole, at rated voltage,followed by an opening operation (O) using all 3-pole(for frame sizes up to 1200 A, an additional close-openoperation (C-O) on the 3-pole circuit breaker isrequired).

Examples of 3-pole circuit breakersFrame rating RMS Sym. Amperes

Each CommonpoleO-and-CO O

100 to 800 A 8,660 10,0001000 to 1200 A 12,120 14,0001600 A 14,000 20,0002000 A 14,000 25,0003000 A 25,000 35,000

DielectricAfter tests, the circuit breaker must withstand for one minute a voltage of 1000 Vplus twice the rated voltage between:c line and load terminals with circuit breaker is open, tripped and off positions;c terminals of opposite polarity with circuit breaker closed;c live parts and the overall enclosure with circuit breaker open and closed.

Interrupting ability

Optional testsccccc High available fault currentCircuit breakers having passed all the standard tests may have the UL Listing labelapplied at higher values than the standard.Test sequence is as follows:v 200 % calibration,v interrupting capacity: an opening operation followed by a close-open operation(O-and-CO) on all poles are performed on the circuit breaker.The power factor over 20000 A shall be 0.15 to 0.2 lagging:v trip out at 250 %,v dielectric at twice the rated test voltage.

ccccc 100 % ratedCircuit breakers having passed all the standard tests may have the UL Listing labelapplied to use the circuit breaker in an enclosure when carrying 100 % of itsmaximum rating.The circuit breaker is submitted to additional temperature tests performed as instandard tests, except that the circuit breaker is installed in an enclosure.The dimensions and possible ventilations shall be recorded and shall be marked onthe circuit breaker.

Tests on accessoriesShunt trip and undervoltage tripThese devices are submitted to temperature, overvoltage, operation, endurance anddielectric tests.

ccccc Overvoltage testThe device must be capable of withstanding 110 % of its rated voltage continuouslywithout damage (this test does not apply to a shunt trip with an "a" contactconnected in series).

ccccc OperationThe shunt trip must operate at 75 % of its rated voltage (except that shunt tripdevices for use with ground-fault protection shall operate at 55 %).The undervoltage trip must trip the circuit breaker when the voltage is less than35 % and may trip the circuit breaker between 35 and 70 % of its rated voltage andshall pickup and seal when the voltage is at 85 % or more of its rated voltage.

ccccc EnduranceThe device must be capable of performing successfully for 10 % of the number of"with current" operations of the circuit breaker.

Auxiliary and alarm switchesAuxiliary and alarm switches must be submitted to temperature, overload, enduranceand dielectric tests.

ccccc Overload testThe test consists of fifty operations making and breaking 150 % of rated current atrated voltage, with a 75-80 % power factor in ac and non-inductive load in dc.

ccccc EnduranceThe switch must make and break its rated current at rated voltage, with a 75-80 %power factor in ac, and non-inductive load in dc for 100 % of the number ofoperations "with current" for auxiliary switches, and 10 % of this number for alarmswitches.

Motor operatorThe motor operator shall perform the number of "without current" operationsindicated for the circuit breaker endurance tests. The first 25 operations shall beconducted at 85 % of the motor operator voltage rating.The circuit breaker is to be tripped during these tests.The next 25 operations shall be conducted at 110 % of the motor operator voltagerating. The balance shall be completed at rated voltage without tripping the circuitbreaker.



IEC 947-2 test proceduresStandard testsConsisting of seven parts, the IEC 947 Standard applies to all low-voltage equipmentdesigned for industrial application.Three documents are to be consulted for circuit breakers and switches.c IEC 947-1: general regulations;c IEC 947-2: circuit breakers;c IEC 947-3: switches.

The IEC 947-1 standard defines two categories of devices.

Category ADevices not specifically designed to carry out chronometric selectivity.

Category BDevices specifically designed to carry out chronometric selectivity. These circuitbreakers possess a compulsory additional characteristic: short-time withstand (Icw).

Two categories of devices

Breaking capacity

ccccc Ultimate breaking capacity: IcuIcu is the value to be taken into account when calculating an installation.The rule remains: Icu > Icc (maximum fault current of the installation).

ccccc Breaking performance during operation: IcsThis characteristic indicates the ability of the device to eliminate short-circuit currentsless than Icc and with a greater likelihood of occurring, generally near theapplication. Ics is expressed in % of Icu (values retained by the standardIEC 25-50-75-100 % of Icu).This test sequence designed to check the Ics performance, groups together on thesame device, following the breaking test (O - CO - CO), certain checks such as:v temperature rise under In;v calibration at 1.45 In;v leakage current (for devices suitable for disconnection).The leakage current should not exceed 2 mA under the application voltage(0.5 mA when new).

These checks ensure that the device is able to carry out all its functions afterelimination of a fault of Ics value and to be put back in operation; hence the notion ofbreaking power performance during operation Ics.

Function

Recognition and definition of the disconnectioncapacity for industrial low-voltage equipmentUntil recently, circuit breaker standards have laid downno regulations concerning the isolation function.Only the installation standards provided some rathervague information.The IEC 947 standard takes this function into account.In the "general regulations" section, it clearly states:c the manufacturing regulation,c the tests to be performed.The circuit breaker standard should define the mannerin which the tests are to be performed (under study).The manufacturing regulations state, for example:c Both the isolation and the inner contact distances(open > 8 mm),c A device indicating the true position of the contacts(operating handle if representative of the state of allthe contacts),c When a "locked" position is provided, this shouldonly be possible with "open" contacts.

Isolation

0 t1 t2

0.1

0.5

0.9U

1.2 50

V

tµs

12,3 kV

Uimp

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The tests to be performed are as follow:

ccccc Shock wave voltage strength (Uimp)

1.2/50 µs - 12.3 kV plus 25 % between open contacts in comparison with devices notfitted with the applied isolation function according to the figure below.The test is validated if no triggering occurs between the contacts.

ccccc Measurement of the leakage currentUnder 110 % of the device application voltagev maximum leakage currents proposed per pole:– 0.5 mA new device,– 2 mA device after Ics,– 6 mA device after Icu or after endurance tests, representative of the "end ofservice life".


Test sequencesSequence Category Tests

of devices1 - General characteristics All circuit breakers - trip unit control

- dielectric properties- mechanical and electrical endurance- overload- dielectric voltage withstand- temperature rise- 145 % calibration (3 phases test)

2 - Breaking capacity during operation All circuit breakers - breaking capacity during operation (Ot-CO-t-CO)- dielectric voltage withstand- temperature rise- 145 % calibration (3 phases test)

3 - Ultimate breaking capacity (Icu) A - 200 % calibration (each pole separately)B if Icu > Icw - ultimate breaking capacity (O-t-CO)

- dielectric voltage withstand- 230 % calibration (each pole separately)

4 - Admissible short duration current (Icw) B - 200 % calibration (each pole separately)- short-time current withstand- temperature rise- breaking capacity at admissible short-time current (O-t-CO)- dielectric voltage withstand- 200 % calibration (each pole separately)

Combined sequence Icw = Ics replaces - 200 % calibration (each pole separately)sequences 2 and 4 - short-time current withstand IcWIcw = Ics = Icu - breaking capacity at Ics (O-CO-CO) at maximum relay temp.replaces sequences - dielectric voltage withstand2, 3 and 4 - temperature rise

- 200 % calibration (each pole separately)



Routine and maintenance guidelinesRecommended inspection intervalsMerlin Gerin circuit breakers are designed to be maintenance-free. However, allequipment with moving parts requires periodic inspection to ensure optimumperformance and reliability. It is recommended that the circuit breakers be routinelyinspected six months after installation, followed by annual inspection. Intervals canvary depending on particular usages and environments.

Inspection of terminalsc Connections to circuit breaker terminals should be inspected. If there isdiscoloration due to overheating, the connections should be dissassembled and thesurface cleaned before reinstallation. It is essential that electrical connections bemade carefully in order to prevent overheating;c Check for terminal tightness.

CleaningRemove the dust and dirt that have accumulated on the circuit breaker surface andterminals.

Mechanical checksEven over long periods of time, circuit breakers are not often required to operate onoverload or short-circuit conditions. Therefore it is essential to operate the circuitbreaker periodically.To trip the circuit breaker, push the push-to-trip button.

Insulation resistance testsWhen a circuit breaker is subjected to severe operating conditions, an insulationresistance test should be performed as indicated in NEMA standard publicationNo. AB4-1996. An insulation resistance test is used to determine the quality of theinsulation between phases and phase-to-ground. The resistance test is made with adc voltage higher than the rated voltage to determine the actual resistance of theinsulation.The most common testing method employs a "megger" type instrument. A 1000 Vinstrument will provide a more reliable test because it is capable of detecting trackingon insulated surfaces. Resistance values below one megohm are unsafe and shouldbe investigated. An insulation test should be made:c between line and load terminals of individual poles with the circuit breaker contactsopen;c between adjacent poles and from poles to the metallic supporting structure with thecircuit breaker contacts closed. The latter test may be done with the circuit breaker inplace after the line and load conductors have been removed, or with the circuitbreaker bolted to a metallic base which simulates the in-service mounting.

Electrical testsThese tests require equipment for conducting pole resistance, overcurrent andinstantaneous tripping, in accordance with NEMA Standard publication No. AB4.They are not within the scope of normal field operation.

CAUTION

Molded case circuit breakers contain factory-sealedand calibrated elements. The seal must not be brokenand the circuit breaker must not be tampered with.Molded case circuit breakers should not be fieldadjusted or repaired. In the case of a malfunction, thecircuit breaker should be replaced or inspected at theGroupe Schneider factory, or by an authorizedrepresentative.

! DANGER

All tests must be made on circuit breakers which havebeen de-energized and disconnected so as to preventaccidental contact with live parts.

!

MERLIN GERIN MCB

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