W-C-375-SUP-2 Circuit Breakers, Molded Case; Branch Circuit and ServiceThis specification covers the general requirements and test procedures for molded case circuit breakers which fall within the general parameters specified in table XVI which are specifically designed to provide service-entrance, feeder, meter-service, or branch circuit protection and rated at not more than 4,000 amperes and 600 volts ac, 60 hertz Hz see 3.1 and 6.1.

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Examination or test

Circuit breaker design  1/

Requirement paragraph

Method paragraph

Fully magnetic

breakers

2/

Uncompensated thermal magnetic

breakers  2/

Compensated thermal

magnetic

breakers

40°C  5/

Fused uncompensated

thermal

magnetic breakers

40°C

25°C

40°C  4/

Group I  6/ Visual and mechanical

examination - - - - - - - -

Calibration

200% at 25°C - - - - - - -

125% at 25°C - - - - - - -

135% at 25°C - - - - - - -

200% at 40°C - - - - - - -

125% at 40°C (after carrying rated current)

Calibration of adjustable magnet trip (when

applicable)- - - - - - - - -

Overload  - - - - - - - - - - - Tungsten lamp load  7/- -

100% calibration at

40°C  8/  - - - - - - - - - - Temperature and 100%

calibration at 25°C - - - Endurance  - - - - - - - - - - Short circuit - - - - - - - - - - Dielectric withstanding

voltage  - - - - - - - - - - -

x x

x

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x x x

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x

x

x

x x

x

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x x x

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x

x

x x

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x x x

x x

x

x

x

x x

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x

x x x

x x

x

x

x

x x

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x x

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x x

x

x

x

3.1 thru

3.4.12, 3.21, and 3.22

3.5

3.5.1

3.6

3.7

3.8

3.9

3.10

3.11

3.12

4.7.1

4.7.2

4.7.2.1

4.7.3

4.7.4

4.7.5

4.7.6

4.7.7

4.7.8

4.7.9.1

Group II  6/

200% calibration at 25°C Short circuit interruption -

250% calibration at 25°C Dielectric withstanding

voltage  - - - - - - - - - - -

x x x

x

x x x

x

x x x

x

x x x

x

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3.13

3.14

3.15

3.12

4.7.10

4.7.11

4.7.12

4.7.9.2

Group III  6/

Special short circuit Crossover (current limiters or fuses)  9/ - Crossover (dummy

fuses)   10/- - - - - - - Maximum IC  11/ - - - - Maximum energy

(when applicable) 11/

250% calibration at 25°C Dielectric withstanding

voltage  - - - - - - - - - - -

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x x

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x x

x

3.16

3.17

3.18

3.19

3.15

3.12

4.7.13

4.7.14

4.7.15

4.7.16

4.7.12

4.7.9.2