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NEMA - ANSI/NEMA C37.50

Switchgear - Low Voltage AC Power Circuit Breakers Used in Enclosures - Test Procedures

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Organization: NEMA
Publication Date: 1 January 2012
Status: active
Page Count: 39
scope:

This standard covers the test procedures for enclosed low-voltage ac power circuit breakers as follows:

a) Stationary or drawout circuit breakers of two-or three- or four-pole construction, with one or more rated maximum voltages of 635 V (600 for units incorporating fuses), 508 V, and 254 V for application on systems having nominal voltages of 600, 480, and 240 V.

b) Unfused or fused type circuit breakers

c) Manually operated or power-operated circuit breakers with or without electromechanical or solid-state trip devices.

d) Fused drawouts consisting of current-limiting fuses in a drawout assembly intended to be connected in series with a low-voltage ac power circuit breaker to form a non-integrally fused circuit breaker.

Note: In this standard the term circuit breaker shall mean enclosed low-voltage ac power circuit breaker, either fused or unfused. The term unfused circuit breaker shall mean a circuit breaker without either integrally or non-integrally mounted fuses, and the term fused circuit breaker shall mean a circuit breaker incorporating either integrally or non-integrally mounted current limiting fuses.

This document applies to both integrally and nonintegrally fused circuit breakers.

Document History

January 1, 2018
Switchgear - Low Voltage AC Power Circuit Breakers Used in Enclosures - Test Procedures
This Standard covers the test procedures for enclosed low-voltage AC power circuit breakers as follows: a. Stationary or drawout circuit breakers of two-or-three- or four-pole construction, with one...
ANSI/NEMA C37.50
January 1, 2012
Switchgear - Low Voltage AC Power Circuit Breakers Used in Enclosures - Test Procedures
This standard covers the test procedures for enclosed low-voltage ac power circuit breakers as follows: a) Stationary or drawout circuit breakers of two-or three- or four-pole construction, with one...
January 1, 1989
For Switchgear— Low-Voltage AC Power Circuit Breakers Used in Enclosures— Test Procedures
This standard covers the test procedures for enclosed low-voltage ac power circuit breakers as follows: (1) Stationary or drawout circuit breakers of two- or three-pole construction, with one or...
January 1, 1989
Switchgear Low Voltage AC Power Circuit Breakers Used in Enclosures - Test Procedures
This standard covers the test procedures for enclosed low-voltage ac power circuit breakers as follows: (1) Stationary or drawout circuit breakers of two- or three-pole construction, with one or more...

References

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