NEMA C37.50 Switchgear Low Voltage AC Power Circuit Breakers Used in Enclosures - Test Procedures
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NEMA C37.50 Document Information:
Title
Switchgear Low Voltage AC Power Circuit Breakers Used in Enclosures - Test Procedures
National Electrical Manufacturers Association
Publication Date:
Jan 1, 1989
Scope:
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 rated maximum voltages of 635 (600 for units incorporating fuses), 508, and 254 V for application on systems having nominal voltages of 600, 480, and 250 V.
(2) (a) Unfused circuit breakers
(b) Fused circuit breakers
(3) Manually operated or power-operated circuit breakers with or without electromechanical or solid-state trip devices.
NOTE: In this standard the words “circuit breaker” shall mean “enclosed low-voltage ac power circuit breaker,” either fused or unfused. The words "unfused circuit breaker’’ shall mean a “circuit breaker without integral fuses” and the words “fused circuit breaker” shall mean a “circuit breaker incorporating current-limiting fuses as an integral part of the unit.”
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