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 circuitbreakers b) Fused circuit breakers 3) Manually operated or power-operated circuit breakers with or without electromechanical or solid-state trip devices.
ANSI C37.50-2012 history
1970ANSI C37.50-2018 American National Standard for Switchgear— Low Voltage AC Power Circuit Breakers Used in Enclosures—Test Procedures
2012ANSI C37.50-2012 Low Voltage AC Power Circuit Breakers Used in Enclosures - Test Procedures