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 1058 V, 730 V, 635 V (600 for units incorporating fuses), 508 V, and 254 V for application on systems having nominal voltages of 1000 V, 690 V, 600 V, 480 V, and 240 V.

b. Unfused or fused type circuit breakers

c. Manually operated or power operated circuit breakers with or without electromechanical or solidstate 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.