scope:

These requirements cover low-voltage ac power circuit breakers as follows:

a) Stationary-mounted or drawout-mounted types,

b) 2-pole, 3-pole, and 4-pole constructions,

c) Manually operated or power operated, and

d) With or without electromechanical or solid-state type trip device.

These requirements apply to drawout-mounted type low-voltage ac integrally fused power circuit breakers, consisting of low-voltage ac power circuit breakers with integral current limiters or fuses.

These requirements apply to low-voltage ac fuse draw-outs consisting of current limiters or fuses in a drawout assembly intended to be connected in series with a low-voltage ac power circuit breaker to form a fused circuit breaker.

These requirements apply to general purpose type low-voltage dc power circuit breakers.

These requirements cover equipment intended for use in ordinary locations in accordance with the National Electrical Code, ANSI/NFPA 70.

These requirements are intended to supplement and be used in conjunction with the:

a) Standard for Low-Voltage AC Power Circuit Breakers Used In Enclosures, IEEE C37.13,

b) Standard for Low-Voltage DC Power Circuit Breakers Used In Enclosures, IEEE C37.14,

c) Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear, IEEE C37.20.1,

d) Test Procedures for Switchgear - Low-Voltage AC Power Circuit Breakers Used In Enclosures, ANSI C37.50, and

e) Conformance Test Procedures for Switchgear - Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies, ANSI C37.51.

These requirements cover equipment rated 1000 V or less nominal, 1058 V maximum ac and 1500 V maximum dc.

This Standard does not apply to molded-case circuit breakers.

These circuit breakers are intended for installation in circuit breaker enclosures, switchboards (switchgear), panelboards, and the like. Drawout-mounted devices are intended for use with specific adapters or receiving equipment. The acceptability of the combination of a circuit breaker with respect to any overall enclosure will be determined when the complete product is considered.