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IEEE C37.27

2015 Edition, December 5, 2015

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Guide for Low-Voltage AC (635 V and below) Power Circuit Breakers Applied with Separately- Mounted Current-Limiting Fuses



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Description / Abstract:

This guide applies to unfused low-voltage ac power circuit breakers of the 635 V maximum voltage class with separately-mounted current-limiting fuses for use on ac circuits with available short-circuit currents of 200 000 A (rms symmetrical) or less. Low-voltage ac fused power circuit breakers and combinations of fuses and molded-case circuit breakers are not covered by this guide.

In this guide, the term circuit breaker means unfused low-voltage ac power circuit breaker.

Purpose

This guide sets forth recommendations believed essential for the selection of current-limiting fuses (see NEMA FU-1 and UL 248-1) for use in combination with low-voltage ac power circuit breakers, rated in accordance with IEEE Std C37.13™ and applied in metal-enclosed low-voltage power circuit breaker switchgear in accordance with IEEE Std C37.20.1™.