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Released: 13.12.2024
IEEE C37.27-2024
IEEE Guide for Low-Voltage AC (635 V and below) Power Circuit Breakers Applied with Separately-Mounted Current-Limiting Fuses
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Standard number: | IEEE C37.27-2024 |
Released: | 13.12.2024 |
ISBN: | 979-8-8557-1497-5 |
Pages: | 21 |
Status: | Active |
Language: | English |
DESCRIPTION
IEEE C37.27-2024
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 200000 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.This guide sets forth recommendations believed essential for the selection of current-limiting fuses by the user (see NEMA FU-16 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™. NOTE--The combination of a circuit breaker and separately mounted fuses is limited to 600 V based on fuse maximum voltage ratings.
Revision Standard - Active. Application recommendations to assist in selection of separately mounted current-limiting fuses to be installed in series with low-voltage ac power circuit breakers are provided in this guide.