This guide applies to low-voltage power circuit breakers of the 600-voIt insulation class with separately mounted current-limiting Class J and Class L fuses for use on ac circuits with available short-circuit currents of 200 000 amperes (rms symmetrical) or less. Low-voltage integrally fused power circuit breakers (see American National Standard Low-Voltage A C Integrally Fused Power Circuit Breakers@ C37.28-1969) and combinations of fuses and molded-case circuit breakers are not covered by this guide. Purpose This guide sets forth recommendations believed essential for the selection of Class J and Class L current-limiting fuses meeting N E M A Standard on Low-Voltage Fuses@ FU 1-1966@ and American National Standard Low-Voltage Cartridge Fuses 600 Volts or Less@ C97.1- 1972@ for use in combination with low-voltage power circuit breakers@ rated in accordance with American National Standard Low-Voltage A C Power Circuit Breakers (600-Volt Insulation Class) C37.13-1963.
IEEE C37.27-1972 history
2015IEEE C37.27-2015 Guide for Low-Voltage AC (635 V and below) Power Circuit Breakers Applied with Separately- Mounted Current-Limiting Fuses
2008IEEE C37.27-2008 Application Guide for Low-Voltage AC Power Circuit Breakers Applied with Separately-Mounted Current-Limiting Fuses
1987IEEE C37.27-1987 Standard Application Guide for Low-Voltage AC Nonintegrally Fused Power Circuit Breakers (Using Separately Mounted Current-Limiting Fuses)
1972IEEE C37.27-1972 Application Guide for Low-Voltage AC non-integrally fused power Circuit Breakers (using Separately-Mounted Current-Limiting Fuses)