Covers low voltage power circuit breakers (1000 volts ac or less), low voltage power circuit breakers (3200 volts dc or less), and low voltage ac secondary network protectors. Includes the following sections: definitions for power switchgear; test procedures for low voltage ac power circuit protectors; enclosed field discharge circuit breakers for rotating electric machinery; application guide for low voltage ac non integrally fused power circuit breakers (using separately mounted current limiting fuses).