Low-voltage protective devices consist of protective devices for low-voltage
MCCBs, insulated case circuit breakers, draw-out power circuit breakers,
overload relays, and ground fault protective (GFP) devices. The protective
devices are integral parts of the circuit breakers, and motor starters and their
maintenance and testing should be coordinated with the maintenance of the
circuit breakers, motor starters, and switchgear assemblies. Low-voltage protective
devices are classifi ed as low-voltage power circuit breaker trips, MCCB
trips, overload relays, and ground fault sensing and relaying equipment.