Motor-protective cirucit-breakers are circuit breakers used for switching, protection and isolation of circuits primarily associated with motor loads.
At the same time, they protect these motors against destruction from locked-motor starting, overload, short-circuit and phase-failure in three-phase power supplies. They have thermal trip blocks or electronic releases for protection of the motor winding with overload protection and electromagnetic release with short-circuit protective device.
The following accessories can be fitted to motor-protective circuit-breakers:
●Trip-indicating auxiliary contacts;