A motor protection circuit breaker, or MPCB, is a specialized electromechanical device that can be used with motor circuits of both 60 Hz and 50 Hz. It has several functions that allow it to provide a safe electrical supply for motors: ... The MPCB can interrupt any electrical fault that is below its breaking capacity.
The circuit breaker failure protection provides a backup protection in the case, that the local circuit breaker fails to clear a system fault. ... The breaker failure protection function evaluates, whether the local circuit breaker has fully opened and cleared a fault in the event of an external trip signal.
Motor protection is used to prevent damage to the electrical motor, such as internal faults in the motor. ... Motor protection schemes have several protection functions to consider: Motor horsepower rating and type. Supply characteristics such as voltage, phases, method of grounding, and available short-circuit current.