Install breaker or power distribution boxes that match with the power of mainframe before the input cable of mainframe to isolate mainframe and mains supply. Taking into account the impulse current of power on moment, the breaker be selected must be 1.5~2 Times of Maximum current of Mainframe, and breaker should not with leakage protection to avoid improper operation of breaker. Selection of breaker please see details at table 4.3 -1: