Automatic Transfer Switches Model: YES1-N/YES1-C Current: 32A~125A Pole: 2P, 3P, 4P YES1 is suitable for transferring between two circuits of power supply(MAIN power supply, EMERGENCY power supply) in AC 50Hz, rated working voltage to 220V and rating current up to 32A~125A, Function: over voltage, under voltage, lost phase, Utility to Utility Utility to generator(With a passive contact sent a signal to start or shut off the generator) Attention: It must not do the test of insulating stand voltage for the quality guarantee.