Model number:yes1-32c Automatic transfer switches Model:yes1-n/yes1-c Current:16a~32a 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 16a~32 a, 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.