Automatic Change Over and Phase Change Over Switch is designed to be installed with three-phase supply. The Switch is the combination of Automatic Change Over and Phase Change Over Switch that automatically transfers load from mains to generator and from generator to mains. The Switch also gives output of all the three phase either one or two phases are missing, and after the return or present of all three phase it diverts automatically to its originating phase. The Automatic Change Over and Phase Change Over Switch comes in four poles design and does not require any operator.