Tomzn 2P Automatic Transfer Switch ATS Changeover 63A/125A - 230V MCB typeRated voltage 220V 5060HZMax current 63A amp 125A1 Dual power Automatic transfer switch can switch to Normal power or reserve power automatically Please noted that the switch cant turn on or turn off the generator This switch Normal power first If normal power on the switch will switch to Normal power If normal power off and reserve power on the switch will switch to reserve power2WirePress the button to Automatic the switch will switch to Normal