1、[for Dual Power Supply] Public power supply must be urban power supply, and the backup power supply must be the alternator. 2、[Automatic Mode] When only one power supply is working, the switch will automatically switch to that one. When public and standby power supply are provided at the same time, public power supply is preferred. 3、[Ensure Continuity] When the normal power supply is abnormal, the standby power supply works immediately, thus ensuring the continuity, reliability and safety of the power supply. 4、[PC Shell] Adopt flame retardant PC material, with good insulation, high temperature resistance, aging resistance, safe and reliable. 5、[Convenient Installation] The transfer switch is reasonable in structure, small in size, convenient for installation and maintenance. 1 x Dual Power Automatic Switch1 x User Manual Item Type: Dual Power Automatic SwitchMaterial: PCRated Working Voltage: 220V ACRated Voltage (Ue): AC 400VRated Insulation Voltage (Ui): AC 690VControl Voltage: AC 220VLife: Electronic: 2000 times, mechanical: 5000 timesAuxiliary Circuit: AC220V AC110V 50 60HzImpulse Resistance Voltage: 8KVOperation Mode: Automatic and manualNumber of Poles: 2P