Feature:1. AUTOMATIC MODE: When only one power source is working, the switch will automatically switch to that power source. When both public and standby power sources are provided, priority will be given to the public power source.2. RESPONSIVE: When the normal power supply is abnormal, the backup power supply works immediately, thus ensuring the continuity, reliability and safety of the power supply.3. FLAME RESISTANT MATERIAL: The shell is made of PC material, which has good insulation, high temperature resistance and anti aging, safe and reliable.4. EASY INSTALLATION: Reasonable structure, small size, easy installation and maintenance, convenient and reliable power supply installation.5. WIDE APPLICATION: The switch is mainly used in hospitals, stores, banks, chemical industry, metallurgy, high rise buildings, military facilities and other important occasion where power failure is not allowed.Specification:Item Type: Double Power Automatic Transfer SwitchMaterial: PCRated Working Voltage: 400V ACRated Voltage (Ue): AC 400VRated Insulation Voltage (Ui): AC 690VControl Voltage: AC 220VLife Span: Electronic: 2000 times, mechanical: 5000 timesAuxiliary Circuit: AC220V, AC110V 50, 60HzShock Resistance Voltage: 8KVOperation Mode: Automatic and manualNumber of Poles: 4P.Package List:1 x Double Power Automatic Transfer Switch1 x InstructionNote:In automatic mode, forcibly rotating the power switch handle will damage the transfer switch