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 Switch Material: PC Rated Working Voltage: 400V AC Rated Voltage (Ue): AC 400V Rated Insulation Voltage (Ui): AC 690V Control Voltage: AC 220V Life Span: Electronic: 2000 times, mechanical: 5000 times Auxiliary Circuit: AC220V, AC110V 50, 60Hz Shock Resistance Voltage: 8KV Operation Mode: Automatic and manual Number of Poles: 4P. Package List: 1 x Double Power Automatic Transfer Switch1 x Instruction Note: In automatic mode, forcibly rotating the power switch handle will damage the transfer switch