Features Automatic Mode: Automatically switches to the active power source, prioritizing the public power source when both are available, ensuring uninterrupted power supply. Responsive: Immediately activates the backup power supply when the normal power source fails, guaranteeing continuous, reliable, and safe power supply. Flame Resistant Material: Constructed with PC material for excellent insulation, high temperature resistance, and anti-aging properties, ensuring safety and reliability. Easy Installation: Compact design and simple installation process make for convenient and reliable power supply setup and maintenance. Wide Application: Ideal for critical settings such as hospitals, stores, banks, chemical industry, and military facilities where uninterrupted power supply is essential. 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: 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 Note: In automatic mode, forcibly rotating the power switch handle will damage the transfer switch Package List 1 x Double Power Automatic Transfer Switch 1 x Instruction