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. Item Type: Dual Power Automatic Switch Material: PC Rated Working Voltage: 220V AC Rated Voltage (Ue): AC 400V Rated Insulation Voltage (Ui): AC 690V Control Voltage: AC 220V Life: Electronic: 2000 times, mechanical: 5000 times Auxiliary Circuit: AC220V AC110V 50 60Hz Impulse Resistance Voltage: 8KV Operation Mode: Automatic and manual Number of Poles: 2P 1 x Dual Power Automatic Switch 1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin