4P 63A Automatic Power Switch This dual power automatic transfer switch can make common power supply and backup power switch easy. When the common power supply is cut off, the emergency power supply is supplied, and when the common power supply comes, it is restored to the common power source. Switching time is only 2 seconds. Automatic switching saves more problems in maintaining continuous power supply. Dimension : 198mm*122mm Wide Application ： This switch can be used in home and public places, especially suitable for office buildings and public places that require fire fighting. Fast Switching: It can easily switch main power supply and emergency power supply, and the switching time only takes 2 seconds. Complete protection function ：This switch supports various protection functions, including short circuit, overload, no phase, pod protection voltage. High quality and durability for long life. Manual automatic integration : It is equipped with manual and automatic switching buttons. The two-position color switch is set in the left position for automatic mode and we the correct position for manual mode, thus meeting different needs.