About this item WIDE APPLICATION : Thispower automatic transfer switch is widely used for places such as homes , shopping malls , factories , latories , farms , etc QUICK RESPONSE : power auto transfer switch can be operated automatically or manually , with millisecond switching without power outage , compact structure , transmission , convenient installation and maintenance , and long service life PC , SILVER MATERIAL : The shell is made of premium PC material , flame retardant , high temperatureand insulated . And silver is anti aging and improves conductivity and life span . CONTINUOUS POWER SUPPLY : When there is an abnormality in normal power supply , the backup power supply will immediately work to ensure the continuity of power supply . When the normal power supply is turned on , it will automatically switch back from the backup power supply to the normal power supply . STANDARD 35MM RAIL INSTALLATION : This automatic transfer switch is suitable for emergency power supply systems with a 50 or 60Hz AC rated 110V 80A . Designed specifically for household rail installation and is specifically designed for PZ30 distribution boxes .