Technical Parameter Line Voltage AC110V, Line Current 6A63A, Operating Frequency 50HZ60HZ, Conversion Time 2S or so; Installation Dimension 128mm*122mm hole M6 Automatic Manual This automatic switch not only support auto mode, also can be operated by manual button, simple operation and reliable performance. When one power goes wrong only test normal Phase A voltage and reserve Phase A voltage, only test loss voltage or loss phase, it will automatic connect one or several load circuits from one power to the other power automatically, to ensure normal power supply of load circuits Protection Function The switch supports multiple protection functions, including short circuit, overload, phase loss, and undervoltage protection Easy installation Reasonable structure, small size, equipped with protective cover, power supply is easy to install and reliable with Electronic Instruction Manual Wide application This switch can be used for home and public places, especially suitable for office buildings and public places which requiring fire fighting