Dual power automatic transfer switch can switch between normal power and reserve power automatically. Please note that the switch cannot start or stop the generator. This switch prioritizes normal power. If normal power is available, the switch will connect to normal power. If normal power fails and reserve power is available, the switch will transfer to reserve power. Wire: Press the button to Auto mode for automatic switching between normal and reserve power. Press the button to Manual mode to switch the power source manually. The automatic transfer switch is a terminal-type device suitable for 3-phase 4-wire (or 1-phase 2-wire) dual power systems with AC 50/60Hz, rated voltage of 230V, and rated current up to 63A. When a power failure occurs (detects loss of voltage or phase on Phase A for both normal and reserve power), it automatically transfers one or more load circuits from the failed source to the active source to ensure continuous power supply. Rated voltage: AC 230V 50/60Hz Note: Power will be interrupted during switching. Maximum current: 63A Color: Grey + Black + Blue Material: PC plastic Package Contents: 1 x Automatic Transfer Switch Only the above package content is included; other items are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error is allowed within +/- 1-3cm.