1. Automatic transfer switch can switch to normal power or reserve power automatically. Please note that the switch cannot turn on or off the generator. This switch prioritizes normal power. If normal power is available, the switch will connect to normal power. If normal power is off and reserve power is on, the switch will transfer to reserve power. 2. Wiring: Press the button to Automatic mode, and the switch will transfer between normal and reserve power automatically. Press the button to Manual mode, then you must switch the direction manually. 3. The automatic transfer switch is a terminal-type automatic transfer device. It is suitable for 3-phase 4-wire (or 1-phase 2-wire) AC 50/60Hz power grids, with a rated voltage of 230V and a maximum current of 63A. When one power source fails (only phase A voltage is monitored for both normal and reserve power; detects loss of voltage or phase), it automatically transfers one or more load circuits from the failed source to the active source to maintain 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 the color of the item in the image compared to the actual product. Measurement error is permitted within +/- 1-3 cm.