1. Automatic transfer switch can switch between normal power and reserve power automatically. 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 set to Automatic mode for automatic switching between normal and reserve power. Press the button to set to Manual mode for manual switching. 3. The Automatic Transfer Switch is a terminal type automatic transfer device suitable for 3-phase 4-wire (or 1-phase 2-wire) AC 50/60Hz power systems, with a rated voltage of 230V and a maximum current of 63A. When a power failure occurs (voltage loss or phase loss detected on Phase A for both normal and reserve power), it automatically transfers connected 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 items are included; others are not included. Note: Lighting and display differences may cause slight variations in color compared to the actual item. Measurement error is allowed within +/- 1-3 cm.