Dual power automatic transfer switch automatically switches between normal power and reserve power. Please note that the switch cannot start or stop the generator. The switch prioritizes normal power. When normal power is available, the switch connects to normal power. When normal power is off and reserve power is on, the switch transfers to reserve power. Press the button to set to Automatic mode, and the switch will transfer automatically between normal and reserve power. Press the button to set to Manual mode, and you must manually select the power source. Note: power interruption occurs during switching. TOQ3D is a terminal-type automatic transfer device suitable for 3-phase 4-wire (or 1-phase 2-wire) dual power systems with AC 50/60Hz, rated voltage 400V/230V, and rated current up to 63A. When one power source fails (only Phase A voltage is monitored for both normal and reserve power; detects loss of voltage or phase), the device automatically transfers one or more load circuits from the failed source to the active source to maintain power supply. The automatic transfer switch complies with IEC60947-6-1 and GB/T14048.11 standards. Color: White Material: ABS Size: 150 x 138 x 111 mm Package Contents: 1 x Dual power automatic transfer switch Note: Other items not included. Lighting and display differences may cause slight color variations between the image and actual product. Measurement error allowed is +/- 1-3 cm.