Dual power automatic transfer switch automatically switches between normal power and reserve power. This 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. Set the switch to Automatic mode to enable automatic transfer between power sources. Set to Manual mode to manually select the power source. 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 grids with AC 50/60Hz, rated voltage 400V/230V, and rated current up to 63A. The device monitors Phase A voltage of both normal and reserve power sources, detecting loss of voltage or phase failure. Upon detection, it 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 includes: 1 x Dual power automatic transfer switch Note: Other items not included. Slight color variations may occur due to lighting and display differences. Measurement error allowed is +/- 1-3 cm.