Dual power automatic transfer switch automatically switches between normal power and reserve power. 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 connects to reserve power. Set the mode to Automatic to enable automatic switching between power sources. Set the mode to Manual to 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 grids with AC 50/60Hz, rated voltage 400V/230V, and rated current up to 63A. It monitors Phase A voltage from both normal and reserve power sources to detect 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. This automatic transfer switch conforms to 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 image and actual product. Measurement error allowance is +/- 1-3 cm.