Automatic transfer switch can switch to Normal power or reserve power automatically. that the switch can't turn on or turn off the generator. This switch Normal power first. If normal power on, the switch will switch to Normal power. If normal power off, and reserve power on, the switch will switch to reserve power. Wire: Press the button to Automatic, the switch will switch to Normal power or reserve power automatically. Press the button to Manual, Then you have to switch the Direction manually. Rated: voltage 380V 50/60HZ Max current: 63A. : power will be interrupted when Switching. Switch time Less than 4S 1.Application: TOQ3D is terminal type automatic transfer device. It's suitable for 3 phases 4 wires (or 1 phase 1 wire) grid with AC 50/60Hz, rated voltage 400V/230V and rated current up to 63A. When one power goes wrong (only test normal Phase A voltage and reserve Phase A voltage, only test loss voltage or loss phase),it will automatic connect one or load circuits from one power to the other power automatically, to normal power supply of load circuits. The automatic transfer switch conforms to IEC60947-6-1 and GB/T14048.11. 2.Normal conditions for operation and installation: Environmental Temperature Condition:-5~+40C Installation site is not more than 2000 above sea level. Pollution Level: Grade 3 Installation Category: 3 Vertical installation or horizontal installation Colour:White :plastic type:2 Input 2 Output Package Contents: 1 x switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.