This dual automatic transfer switch is PC level, household transfer switch. When the normal city is abnormal,  the back works at once, no Interrupt, ensures the continuirty, reliability, and safety of powersupply.

Features:
Compact size, suitable for most household distribution box.
Automatic , switching less than 50ms.
Manual/automatic 2 modes, switch at will.
Made of fine quality PC material for safer use and long using .
Ensures the continuirty, reliability, and safety of powersupply.

Specifications:
Type: W2R-2P , W2R-2P , W2R-3P , W2R-3P , W2R-4P , W2R-4P (optional)
Material: PC
Main color: black+white
Item size:
2P: 107 * 96 * 70mm / 4.2 * 3.8 * 2.8in
3P: 125 * 96 * 70mm / 4.9 * 3.8 * 2.8in
4P: 142 * 96 * 70mm / 5.6 * 3.8 * 2.8in
Package size: 158 * 140 * 105mm / 6.2 * 5.5 * 4.1in
Package weight: 713g / 1.6lb

NOTE: The rated voltage of the common and backup powersupply MustIn 85%-110%, and the current cannot be less than 5A, otherwise the coil will heat or even spontaneously burn. If your city voltage not stable, please kindly add voltage protectors in system.

Packing List:
1 * Automatic Transfer Switch