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

Specifications:
Type: 2P, 4P (optional)
Rated working current: 63A, 100A, 125A (optional)
Material: PC
Main color: black+white
Package size:
2P: 112 * 103 * 82mm / 4.4 * 4.1 * 3.2in
4P: 146 * 103 * 82mm / 5.7 * 4.1 * 3.2in
Package weight:
2P: 560g / 1.2lb
4P: 750g / 1.7lb

Packing List:
1 * Automatic Transfer Switch