The main structure consists of a box, insulated wires, a small circuit breaker, an electric energy meter, a nameplate and other components. The box is made of fiberglass die-casting. There are knock-out holes for cables to enter and exit the box. The hole size is standard and can also be specially opened according to the user's special requirements.

The switch handle is equipped with an outer door structure. The user can open the outer door to open and close the switch, which can effectively prevent electric shock accidents.