Including PZ box, socket box, lighting distribution box, etc. PZ box is suitable for use in ac fifty hz, rated voltage 220 v and 380 v, distribution box bus maximum current 100 a and the following circuit, for single phase three line, three phase four wire system at the end of the small capacity power distribution with. Lighting distribution box is suitable for industrial and civil architecture. As lighting distribution, but also can be used as 63 a and the following power, circuit leakage, overload, short circuit protection. Power socket box can be used as power equipment overload, short circuit, leakage protection and circuit switch, etc.