This product is suitable for single-phase three-wire or three-phase five-wire terminal circuits with AC frequency of 50Hz, rated working voltage of 220V or 380V, and rated current not exceeding 125A , short circuit, leakage, undervoltage protection, the box can be equipped with various molded case circuit breakers, small circuit breakers, miniature disconnectors, miniature leakage protectors, modular sockets, special modular timing devices and wave Surge protectors, etc., can be widely used in modern hotels, commercial industrial and mining enterprises and civil residences and other buildings.