The switchgear, measuring instruments, protective appliances and auxiliary equipments are assembled in the enclosed or semi-enclosed metal cabinet or on the screen to form a low-voltage distribution device according to the requirements of electrical wiring. In normal operation, the circuit can be switched on or off with the help of manual or automatic switches. Cut off the circuit or alarm with the help of protective electrical apparatus when the fault or abnormal operation. By means of measuring instruments, various parameters in operation can be displayed, and some electrical parameters can be adjusted to indicate or signal deviation from normal working state. Commonly used in the hair, distribution, substation.
