Distribution box is the electrical wiring requirements of switchgear, measuring instruments, protective appliances and auxiliary equipment assembled in a closed or semi-closed metal cabinet or on the screen, forming a low-voltage distribution device. During normal operation, the circuit can be switched on or off with manual or automatic switching. Fault or abnormal operation of the use of protective equipment to cut off the circuit or alarm. The measuring instrument can display various parameters in operation, and some electrical parameters can be adjusted to indicate or signal the deviation from the normal working condition. Commonly used in the hair, distribution, substation.