The distribution box is a massive parameter on the data. Generally, it constitutes a low-voltage forest according to the electrical wiring. It is required to assemble switchgear, measuring instruments, protective appliances and auxiliary equipment in closed or semi-closed metal cabinets or screens to form low-voltage power distribution box. During normal operation, the circuit can be switched on or off with the help of manual or automatic switches. The distribution box is a switchgear, measuring instrument, protective appliance and auxiliary equipment assembled in a closed or semi-closed metal cabinet or screen according to the electrical wiring requirements to form a low-voltage distribution box. During normal operation, the circuit can be switched on or off with the help of manual or automatic switches. In the event of malfunction or abnormal operation, the protection circuit is used to cut off the circuit or give an alarm. Various measuring parameters can be displayed by measuring instruments, and some electrical parameters can be adjusted to indicate or signal the deviation from normal working conditions.