Power distribution box is a kind of distribution box and the last equipment of distribution system. Distribution box is a low-voltage distribution device which assembles switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or screen according to the requirements of electrical wiring. In normal operation, the circuit can be switched on or off by manual or automatic switch. When a fault or abnormal operation occurs, the circuit is cut off or the alarm is given by means of a protective device. By means of measuring instrument, various parameters in operation can be displayed, some electrical parameters can be adjusted, and the deviation from normal working state can be prompted or signaled.

Distribution boxes are divided into cabinet distribution boxes and small distribution boxes. Because of their simple operation, easy maintenance, low price, flexible and convenient use, they can be widely used in low-voltage distribution systems of industrial, hotel, office building, airport, hospital and other stations as protection and distribution of electrical equipment.

Production reference standards: GB7251.1, IEC60439.