Classified according to the requirements of the power supply system:

1) First-level power distribution equipment, collectively referred to as power distribution center. They are centrally installed in the company's substations and distribute electrical energy to substations at different locations. This level equipment is close to the step-down transformer, so the electrical parameters are higher and the output circuit capacity is larger.

2) Secondary power distribution equipment is the collective name for power distribution cabinets and motor control centers. Power distribution cabinets are used in applications where the load is relatively decentralized and there are few loops; the motor control center is used in applications where the load is concentrated and there are many loops. They distribute the electrical energy of a certain circuit of the upper distribution equipment to the nearest load. This class of equipment should protect, monitor and control the load.

3) The final power distribution equipment is collectively referred to as the lighting power distribution box. They are far away from the power supply center and are distributed small-capacity power distribution equipment.

Classified by structural features and uses:

1) Fixed panel switchgear, often called switchboard or power distribution panel. It is an open-type switchgear with panel cover. It has a protective function on the front, and it can still touch live parts on the back and side. It has a low protection level and can only be used for industrial and mining enterprises that require low power supply continuity and reliability. Substation centralized power supply.

2) Protected (ie closed) switchgear refers to a low-voltage switchgear which is closed on all sides except the mounting surface. The electrical components such as switchgear, protection and monitoring control of the cabinet are all installed in a closed enclosure made of steel or insulating material and mounted on a reliable wall or off the wall. There may be no isolation between each circuit in the cabinet. It may also use grounded metal plates or insulation plates for isolation. Normally, the door is mechanically interlocked with the main switch operation. There is also a protected type switchgear (ie, a console) with control, measurement, and signal electronics. Protective switchgear is mainly used as a power distribution device at the process site.

3) drawer switchgear. This kind of switchgear uses a steel plate to make a closed enclosure. The electrical components of the inlet and outlet circuits are all installed in drawers that can be extracted to form a functional unit that can fulfill a certain type of power supply task. Between the functional unit and the bus or cable, separated by a grounded metal plate or a plastic function board, the busbar, the functional unit and the cable are formed in three areas. There are also isolation measures between each functional unit. Drawer-type switchgears have high reliability, safety and interchangeability. They are relatively advanced switchgears, and switchgears are produced, most of which are drawer-type switchgears. They are suitable for industrial and mining enterprises and high-rise buildings requiring high reliability of power supply as a centralized power distribution center.

4) Power and lighting distribution control box. Mostly closed vertical installation. Due to different occasions, the degree of protection of the shell is also different. They mainly serve as power distribution devices for industrial and mining enterprises.

Features, types and functions:

1) It is easy to manage and it is helpful to repair when circuit failure occurs.

2) Distribution boxes and distribution cabinets, switchboards, and power distribution screens are complete sets of equipment for centralized installation of switches and meters (pictured).

3) The common distribution boxes are made of wood and iron plate.

4) The purpose of the distribution box: Of course, it is convenient to stop and send electricity, and it plays the role of metering, judgment stop, and power transmission.