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What is a distribution box?

source:jinzhong transmission and distribution   time:2021-03-01   Number of hits:677of hits

What is a distribution box? A total circuit distribution box for all users.

working principle

According to the requirements of electrical wiring, the distribution box is to assemble the switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi closed metal cabinet or panel to form a low-voltage distribution device. During normal operation, the circuit can be turned on or off with the help of manual or automatic switch. In case of fault or abnormal operation, cut off the circuit or give an alarm with the help of protective appliances. By means of measuring instruments, various parameters in operation can be displayed, and some electrical parameters can be adjusted to prompt or send signals for deviation from normal working state. It is commonly used in power generation, distribution and substation.


It is convenient for management and maintenance when circuit failure occurs. Distribution box and distribution cabinet, distribution board, etc. are complete sets of equipment for centralized installation of switches, instruments, etc. There are two kinds of commonly used distribution boxes: wooden and iron. Now the power consumption is very large everywhere, so the iron is used more.

The purpose of the distribution box: of course, it is convenient to stop and send electricity, and plays the role of measuring and judging the stop and send electricity.


According to structural features and uses:

(1) Fixed panel switch cabinet, often called switch board or distribution panel. It is a kind of open type switch cabinet with panel barrier. The front side has protective effect, and the back and side can still touch the live parts. The protection level is low. It can only be used in industrial and mining enterprises with low requirements for continuity and reliability of power supply for centralized power supply in Substation.

(2) Protective (i.e. enclosed) switch cabinet refers to a low-voltage switch cabinet with all sides closed except the mounting surface. The switch, protection, monitoring control and other electrical components of the cabinet are all installed in a closed shell made of steel or insulating materials, which can be reliably installed on or off the wall. Each circuit in the cabinet can be isolated without isolation measures, or with grounded metal plate or insulating plate. Generally, the door is mechanically interlocked with the main switch. In addition, there is a protective platform type switch cabinet (i.e. console), which is equipped with control, measurement, signal and other electrical appliances. The protective switch cabinet is mainly used as the power distribution device in the process site.

(3) Drawer type switch cabinet. This kind of switch cabinet is made of steel plate with a closed shell, and the electrical components in and out of the line circuit are installed in the extractable drawer, forming a functional unit that can complete a certain type of power supply task. The functional unit and bus or cable are separated by grounded metal plate or plastic functional plate to form three areas: bus, functional unit and cable.

There are also isolation measures between each functional unit. Drawer type switch cabinet has high reliability, safety and interchangeability. It is a relatively advanced switch cabinet. At present, most of the switch cabinets produced are drawer type switch cabinets. They are suitable for industrial and mining enterprises and high-rise buildings that require high reliability of power supply, as the distribution center of centralized control.

(4) Power and lighting distribution control box. Most of them are closed vertical installation. Due to different use occasions, the degree of protection of the shell is also different. They are mainly used as power distribution devices in the production site of industrial and mining enterprises.

Guizhou Jinzhong Power Transmission and distribution equipment Co., Ltd., founded in 2010, is located in Guiyang Economic and Technological Development Zone, covering an area of 70 mu. The company is a comprehensive enterprise integrating R & D, production and trade.

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