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What is a distribution box?

Publish Time: 2022-09-05 14:20:15     Author: DELIXI

Purpose Edit broadcast

Distribution box has the characteristics of small size, easy installation, special technical performance, fixed position, unique configuration function, not limited by the site, the application is more common, stable and reliable operation, high space utilization rate, less land and environmental protection effect. It is the control center that commands various components in the power supply line to distribute electric energy reasonably. It is the control link that reliably accepts the upper end power supply and correctly feeds out load electric energy. It is also the key to obtain the user's satisfaction with the quality of power supply. To improve the operation reliability of power distribution box is the goal of creating a high quality project. [2]

The purpose of distribution box: reasonable distribution of electric energy, easy to open and close the circuit operation. High safety protection level, can visually display the circuit on state.

Classified edit broadcast

The commonly used distribution box has two kinds of wooden and metal, because the protection level of metal distribution box is higher, so it is more used in metal.

Classification by structural features and uses:

(1) fixed panel switchgear, often called switch board or distribution panel. It is a kind of open switchgear with panel blocking, the front side has a protective effect, the back and side can still touch the live part, the protection level is low, can only be used for industrial and mining enterprises with low requirements on the continuity and reliability of power supply, for centralized power supply in substation.

(2) Protective (enclosed) switchgear refers to a low-voltage switchgear with all sides enclosed except the mounting surface. The electrical components of the cabinet, such as switch, protection and monitoring control, are installed in a closed enclosure made of steel or insulating materials, which can be installed on or off the wall. No isolation measures can be added between each loop in the cabinet, or grounded metal plates or insulation boards can be used for isolation. Usually the door is mechanically interlocked with the main switch operation. In addition, there are protective table-type switchgear (console), the panel is equipped with control, measurement, signal and other electrical appliances. The protective switchgear is mainly used as the power distribution device in the process site.

(3) drawer type switch cabinet. This kind of switchgear is made of steel plate closed shell, in and out of the circuit electrical components are installed in the drawer can be pulled out, constitute a functional unit can complete a type of power supply task. The function unit is separated from the bus or cable by a grounded metal or plastic function board to form three areas: bus, function unit, and cable. There are also isolation measures between each functional unit. Drawer type switch cabinet has higher reliability, safety and interchangeability, it is more advanced switch cabinet, switch cabinet mostly refers to drawer type switch cabinet. They are suitable for industrial and mining enterprises and high-rise buildings that require high reliability of power supply, and serve as centralized control distribution centers.

(4) Power and lighting distribution control box. Mostly closed vertical installation. Because of the use of different occasions, the shell protection level is different. They are mainly used as distribution devices in the production site of industrial and mining enterprises. [1]


Distribution box structure is divided into two kinds

1, welding structure [3] : simple sheet metal parts after cutting, bending, opening and welding.

2, assembled structure: the sheet metal parts are processed separately, each part is processed in the assembly, with screws and three lock reinforcement, beautiful appearance, simple operation, can save a lot of transportation costs.

Distribution box and distribution cabinet, distribution panel, distribution panel, electrical cabinet, etc., is a complete set of devices for centralized installation of switches, meters and other equipment.

Principle edit broadcast



Distribution box is according to the electrical wiring requirements of switchgear, measuring instruments, protective appliances and auxiliary equipment assembled in a closed or semi-closed metal cabinet or screen, forming a low-voltage distribution box. In normal operation, the circuit can be switched on or off by manual or automatic switch. In case of failure or abnormal operation, cut off the circuit or alarm with the help of protective appliances. By means of measuring instrument, various parameters in operation can be displayed, some electrical parameters can be adjusted, and the deviation from the normal working state can be signaled or sent out

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