Power Distribution Box


The distribution box is a low-voltage distribution box composed of switchgear, measuring instruments, protective appliances and auxiliary equipment assembled in closed or semi closed metal cabinets or panels according to the requirements of electrical wiring. During normal operation, the circuit can be connected or disconnected with the help of manual or automatic switch. In case of fault or abnormal operation, cut off the circuit or alarm with the help of protective appliances. The measuring instrument can display various parameters in operation, adjust some electrical parameters, and prompt or send signals for deviation from the normal working state.

The commonly used distribution boxes are made of wood and metal. Because the protection grade of metal distribution boxes is higher, metal distribution boxes are more used.

Classification by structural features and uses:

(1) Fixed panel switchgear is often called switch board or distribution panel. It is an open switch cabinet with a panel barrier. The front side has a 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 power supply continuity and reliability for centralized power supply in the substation.

(2) Protective (i.e. closed) switchgear refers to a low-voltage switchgear in which all sides are closed except the mounting surface. The switch, protection, monitoring and control and other electrical components of this cabinet are installed in a closed shell made of steel or insulating materials, which can be reliably installed on or off the wall. No isolation measures can be taken between each circuit in the cabinet, or grounded metal plate or insulating plate can be used for isolation. Generally, the door is mechanically interlocked with the main switch. In addition, there is a protective desk type switchgear (i.e. console), which is equipped with control, measurement, signal and other electrical appliances. The protective switchgear is mainly used as the power distribution device at the process site.

(3) Drawer type switchgear. This kind of switch cabinet is made of steel plate into a closed shell, and the electrical components of the incoming and outgoing circuit are installed in withdrawable drawers to form a functional unit that can complete a certain kind of power supply task. Between the functional unit and the bus or cable, the functional board made of grounded metal plate or plastic is separated to form three areas of bus, functional unit and cable. Isolation measures are also taken between each functional unit. Drawer type switchgear has high reliability, safety and interchangeability. It is a relatively advanced switchgear. Most of the switchgear refers to drawer type switchgear. They are applicable to industrial and mining enterprises and high-rise buildings that require high reliability of power supply, and serve as centralized control power distribution centers.

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


(1) the construction power distribution system shall be equipped with a general distribution box, a distribution box, and a switch box, which shall be set in a hierarchical manner in the order of "general - off - on", and form a "three-level power distribution" mode.

(2) The installation position of each distribution box and switch box of the power distribution system for construction shall be reasonable. The main distribution box should be as close to the transformer or external power supply as possible to facilitate the introduction of power. The distribution box shall be installed in the center of the relatively concentrated electrical equipment or load as far as possible to ensure that the three-phase load is balanced. The installation position of the switch box shall be as close to the electrical equipment it controls as possible according to the site conditions and working conditions.

(3) Ensure the three-phase load balance of the temporary power distribution system. The power and lighting power at the construction site should form two power circuits, and the power distribution box and lighting distribution box should be set separately.

(4) All electrical equipment on the construction site must have their own special switch boxes.

(5) The boxes and internal settings of distribution boxes at all levels must comply with safety regulations. The switching appliances should be marked with purpose, and the boxes should be numbered uniformly. The power supply of the power distribution box that is out of use shall be cut off and the door of the box shall be locked. The fixed distribution box shall be provided with a fence and rain proof and smash proof measures.

(6) The difference between distribution box and distribution cabinet. According to gb/t20641-2006 General requirements for empty shells of low voltage switchgear and control equipment

Distribution boxes are generally used in families, while distribution cabinets are mostly used in centralized power supply, such as industrial power and building power. Distribution boxes and distribution cabinets belong to complete sets of equipment, distribution boxes belong to complete sets of low-voltage equipment, and distribution cabinets have high voltage and low voltage.

The company's main products are fire emergency power EPS, fire inspection cabinet, fire machinery emergency start cabinet, fire power cabinet, fire pump control cabinet, fire fan box in recent years, GGD series low-voltage complete equipment, GCK, GCS series low-voltage draw out switchgear, XL series power box, XM lighting box, X DJ metering box, GGJ reactive power compensation device, various high-voltage switchgear, XGN series box type fixed high-voltage switchgear /hx GN series ring network cabinet, KYN 28 KYN 61 series armored removable metal enclosed switchgear, YBM series prefabricated substation, zg-12 combined substation, DWF series outdoor cable branch box, power transformer, etc. Automatic PLC DC power supply, power background system. Products are widely used in power, petrochemical, machinery, municipal, environmental protection, waterproof treatment, intelligent building and other industries.
The company actively carries out brand building, regards product quality as its life, and implements standardized, institutionalized and standardized management. The company's strict process management, perfect quality assurance system, efficient management system and high communication service team provide a reliable guarantee for product quality. With innovative technology, leading products and high-quality services, the company will work with colleagues to promote the development of power equipment manufacturing industry. Scientific and technological innovation is our principle of pursuing excellence, and efficient service is our purpose to satisfy customers. We are moving forward full of vitality and look forward to cooperating with you to create a better tomorrow.
Sichuan wanhengda Electrical Equipment Co., Ltd. produces products mainly used in power plants, hydropower stations, substations and power, petroleum, railway, metallurgy, mining, textile, light industry, machinery industry transmission and distribution engineering and real estate fields. The main products are high and low voltage switchgear, box type substation, all kinds of protection panels, control panels (sets), all kinds of power boxes, metering boxes, lighting boxes, computer PLC control devices, DC power system and cable tray, etc. And can design and produce various non-standard products according to user requirements.
The company has many years of production experience and strong technical force, with all kinds of cutting, folding, punching CNC machine tools and other equipment and perfect testing means, high-quality staff, perfect quality assurance system and perfect sales service system, which fully meet customer expectations. With sincere attitude, high-quality products, reasonable prices and considerate service, it has won the praise of the majority of users.
At present, the company has two production sites, No. 118, group 8, Ping'an Village, Tuanjie Town, Pidu District, Chengdu, Sichuan Province, and No. 26-17, Yangheng Fourth Road, Yang'an Industrial Park, Chengdu, Sichuan Province. It has the capacity of large-scale production.
The company always adheres to the tenet of "survival by quality and development by efficiency", the technological innovation concept of "taking the market as the foundation and relying on science and technology", takes scientific and technological progress and product development as the foundation of its business, constantly introduces talents and technology, adjusts the product structure, develops high-tech marketable products, and meets the market demand
We sincerely welcome new and old users to our company for negotiation, visit and guidance, and we will provide timely, warm and thoughtful services to users.


Weikui Zhao


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