Cabinet:

Framework: It is the supporting structure of the distribution cabinet, usually made of metal materials such as steel, with sufficient strength and rigidity to withstand the weight of internal electrical components and possible external forces, ensuring the stability of the cabinet.

Shell: It plays a role in protecting internal electrical components, preventing dust, moisture, foreign objects, etc. from entering the cabinet, and avoiding damage to electrical components. The material of the shell is generally metal and requires good protective performance. Some distribution cabinets used in special environments may also need to have explosion-proof, anti-corrosion and other characteristics.

Busbar system:

Main busbar: It is the main conductor used to transmit electrical energy in the distribution cabinet, responsible for distributing the electrical energy from the incoming power supply to various branch circuits. The main busbar has a large current carrying capacity and can withstand high current loads. Its cross-sectional shape and size are designed and selected based on parameters such as the rated current and short-circuit current of the distribution cabinet.

Branch busbar: connects the main busbar and various electrical components, transmitting electrical energy from the main busbar to specific electrical equipment or circuits. The specifications of the branch busbar are relatively small compared to the main busbar, and are configured according to the power and current requirements of the connected electrical components.

Electrical components:

Circuit breaker: It is an important protective component of the distribution cabinet, which can automatically cut off the circuit in case of overload, short circuit, undervoltage and other faults, protecting the safety of equipment and lines. Common circuit breakers include air switches, residual current switches, and dual power automatic transfer switches. Air switches are mainly used for normal on-off control and overload protection; Leakage switch can quickly cut off the circuit in case of leakage fault, ensuring personal safety; The dual power automatic transfer switch can automatically switch to the backup power supply in case of a main power failure, ensuring the continuity of power supply.

Contactor: Used to control the on/off of circuits, usually used for loads such as motors that frequently start and stop. Contactors control circuits by closing or opening contacts through the action of electromagnetic force. It has a certain overload capacity and a long service life, which can adapt to the requirements of industrial production and other occasions.

Relay: An electrical component that controls the on/off of an output circuit based on changes in input signals such as voltage, current, temperature, etc. In distribution cabinets, relays are commonly used for signal conversion, amplification, control, and other functions, such as protecting circuits, automatic control, remote control, etc.

Fuse: When the current in the circuit is too high, the fuse melts, cutting off the circuit and providing short-circuit protection. The advantages of fuses are simple structure, low cost, and high reliability, but they are disposable protective components that require replacement of the fuse after melting.

Current transformers and voltage transformers: Current transformers are used to convert large currents into small currents for measuring and protecting circuits; Voltage transformers convert high voltage into low voltage for measurement, protection, and control purposes. They can isolate measuring instruments and protective devices from high voltage and high current circuits, improving measurement accuracy and safety.

Capacitors: Capacitors are installed in some distribution cabinets that require improvement in power factor. Capacitors can store charges, play a role in reactive power compensation in circuits, improve the power factor of the power grid, reduce energy loss, and enhance the efficiency of energy utilization.

Intelligent measurement and control protection device: With the development of technology, more and more distribution cabinets are equipped with intelligent measurement and control protection devices, such as microcomputer protection devices, multifunctional power instruments, etc. These devices can monitor the operating parameters of the circuit in real time (such as voltage, current, power, electrical energy, etc.), and issue alarm signals or take protective measures in a timely manner when abnormal situations occur. They also have functions such as data communication and remote monitoring, making it convenient for users to manage and control the operating status of the distribution cabinet.

Wiring section:

Terminal block: It is a component used to connect wires between electrical components, providing reliable electrical connections. There are various types of terminal blocks, including plug-in and screw fixed types. Choose the appropriate terminal block based on the specifications and connection method of the wire.

Wire: Used to transmit electrical energy and signals between electrical components. The selection of wire should be based on factors such as circuit current, voltage, and ambient temperature to ensure that the current carrying capacity and insulation performance of the wire meet the requirements. Inside the distribution cabinet, the arrangement of wires should be neat and standardized, avoiding crossing, winding, and other situations for easy maintenance and repair.

Control and indication section:

Control button: Used for manually controlling the on/off, start, and stop operations of the circuit, making it convenient for operators to control the distribution cabinet. Control buttons are usually installed on the panel of the distribution cabinet for easy operation.

Indicator lights: used to display the operating status of circuits, such as power indicator lights, operation indicator lights, fault indicator lights, etc. By observing the status of the indicator lights, operators can intuitively understand the working condition of the distribution cabinet and promptly detect any abnormalities.

Other attachments:

Guide rail: used for installing and fixing electrical components, facilitating the installation and disassembly of electrical components, while also ensuring the accurate and stable installation position of electrical components.

Door lock: In order to ensure the safety of the distribution cabinet and prevent unauthorized personnel from opening it, door locks are usually equipped. The type and safety of door locks are selected based on the usage environment and requirements of the distribution cabinet.