The low-voltage power distribution cabinet is a core complete set of equipment in the AC low-voltage power distribution system, used for receiving, distributing, controlling, protecting and measuring electrical energy. It is mainly applied in 380V/220V low-voltage power distribution systems, providing safe and reliable power supply for various power equipment, lighting, air conditioners, fans, water pumps and production loads.

I. Product Application
1. Receive low-voltage electrical energy from transformers or higher-level power sources
2. Distribute the electrical energy to multiple circuits for power supply to various electrical loads
3. Implement protection for overload, short circuit, phase loss, and leakage in circuits
4. Control the start and stop of power equipment such as motors, water pumps, and fans
5. Complete electrical energy measurement, reactive power compensation, and power factor adjustment
6. Facilitate system maintenance, repair, and fault isolation

II. Structural Composition
Cabinet Frame: Made of cold-rolled steel plates or profiles through welding / assembly, the structure is sturdy, with a general protection level of IP30 to IP54
Main Bus System: Collects power sources and realizes parallel power supply for each circuit
Switch Components: Molded-case circuit breakers, air switches, disconnectors, contactors, thermal relays, etc.
Protective Components: Fuses, leakage protectors, motor protectors, surge protectors, etc.
Measurement and Instruments: Ammeters, voltmeters, energy meters, multi-functional power meters
Auxiliary Circuits: Indicator lights, buttons, transfer switches, secondary terminal blocks
Compensation Unit: Some cabinets integrate capacitor banks to achieve reactive power compensation

III. Working Principle
During normal operation, the power supply is connected to the bus through the main switch, and then distributed to the loads via each branch switch. When faults such as overload or short circuit occur in the line, the protection switch will automatically trip to cut off the power supply, ensuring the safety of equipment and personnel. At the same time, the control circuit can be used to achieve remote/local control, linkage control and other functions of the motor.

IV. Main Technical Parameters
Rated Voltage: AC 380V/220V, 50Hz
Rated Current: 20A - 6300A
Rated Short-Term Withstand Current: 15kA - 80kA
Protection Grade: IP30, IP40, IP44, IP54, etc.
Connection Method: Top inlet top outlet, top inlet bottom outlet, bottom inlet bottom outlet
Compliance Standards: GB/T 7251, IEC 61439 series

V. Product Features
1. Compact structure, well-organized layout, easy installation and wiring
2. Complete protection functions, safe and reliable operation
3. Flexible configuration, circuits can be freely combined according to load requirements
4. Strong scalability, can add intelligent instruments and communication interfaces to achieve remote monitoring
5. Wide application environment, can be used in indoor, outdoor, explosion-proof and other scenarios

VI. Application Scope
It is widely used in industrial plants, residential areas, shopping malls and hotels, hospitals and schools, data centers, municipal projects, substations, industrial and mining enterprises, and various building power distribution systems. It is the most fundamental and commonly used complete set of equipment in the low-voltage power distribution system.