I. Definition

A distribution cabinet (also known as a distribution box or panel) is a complete set of distribution equipment in the power system where switches, protection devices, and instruments are centrally installed; it is the terminal equipment of the distribution system. Core functions: distributing electric energy, controlling on/off, protectng circuits, and monitoring status.

II. Core Functions

- Distribution: Distributes upstream electric energy to various power circuits/devices

- Control: Manual/automatic start/stop, switchig circuits

- Protection: Automatically cuts off power during overload, short circuit, leakage, or overvoltage

- Monitoring: Displays voltage, current, power, and electricity consumption

- tenance: Narrows down fault scope, facilitates maintenance

III. Main Classification (By Voltage)

1. High Voltage Distribution Cabinet (≥1kV)

- Vltage: 6kV, 10kV, 35kV

- Application: Substations, power plants, large factories

- Types: Fixed type, Draw-out type (witdrawable)

2. Low Voltage Distribution Cabinet (≤1kV)

- Voltage: 220V/380V

- Application: Most widely used in industrommerce, and residential areas

- Types:

- GGD: Fixed type, economical and general-purpose

- GCS/GCK/MNS: Drawer type, convenient maintenance, high relability

IV. Classification by Function/Purpose

- Infeed Cabinet: Receives the main power supply

- Outfeed Cabinet: Distributes power to various loads

- Metering Cabinctric energy metering and billing

- Capacitor Compensation Cabinet: Improves power factor, energy saving

- Power Cabinet: Controls motors and equipment

- Lighting Cabinet: Power distribution ing circuits

- Explosion-proof/Corrosion-resistant/Outdoor Cabinet: For use in special environments

V. Basic Composition

- Cabinet Body: Metal enclosed/semi-enlosed shell

- Primary Circuit: Circuit breakers, contactors, busbars, cables

- Secondary Circuit: Instruments, indicator lights, buttons, relays

- Protective Eleents: Fuses, thermal relays, leakage protection devices

VI. Application Scenarios

- Industry: Factory workshops, mines, fans, water pumps, production lines

- Construction: Officgs, shopping malls, residences, floor distribution boxes

- Infrastructure: Tunnels, subways, road lighting

- Special: Petrochemical (explosion-proof), offshore platfs (corrosion-resistant)