Structural and Performance Characteristics of GCS Low-voltage Switchgear Cabinet

   The GCS low-voltage draw-out switchgear cabinet is a high-performance, modular low-voltage power distribution

 device, which is widely used in scenarios such as power plants, petrochemical industries, and high-rise buildings 

that require high reliability and automated control. The following details are presented from two aspects: **

structural characteristics** and **performance characteristics**:

### I. Structural Characteristics

#### 1. Cabinet Body and Frame

- **Material and Process**: The main frame is made of **8MF steel**, formed by assembly or partial welding, 

with anti-corrosion treatment on the surface, featuring high strength and good rigidity.

- **Modular Design**: The cabinet body is equipped with **modular holes E = 20mm**, supporting the flexible

 installation of various electrical components to meet different functional requirements.

- **Protection Level**: Optional **IP30 or IP40**, which is dust-proof and splash-proof, adapting to different

 environmental conditions.

#### 2. Compartment Division

- **Functional Unit Chamber**: Installs components such as draw-out circuit breakers and contactors. The 

drawer height is **160mm**, divided into five specifications: **1/2 unit, 1 unit, 1.5 units, 2 units, and 3 units**,

 supporting hot swapping and interchangeability.

- **Busbar Chamber**:

  - **Horizontal Busbar**: Arranged horizontally at the back of the cabinet, with a rated current ≤ 4000A, 

and strong dynamic and thermal stability (short-time withstand current 50/80kA, peak value 105/176kA).

  - **Vertical Busbar**: Located inside the flame-retardant plastic functional board, with a rated current of 

1000A, ensuring high safety.

- **Cable Chamber**: An independent space, supporting **top and bottom cable outlets**, equipped with 

a zero-sequence current transformer, facilitating cable installation and maintenance. The width can be 

selected as 240mm or 440mm.

#### 3. Drawer Design

- **Drawer Types**: Supports **from 1/2 unit to 3 units**. A single MCC cabinet can hold up to **22 1/2-unit 

drawers** or **11 1-unit drawers**.

- **Mechanical Interlock**: The drawer is equipped with a four-position mechanical interlock of **open, close, 

test, and withdraw** to prevent misoperation.

- **Connectors**: Adopts blade-type or rod-type connectors, with clear current grading. Drawers of 1 unit and

 above are equipped with **32 pairs of secondary connectors**, supporting multi-signal transmission.

### II. Performance Characteristics

#### 1. High Reliability and Safety

- **Fault Isolation**: Each compartment is independently sealed. A single-unit fault will not affect other circuits.

The busbar chamber and the cable chamber are isolated by a metal plate to prevent the spread of arcs.

- **Short-circuit Withstand**: The horizontal arrangement design of the busbar improves dynamic and thermal

 stability, and it can withstand the impact of **80kA short-circuit current**, making it suitable for large-capacity

 power distribution systems.

#### 2. Flexible Expandability

- **Modular Combination**: The drawer units can be mixedly configured (a combination of draw-out and fixed types),

 supporting three-phase four-wire or five-wire systems, and adapting to different power distribution schemes.

- **Automation Adaptability**: A large number of secondary connectors (20 pairs for 1/2 unit) support direct

 interfacing with computer systems, meeting the requirements of remote monitoring and automated control.

#### 3. Environmental Adaptability

- **Operating Conditions**:

  - Temperature: -5°C ~ +40°C (average within 24 hours ≤ +35°C), and capacity derating is required for high 

altitudes (≤ 2000m).

  - Humidity: When the temperature is 40°C, the humidity ≤ 50%, and higher humidity is allowed at low 

temperatures (without condensation).

- **Scene Adaptability**: Suitable for complex environments such as power plants, petrochemical industries, 

and data centers, and can be directly connected to dry-type or oil-immersed transformers.

#### 4. Convenient Maintenance

- **Drawer Interchangeability**: Drawers of the same specification can be quickly replaced, reducing the 

power outage time.

- **Cable Chamber Design**: The independent space is convenient for cable maintenance. The zero-sequence 

current transformer is built-in, eliminating the need to disassemble the main circuit.

### III. Comparison with Other Models (Briefly)

- **GCS vs GCK**:

  - GCS has more drawer positions (four positions), stronger interchangeability, and higher busbar safety, 

making it suitable for highly automated scenarios.

  - GCK has a lower cost and fewer circuits, making it suitable for scenarios with simple functional 

requirements.

- **GCS vs MNS**:

  - The module of MNS is 25mm, the drawer height is 200mm, and it has more circuits (36 circuits), 

but GCS has a more compact structure and higher cost-effectiveness.

### Conclusion

The GCS switchgear cabinet takes **modular structure**, **high short-circuit withstand capacity**, 

and **automation adaptability** as its core advantages. It is an ideal choice that balances reliability and

 flexibility in the low-voltage power distribution system, especially suitable for industrial and civil scenarios

 with high requirements for power supply stability and intelligence.