MNS Withdrawable Low Voltage Switchgear

Main technical parameters

What Are The Structure Of MNS switchgear？

The cabinet body of MNS low-voltage switchgear is clearly divided into several independent compartments, this can ensure fault isolation and operational safety:

Cabinet Frame: The basic structure of the MNS switchgear cabinet is composed of C-shaped profiles assembled together.C-shaped profiles are made by bending steel plates with E=25mm as the modular installation hole. All cabinet racks and inner partitions are treated with galvanized purification. The surrounding door panels and side panels are coated with high-voltage electrostatic spraying. This cabinet frame has the features of high strength and flexibility.

Functional Compartments:

1. Horizontal Busbar Compartment: Located at the rear of the cabinet, it is the main channel for power collection and distribution.

2. Functional Unit Compartment: Located at the front of the cabinet, it houses drawer units, each being an independent functional module.

3. Cable Compartment: Located at the front right or lower part of the cabinet, used for connecting incoming and outgoing cables.

Product characteristics and advantages:

1. Modularity and Flexibility: Drawer unit heights of the MNS Withdrawable Low Voltage Switchgear are based on modular dimensions (e.g., 8E/4, 8E/2, 8E, 16E, 24E), can be flexible configuration. A single cabinet can accommodate up to 36 circuits (single‑sided operation).

2. Three‑Position Drawer Design: Each drawer has three positions: "Connected", "Test", and "Disconnected".

Connected: Main and auxiliary circuits are both connected; equipment operates normally.

Test: Main circuit disconnected, only auxiliary circuit connected – allows control circuit testing without de‑energizing the main circuit.

Disconnected: Both main and auxiliary circuits are disconnected; the drawer can be fully withdrawn for maintenance or replacement.

3. High Safety and Reliability:

Mechanical Interlock: The drawer operating handle of the MNS switchgear interlocks with the internal circuit breaker, ensuring the drawer can only be moved when the breaker is open, this can prevent operation under load.

4. Physical Isolation: The switchgear compartments are separated by steel plates or high‑strength flame‑retardant plastic barriers, which can effectively limit fault propagation.

Robust Busbar System: The horizontal busbar of the MNS switchgear is specially designed to withstand short‑circuit currents up to 100kA/1s, with excellent dynamic and thermal stability.

Intelligent Capability: This switchgear can integrate smart meters and communication modules (e.g., Modbus, Profibus) for remote monitoring, parameter measurement (current, voltage, power factor, etc.), and fault early warning.

5. Easy Installation and Maintenance: The MNs switchgear drawers run on roller guides for low withdrawal resistance, operable by a single person. The cable compartment provides ample space and supports front or rear connection, facilitating maintenance.

Selection and Usage Considerations

1. Technical Parameter Matching: Determine the rated current based on total load power and diversity factor; select switching devices with adequate breaking capacity according to the grid’s short‑circuit capacity.

2. Function and Circuit Configuration: Clarify whether the application is a power centre (PC) or motor control centre (MCC), and select the appropriate drawer type and size.

3. Environmental Adaptability: Choose the appropriate protection rating (e.g., IP30, IP40, IP54) based on the installation environment (e.g., clean dry electrical room vs. damp dusty industrial workshop).

4. Drawer Unit Configuration:

1/4 unit: For small‑capacity, high‑density circuits such as lighting and small power equipment.

1/2 unit: Suitable for medium‑capacity circuits, e.g., fan and pump control.

1 unit and above: Used for high‑power equipment or main circuits such as incoming and bus‑tie.

Installation and Maintenance Points

1. Installation Environment: The MNS Withdrawable Low Voltage Switchgear should be installed indoors without explosive, corrosive gases or dust. The foundation must be level, with channel steel level error controlled within 1/1000.

2. Installation Procedure: Follow the steps: "Preparation → Positioning → Connection → Commissioning".After main busbar are connected, need insulation resistance tests and other checks to ensure correctness before energizing.

3. Operation and Maintenance: All operation and maintenance work must be carried out by trained professional electrical operater. In daily maintenance, it is necessary to regularly check whether the drawer plug contact area is overheated, check whether the mechanical interlocking device is working properly, and clean the dust accumulation inside the panel.

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