MNS low-voltage withdrawable switchgear

The MNS low-voltage withdrawable switchgear is a modular cabinet type assembled in the factory (FBA) using standard modules. This series is designed for use in power plants, substations, petrochemical, metallurgy, transportation energy, light industry and textile enterprises, as well as residential areas and high-rise buildings. It serves as a distribution device for power conversion, distribution, and control in electrical systems operating at an AC frequency of 50-60Hz and a rated voltage of 660V and below.

Key Features:

The MNS low-voltage withdrawable switchgear can be divided into two types

Power Center Cabinet (PC)

The Power Center Cabinet adopts a fixed-mounted withdrawable switch design, with current ratings ranging from 630A to 6300A, and is equipped with advanced-structure, intelligent circuit breakers featuring high breaking capacity.

Motor Control Center Cabinet (MCC)

Drawer Type

Composed of drawers of different sizes.

The main switch of each circuit adopts either a high-breaking-capacity molded case circuit breaker or a rotary load switch with fuse.

Fixed Type

The functional units of the MCC cabinet adopt fixed installation with plug-in molded case circuit breakers.

This design provides a clearly visible isolation point, enhances safety, and at the same time offers the high reliability of a fixed-type cabinet.

The functional units are separated by steel plates and are independent of each other.

The unit structure is compact, with large capacity and strong functionality.

Different types of functional units can be assembled individually within one cabinet or combined in a mixed arrangement.

The effective height is 72E, allowing flexible configuration according to different design schemes.

Why choose MNS low-voltage withdrawable switchgear

Modular and Flexible Design: Built on a standardized modular structure, the MNS cabinet can be configured with drawer units, fixed units, or mixed functional arrangements to match different power distribution and motor control requirements.
Space-Saving Cabinet Layout: Its compact design allows more functional units to be integrated into a limited installation space, making it ideal for projects that require efficient use of electrical rooms.
High Operational Safety: The cabinet uses flame-retardant engineering plastic components and separated functional units to improve protection performance, reduce operational risk, and support safer maintenance.
Convenient Maintenance and Expansion: Withdrawable drawer units make inspection, replacement, and future expansion easier, helping reduce maintenance time and improve service efficiency.
Wide Application Range: With rated voltage up to 690V AC, main busbar current up to 6300A, and protection levels from IP30 to IP54, the MNS switchgear is suitable for industrial plants, substations, commercial buildings, and infrastructure projects.
Standards-Compliant Performance: The system complies with IEC 61439 and GB/T 7251.1/12, providing reliable technical performance for modern low-voltage power distribution systems.

Product Advantages

Compact Design: A greater number of functional units can be accommodated within a relatively small space.

Highly Versatile Structure and Flexible Assembly: The 25 mm modular C-profile can meet the requirements of various structural forms, protection grades, and service environments.

Standard Modular Design: Standard units for protection, operation, switching, control, adjustment, measurement, and indication can be assembled separately. Users may freely select and combine them according to actual needs. With more than 200 assembly components, different cabinet frame structures, fixed partition units, or drawer units can be configured into various solutions.

High Safety: A large number of high-strength, flame-retardant engineering plastic components are used to effectively improve protection and operational safety.

Advanced Technical Performance: The main technical parameters have reached the contemporary international advanced level.

Space Saving: The high degree of standardization, serialization, and modularization greatly reduces the space required for storage and transportation of prefabricated parts.

Easy Assembly: No special or complicated tools are required for installation and assembly.

Operating Conditions

Ambient Air: The ambient air temperature shall not exceed +40°C and shall not be lower than -5°C, and the average temperature within 24 hours shall not exceed +35°C.

Atmospheric Conditions: The air shall be clean. Relative humidity shall not exceed 50% at a maximum temperature of +40°C. At lower temperatures, higher relative humidity is permissible, for example, 90% at +20°C. However, temperature changes may occasionally cause condensation.

Altitude: The installation altitude shall not exceed 2000 m above sea level.

Special Conditions: If the above service conditions cannot be met, the user and the manufacturer shall negotiate a solution separately.

Special Applications: When this equipment is used on offshore oil drilling and production platforms or in nuclear power plants, a separate technical agreement shall be signed.

Application

The MNS low-voltage switch cabinet is mainly used in industrial and mining enterprises, buildings, power plants, and various engineering projects. It serves as the core equipment for power distribution, motor control, and power allocation in the 50/60Hz AC low-voltage system.

Model meaning

Technical Parameters

Overall and mounting dimensions(mm)（Reference）

Model meaning

MNS low-voltage withdrawable switchgear	M:	Modular structure
	N:	Low-voltage
	S:	Switchgear

Technical Parameters

The MNS low-voltage withdrawable switchgear is designed for 400V/690V AC low-voltage distribution systems and supports main busbar ratings from 630A to 6300A. It provides flexible drawer and fixed unit configurations, protection levels from IP30 to IP54, and compliance with IEC 61439 and GB/T 7251.1/12, making it suitable for power distribution, motor control, and low-voltage power management in industrial and commercial projects.

Category	Parameter	Standard Range / Specification	Remarks
Electrical System	Rated Operational Voltage (Ue)	400V / 690V AC	Compatible with mainstream low-voltage systems
	Rated Insulation Voltage (Ui)	≤1000V AC	Ensures sufficient insulation margin
	Rated Impulse Withstand Voltage (Uimp)	8kV	Overvoltage Category III
	Rated Frequency	50/60Hz	Suitable for global applications
Main Busbar	Rated Current	630A–6300A	Maximum value for horizontal busbar
	Rated Short-Time Withstand Current (Icw)	50 / 80 / 100kA (1s)	Thermal and dynamic stability capability
	Rated Peak Withstand Current (Ipk)	105 / 176 / 220kA	Withstands short-circuit impact current
Distribution / Branch Busbar	Rated Current	400A–1600A	For vertical / branch circuits
	Rated Short-Time Withstand Current (Icw)	30kA–80kA (1s)	Suitable for branch circuit capacity
	Rated Peak Withstand Current (Ipk)	63kA–143kA	Branch circuit impact withstand capability
Structure & Protection	Cabinet Height	2200mm	Standard height
	Cabinet Width	400 / 600 / 800 / 1000 / 1200mm	Modular combination
	Cabinet Depth	800 / 1000mm	Can be arranged in back-to-back installation
	Degree of Protection (IP)	IP30–IP54	Standard IP40, customizable
	Drawer Unit Specification	8E/4, 8E/2, 8E, 16E, 24E	Up to 36 circuits per cabinet
	Mechanical Life of Drawer Unit	≥2000 operations	Reliable plug-in and withdrawal performance
Environment & Standards	Ambient Temperature	-5°C to +40°C	24-hour average ≤35°C
	Relative Humidity	≤50% (at 40°C)	Short-term condensation allowed
	Altitude	≤2000m	Customizable for higher altitude
	Standards	IEC 61439, GB/T 7251.1/12	Complies with both international and domestic standards

Overall and mounting dimensions(mm)（Reference）

Custom MNS Switchgear Solutions for Your Project

(The values can be customized according to local project requirements.)

If you have specific requirements for the parameters, structure, or configuration of the MNS low-voltage withdrawable switchgear, please contact us. Our team of account managers, technical engineers, and product consultants will evaluate your application scenario, electrical parameters, protection requirements, installation conditions, and project schedule to develop a suitable solution.

We can help customize rated voltage, current range, cabinet layout, drawer or fixed functional units, protection level, and other design details to match your distribution system and operating environment.

FAQ

What are the basic unit types that make up the MNS low-voltage cabinet?

Drawer Type

There are five standard drawer sizes, all based on the height module of 8E (200 mm):

●
8E/4: 4 drawer units can be assembled within an 8E height space.
●
8E/2: 2 drawer units can be assembled within an 8E height space.
●
8E: 1 drawer unit can be assembled within an 8E height space.
●
16E: 1 drawer unit can be assembled within a 16E (400 mm) height space.
●
24E: 1 drawer unit can be assembled within a 24E (600 mm) height space.

These five drawer unit types can be assembled individually in one cabinet or combined in a mixed arrangement.

Fixed Type

The standard unit sizes are also based on the height module of 8E (200 mm):

●
8E: 1 unit can be assembled within an 8E height space.
●
16E: 1 unit can be assembled within a 16E (400 mm) height space.
●
24E: 1 unit can be assembled within a 24E (600 mm) height space.
●
8E/2: 2 units can be assembled within an 8E height space.
●
8E/4: 4 units can be assembled within an 8E height space.

Each unit can be assembled individually in one cabinet or in a mixed arrangement.

What are the main applications of MNS switchgear?

MNS switchgear is commonly used for power distribution, motor control, reactive power compensation, and centralized low-voltage control in industries such as power generation, petrochemical, metallurgy, transportation, manufacturing, and building infrastructure.

What is the difference between withdrawable and fixed low-voltage switchgear?

Withdrawable switchgear uses drawer-type functional units that can be quickly removed for maintenance or replacement, reducing downtime. Fixed switchgear uses permanently installed units and is often chosen for simpler distribution tasks or lower-cost projects.

What is the rated voltage of MNS low-voltage withdrawable switchgear?

The standard rated operational voltage of MNS low-voltage withdrawable switchgear is typically 400V or 690V AC, with a rated insulation voltage up to 1000V AC.

What is the rated current range of the MNS main busbar?

The main busbar rated current of MNS switchgear generally ranges from 630A to 6300A, depending on the project design and cabinet configuration.

What standards does the MNS switchgear comply with?

MNS low-voltage withdrawable switchgear is commonly designed to comply with IEC 61439 and GB/T 7251.1/12, helping ensure safety, performance, and reliability for low-voltage switchgear assemblies.

What protection level can the MNS cabinet provide?

The cabinet protection degree typically ranges from IP30 to IP54. IP40 is often used as a standard option, while higher protection levels can be customized based on installation conditions.

How does the withdrawable drawer design improve maintenance efficiency?

The withdrawable drawer structure allows operators to inspect, replace, or service functional units more quickly than fixed-mounted systems. This helps reduce maintenance time and improves operational continuity.

Is MNS switchgear suitable for motor control center applications?

Yes. MNS switchgear is widely used in MCC systems because its modular structure supports flexible motor feeder arrangements, easy maintenance, and safe separation between functional units.

Can MNS low-voltage switchgear be customized for different projects?

Yes. MNS switchgear can be customized based on project requirements such as rated current, cabinet dimensions, protection degree, circuit arrangement, application environment, and special installation conditions.

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Nearly 20 Years of Industry Experience

10,000⁺ Units/Year Production Capacity

40,000^m²+ Factory Area

500⁺ Power Utility Clients

1 Billion⁺ CNY Annual Sales Revenue