Product Overview
The MNS low-voltage withdrawable switchgear is a modular, factory-assembled, metal-enclosed power distribution equipment designed for rated voltages up to 690V and rated frequencies of 50Hz or 60Hz. It is widely used in power distribution and motor control applications in power plants, substations, industrial facilities, commercial buildings, and infrastructure projects.
The product complies with GB 7251, IEC 61439, and relevant international standards, featuring a flexible, fully modular construction with standardized functional units. The withdrawable design enables convenient maintenance, inspection, and replacement without interrupting system operation. The MNS series offers high reliability, safety, and adaptability, making it an ideal solution for modern low-voltage power distribution systems.

Key Features
Modular and Flexible Construction
The cabinet frame is assembled from C-shaped steel sections with E=25mm modular holes, allowing flexible combination of functional units. The modular design enables easy reconfiguration and future expansion. Standardized components ensure interchangeability and simplified maintenance.
Withdrawable Functional Units
The switchgear features withdrawable drawer units with three distinct positions including connection position, test position, and isolation position. Each position is mechanically interlocked with the main switch, and a padlock can be applied on the operating handle to prevent operational errors.
Compact and Space-Saving Design
The compact design accommodates more functional units in a smaller footprint. Single cabinets can accommodate up to 36 drawer units, with an effective installation space of 72E, where E equals 25mm modular increments.
High Safety and Reliability
The cabinet is divided into four separate compartments including the main busbar compartment, drawer compartment, cable compartment, and auxiliary compartment. Compartments are separated by steel plates or high-strength flame-retardant functional barriers to prevent fault propagation.
Versatile Functional Unit Options
The switchgear supports multiple functional unit types including 8E/4, 8E/2, 8E, 16E, and 24E drawer units. Various functional unit configurations including feeder units, motor control units, and variable speed drive units can be mixed within the same cabinet.
Advanced Busbar System
The main and branch busbars are made of high-conductivity electrolytic copper with silver-plated connections for low contact resistance. The busbar system is protected by high-strength flame-retardant plastic functional barriers for enhanced arc fault protection.
Intelligent Monitoring and Communication
Optional smart monitoring systems with integrated digital meters, protection relays, and communication modules are available. Standard communication protocols including Modbus, Profibus, and IEC 61850 enable seamless integration with SCADA and building automation systems.
High Environmental Adaptability
The enclosure is available with protection ratings from IP30 to IP54, suitable for various indoor environments. The cabinet design has been verified through rigorous testing including seismic testing at intensity 9, arc fault testing at 100kA per 0.5 seconds, salt spray testing for 96 hours, and high-altitude testing up to 4000 meters.

Technical Specifications
Rated Voltage: 400V, 690V
Rated Insulation Voltage: 690V, 1000V
Rated Frequency: 50Hz or 60Hz
Rated Current (Main Busbar): Up to 6300A
Rated Current (Vertical Busbar): Up to 3200A
Rated Short-Time Withstand Current: 30kA, 50kA, 65kA, 80kA, 100kA (1s)
Rated Peak Withstand Current: 63kA, 105kA, 143kA, 176kA, 220kA
Protection Rating: IP30, IP31, IP40, IP42, IP54 (customizable)
Enclosure Material: High-strength steel plate or zinc-coated aluminum-zinc steel
Cabinet Dimensions: 600mm, 800mm, 1000mm (width) x 1000mm, 1200mm (depth) x 2200mm (height)
Functional Unit Types: 8E/4, 8E/2, 8E, 16E, 24E drawer units
Maximum Drawer Units per Cabinet: 36 units for single side, 72 units for double side
Connection Method: Withdrawable, plug-in, or fixed
Cable Entry/Exit: Top, bottom, or side (customizable)
Operating Temperature: -5°C to +40°C
Altitude: Up to 4000m above sea level

Applications
The MNS switchgear is extensively used in power plants and substations for low-voltage power distribution and motor control. Industrial facilities including manufacturing plants, mining operations, petrochemical plants, and metallurgical facilities rely on this switchgear for reliable power distribution. Commercial and high-rise buildings benefit from its compact design and flexible configuration. Infrastructure projects such as airports, railway stations, and ports utilize MNS switchgear for reliable low-voltage power distribution. Renewable energy applications including photovoltaic plants and wind farms employ this switchgear for auxiliary power distribution and control. Municipal projects, hospitals, and data centers also rely on MNS switchgear for high-reliability power distribution systems.

Compliance Standards
GB 7251 Low-Voltage Switchgear and Controlgear Assemblies, IEC 61439-1 Low-Voltage Switchgear and Controlgear Assemblies Part 1: General Rules, IEC 61439-2 Low-Voltage Switchgear and Controlgear Assemblies Part 2: Power Switchgear and Controlgear Assemblies, IEC TR 61641 Arc Fault Testing, GB/T 20641 General Requirements for Low-Voltage Switchgear Enclosures, and JB/T 9661 Technical Specifications for Low-Voltage Withdrawable Switchgear.

Why Choose Us
Our MNS switchgear features modular construction with flexible configuration options to meet diverse application requirements. The withdrawable design simplifies maintenance and reduces system downtime. We perform comprehensive quality control including mechanical and electrical verification, dielectric withstand tests, and protection relay calibration before delivery. Customization options are available for busbar configuration, functional unit selection, and protection schemes to meet specific project requirements. Our engineering team provides professional technical support for system design, installation, and commissioning. Competitive pricing and efficient manufacturing processes ensure value for money. Comprehensive after-sales service includes installation guidance, commissioning assistance, spare parts supply, and technical support. Our switchgear products have been installed in numerous projects worldwide with proven reliability and customer satisfaction.