Mns Low Voltage Switchgear-Distribution Cabinets
06-12 2025 | By:
MNS power distribution cabinet
Equipment used in various low-voltage power distribution systems such as power plants, substations, industrial and mining enterprises, buildings, hotels, municipal construction, etc.
MNS power distribution cabinet, MNS type low-voltage withdrawable complete switchgear (hereinafter referred to as switchgear) is an advanced low-voltage switchgear designed and improved with reference to the foreign MNS series low-voltage switchgear to meet the needs of the development of the power industry. This product complies with the national standards GB7251, VDE660 and ZBK36001-89 “Low-voltage withdrawable complete switchgear” and the international standard IEC439. MNS type low-voltage switchgear meets the needs of various power supply and distribution, and can be widely used in various low-voltage power distribution systems such as power plants, substations, industrial and mining enterprises, buildings, hotels, municipal construction, etc.
This series of products has the characteristics of mechanical modular combination and electrical modular combination, and is widely used in many fields such as power, chemical industry, industry, etc., and is favored for its reliability, flexibility and safety. MNS low-voltage withdrawable switchgear is suitable for AC 50~60Hz, rated working voltage 380V (660V), maximum rated working current up to 6300A, suitable for low-voltage systems in high-reliability occasions.
Mns Low Voltage Switchgear-Distribution Cabinets
Conditions of use
The ambient air temperature is not higher than +40℃, not lower than -5℃, and its average temperature within 24h is not higher than +35℃.
In atmospheric conditions, the air is clean, the relative humidity does not exceed 50% at the highest temperature of +40℃, and a higher relative humidity is allowed at lower temperatures, such as 90% at +20℃, but considering that due to temperature changes, moderate condensation will occasionally occur.
The altitude shall not exceed 2000m.
This device is suitable for transportation and storage processes at the following temperatures: between -25℃ and 55℃, and can reach +70℃ in a short time (not more than 24h). Under these extreme temperatures, the device should avoid any irreversible damage and should be able to work normally under normal conditions.
If the above conditions of use cannot be met, the user and the manufacturer should negotiate to resolve.
When this device is used in offshore oil drilling platforms and nuclear power plants, a technical agreement should be signed separately.
Mns Low Voltage Switchgear-Distribution Cabinets
Technical parameters
1 Power distribution center (hereinafter referred to as PC)
The PC cabinet is divided into four compartments:
Horizontal busbar compartment: at the rear of the cabinet; Functional unit compartment: at the upper front of the cabinet or the left front of the cabinet;
Cable compartment: at the lower front of the cabinet or the right front of the cabinet; Control circuit compartment: at the upper front of the cabinet;
Separation measures: Melamine phenolic flat core board or steel plate is used to separate the horizontal busbar compartment from the functional unit compartment and cable compartment.
The control circuit compartment and the functional unit compartment are separated by a flame-retardant polyurethane foam plastic molded cover.
The functional unit compartment on the left and the cable compartment on the right are separated by a steel plate.
2 Drawable electric control center and small current power distribution center (hereinafter referred to as drawable MCC)
The drawable MCC cabinet is divided into three compartments, namely the horizontal busbar compartment at the rear of the cabinet, the functional unit compartment on the left side of the front of the cabinet, and the cable compartment on the right side of the front of the cabinet. The horizontal busbar compartment and the functional unit compartment are separated by a functional board made of flame-retardant foam plastic, and the cable compartment is separated from the horizontal busbar compartment and the functional unit compartment by a steel plate.
3 Portable motor control center and small current power distribution center (hereinafter referred to as portable MCC)
3.1 The frame structure features of the portable MCC are the same as 2.1 and 2.2.
3.2 The functional unit is designed as a portable structure. The connection between the functional unit and the vertical busbar adopts a primary isolation contact. Even if the circuit connected to it is energized, the functional unit can be completely taken out and put back from the equipment. The other end is a fixed structure.
3.3 The functional units of the portable MCC are divided into 8E/4, 8E/2, 8E, 16E, 24E, 32E and 40E. The total height of the functional unit compartment is also 72E.
4 Busbar system
4.1 The horizontal busbar is installed in an independent busbar compartment behind the cabinet. It has two optional installation positions, namely one-third or two-thirds of the cabinet height. The busbar can be installed at the top or bottom as needed, or it can be installed at the same time in two groups. The two groups of busbars can be used alone or in parallel. Each phase busbar consists of 2 or 8 busbars in parallel. The busbar cross-sections are 10×32×2, 10×60×2, 10×80×2, 10×60×4, 10×80×2×2 and 10×60×4×2.
4.2 Vertical busbar
The vertical busbar is an “L” type copper busbar of 50×30×5, which is embedded in a functional board made of flame-retardant plastic. The protection of live parts reaches IP20.
4.3 Neutral busbar (N line) and neutral protection busbar (PE line or PEN line) The neutral busbar and the neutral protection busbar are installed in parallel at the bottom of the functional unit compartment and vertically in the cable room. If the N line and the PE line are separated by an insulator, the N line and the PE line are used separately. If the two are connected by a conductor, a PEN line is formed.
Mns Low Voltage Switchgear-Distribution Cabinets
Structural features
1. The frame of the MNS type low-voltage switchgear is a modular structure, and the basic skeleton is assembled from C-shaped steel. All structural parts of the cabinet frame are galvanized and firmly connected to form a basic cabinet frame through self-tapping locking screws or 8.8-grade hexagonal bolts, and are assembled into a complete switchgear with doors, partitions, mounting brackets, busbar functional units and other components corresponding to the scheme changes. The internal dimensions, component dimensions, and compartment dimensions of the switchgear are all changed according to the modularization (E=25mm).
2. Each cabinet of the MNS type modular low-voltage switchgear is divided into three chambers, namely the horizontal busbar chamber (at the rear of the cabinet), the drawer chamber (at the front of the cabinet), and the cable chamber (at the bottom of the cabinet or on the right side of the front of the cabinet). The chambers are separated from each other by steel plates or high-strength flame-retardant plastic functional panels, and the upper and lower drawers are separated by metal plates with ventilation holes to effectively prevent arcing caused by faults in the switch components or accidents caused by short circuits between the busbar and other lines.
3. The structural design of the MNS low-voltage switchgear can meet the requirements of various inlet and outlet schemes: top in and top out, top in and bottom out, bottom in and top out, bottom in and bottom out.
4. Compact design: accommodate more functional units in a smaller space
5. The structural parts are highly versatile and flexible to assemble. With E=25mm as the module, the structure and withdrawable units can be arbitrarily combined to meet the needs of system design
6. The busbar is protected by a high-strength flame-retardant and high-insulation strength plastic functional board, which has anti-fault arc performance, making operation and maintenance safe and reliable
7. The mechanical interlocking mechanism of drawers of various sizes meets the standard requirements, with three obvious positions of connection, test, and separation, which is safe and reliable.
8. Standard module design is adopted: standard units such as protection, operation, conversion, control, adjustment, measurement, and indication can be composed respectively, and can be assembled arbitrarily according to requirements.
9. The use of high-strength flame-retardant engineering plastics effectively enhances the protection and safety performance.
10. It is highly universal and standardized, and easy to assemble. It has reliable quality assurance.
11. The cabinet can be selected with corresponding protection level according to different requirements of the working environment.
12. Equipment protection continuity and reliability
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