Overview
MNS type low-voltage withdrawable switch cabinet is a modular, multi-functional low-voltage distribution cabinet. It is mainly used in low-voltage systems, power distribution and motor control systems in the fields of metallurgy, petroleum, chemical industry, industrial and mining enterprises and infrastructure, etc. where reliability is required.
The cabinet structure adopted by the MNS type low-voltage withdrawable switch cabinet is highly flexible. According to your needs or different usage occasions, various types and specifications of components can be installed in the cabinet; according to different electrical equipment. Multiple types of feed units can be installed in the same series of cabinets or in the same cabinet. For example, the feeder circuit and the motor control circuit can be mixed together.
MNS type low-voltage withdrawable switch cabinet is a full range of low-voltage switch cabinets that can meet your all-round needs. Applicable to all low-voltage systems below 4000A.
MNS type low-voltage withdrawable switchgear provides you with a high level of reliability and safety. The humanized design enhances the protection of personal and equipment safety.
The MNS type low-voltage withdrawable switchgear is a fully assembled structure. Its unique profile structure and connection methods, as well as its compatibility with various elements, can meet the requirements of demanding construction periods and power supply continuity.
Implementation standards: IEC60439, GB7251
Technical parameters
1. General data
1.1 Application: power distribution, motor control
1.2 Implementation standards: IEC60439, GB7251.1
1.3 Ambient temperature: -5℃~40℃
1.4 Ambient relative humidity 40℃ More than 50%, at lower temperatures
Higher relative humidity, such as: 90% at 20℃
1.5 Installation location: indoors
1.6 Altitude: ≤2000m
2. Mechanical data
2.1 Incoming and outgoing wire form: cable/busbar duct (bridge)
2.2 Cable incoming and outgoing: top/bottom
2.3 Wiring Form: front of cabinet/back of cabinet
2.4 Protection level: P30, IP40, IP54
2.5 Functional unit isolation form: full isolation or partial isolation
3. Cabinet size
3.1 Height: 2200
3.2 Width: 600, 800, 900, 1000
3.3 Depth: 600, 800, 1000
3.4 Surface treatment :High voltage electrostatic epoxy powder spraying≥60μ
4. Electrical data
4.1 Rated insulation voltage: to 1000V
4.2 Rated operating voltage: to 660V
4.3 Rated frequency: 50/60HZ
4.4 Rated impulse withstand voltage: 8KV
4.5 Auxiliary circuit rated voltage: AC380, 220V/DC220V
4.6 Overvoltage level: III
4.7 Pollution level: 3
4.8 Rated current: 4000A
4.9 Rated current of horizontal busbar: 4000A
4.10 Rated current of vertical busbar: 2000, 1000A
5. Horizontal busbar
5.1 Rated short-time withstand current: 50/80KA
5.2 Rated peak withstand current: 105/176KA

6. Vertical busbar
6.1 Rated short-time withstand current: 50KA
6.2 Rated peak withstand current: 105KA
7. Grounding system TT, IT, TN-S, TN
8. Maximum incoming and outgoing line circuit breaker: 4000A
8.1 Cabinet with glass door , its minimum depth is 725cm.
8.2 In order to facilitate the laying of horizontal busbars, the cabinet depths of systems with the same arrangement should be uniform. If not, a 400-wide busbar transfer cabinet should be added to each connection.
8.3 For cabinets with bus bridges or bus ducts for incoming and outgoing wires, the depth should be >800.
Note: For products with special requirements, please consult the manufacturer.
Technical Parameters
1. In order to facilitate the installation of equipment and on-site construction, a dedicated cable channel is provided in the distribution cabinet with corresponding cable fixings.
2. Each position of the drawer unit is accurately positioned and clearly indicated, and each position can be locked with up to 3 padlocks.
3. The special profile structure and connection method ensure the strength of the cabinet.
4. The drawer unit uses contact wires to directly plug into the "L"-shaped vertical busbar, which is simple and reliable.
5. The unique 3-section guide rail makes the drawer in and out more flexible and convenient, and the internal components and wiring can be inspected, maintained or replaced without the drawer unit detaching from the cabinet.

Division of areas within distribution cabinets
According to the different functions of each part, the power distribution cabinet can be divided into 4 independent compartments
1. Horizontal busbar room (an independent compartment located behind the cabinet or on the top of the cabinet)
1.1 When the front outlet is used, the horizontal busbar is placed behind the cabinet.
1.2 The horizontal busbar is also placed on the top of the cabinet.
2. Vertical busbar room (an independent compartment located on the left side behind the cabinet). The vertical busbar adopts an "L" shaped busbar and is placed in a dedicated fully enclosed functional board. This not only ensures the stability of the vertical busbar, but also allows the protection level of the live parts to reach IP20 after the drawer unit is pulled out.
3. Functional unit room (independent compartments located on the left side of the front of the cabinet). Drawer units or fixed dividing units.
4. The cable room is located on the right side of the front of the cabinet when the cable is coming out from the front; it is located on the right side of the back of the cabinet when the cable is coming out from the rear.
Structural features

1. Skeleton
1.1 The cabinet skeleton is made of special C profiles (module 25mm) with tee connections, fastened and assembled by locking self-tapping screws and high-strength bolts. This material has a variety of specifications and sizes, and can be used to form cabinet frames of different specifications according to corresponding modules according to different cabinet types or actual needs.
1.2 The cabinet is made of 2mm cold-rolled steel plate or imported aluminum-zinc plate.
2. Shell
According to the cabinet structure and actual needs, various types of panels can be installed on the cabinet frame for protection.
2.1 Front of the cabinet
a. Transparent glass door
b. Ordinary door panel
c. Drawer panel
d. Ventilation, door
2.2 Behind the cabinet
a. Open the door behind the cabinet
b. The cabinet installed against the wall uses a sealing plate at the back of the cabinet and is directly fixed with screws
2.3 Cabinet side: Side plate fixed with screws
2.4 cylindrical top
a. Top cover plate (open ventilation holes, and match the corresponding outlet ring or flange plate according to the size of the cable when going out)
2.5 Cabinet bottom: bottom cover (with corresponding outlet ring or flange plate according to the size of the cable)
2.6 Complete partitions are used to separate cabinets.
3. Cabinet combination form
3.1 Drawer cabinet (MCC)
a. Drawer cabinet The cabinet is composed of drawers, cabinet frame and related components. The electrical components are all fixedly installed in the drawer. The standard drawer unit specifications include 8E/4, 8E/2, 8E, 16E, and 24E (E=25mm). Drawers of the same specifications can be easily interchanged.
b. The rated current of the drawer is up to 400A. Each device can be configured with nine 8E unit drawers, which can be combined into up to 36 circuits (8E/4).
C. Mainly used for motor control circuits and can also be used for power distribution.
3.2 weeks for ordering
This type of cabinet is mainly used as incoming cabinet, contact cabinet, capacitor compensation cabinet, frequency converter cabinet, soft start cabinet, etc.
3.3 Mixed cabinets
a. Drawer units and peripheral units can be mixed and installed in a cabinet frame, and can be combined in units of 8E according to the module.
b. Can be used in situations where there are both power distribution circuits and motor control circuits.
3.4 Defined partition cabinets
3. Each circuit unit is isolated from each other, and plug-in or withdrawable circuit breakers are used to ensure the convenience of equipment maintenance and repair.
4. Horizontal busbar
4.1 Horizontal busbar layout of the switch cabinet. The horizontal busbar compartment of the switch cabinet can be placed Behind the cabinet or on top of the cabinet.
4.2 When the horizontal busbar is placed behind the cabinet, it can be divided into upper and lower layouts.
a. Each phase busbar of the single-layer horizontal busbar system consists of 2 busbars, and is suitable for dry system currents of 2500A and below.
b. When the system current exceeds 2500A, the horizontal busbar is arranged in double layers. Each phase busbar is composed of 4 busbars (rated current can reach 4000A). The cross-sectional sizes of the two-layer main busbars can be different.
c. The busbar material is T2 copper, and the specifications are (30mmx10mm, 60mmx10mm, 80mmx10mm). Busbars with different cross-sectional sizes can also be connected, and no holes are required to connect the horizontal busbar to the busbar in the cabinet.
4.3 In the cabinet with rear outlet structure, the horizontal busbar must be placed on the top of the cabinet (the maximum current is 3150A. When it exceeds 3150A, one 8E unit must be reduced, that is, the height occupied by the cabinet functional unit is 1600mm)
5. Vertical busbar
5.1. The vertical busbar is arranged in the vertical busbar room and is used for the connection between the functional units and the busbar. The vertical busbar uses an "L" type right-angle copper busbar and is placed in a special multi-functional board. It can be three-phase or Four phases.
5.2. After the drawer unit is pulled out, its protection level can reach IP20.
6. Protective conductor
6.1 The protective conductor is used to ensure the equipotential connection of the skeleton. It consists of horizontal and vertical conductors located in each cabinet. The horizontal conductor is connected to the cabinet skeleton and other horizontal conductors. The vertical conductor is used for the protective conductor and grounding wire of the power cable. connect.
6.2 The cross-section of the protective conductor can be made from standard copper busbars of corresponding specifications according to the actual current needs.
7. Control small bus
7.1 The control small bus is used to provide power for the entire control loop and working power for some communication equipment or field buses.
7.2 The small control busbar can be installed in a dedicated compartment and can be laid throughout the system as needed.
8. Cable room
8.1 The dedicated channel for laying power cables and control cables is located in an independent compartment in front or behind the cabinet.
8.2 There are dedicated primary and secondary terminals and corresponding cable fixings in the cable room.
8.3 Depending on the actual size of the cables and the way in and out of the cabinet, a cable outlet ring or outlet flange plate should be installed on the bottom plate or top cover.
8.4 The size of the cable room can be expanded or compressed according to the corresponding module according to user needs.
Functional unit
1. Drawer type functional unit

1.1 The drawer is composed of functional components including several mechanical mechanisms. These mechanisms ensure that the drawer is connected/tested/detached/removed, etc., and can be locked with padlocks at different positions. At the same time, display, control and human-machine interface components are also integrated on the front panel.

1.2 By operating the handle and large chain, the drawer can be accurately positioned at the connection/test/separation/removal and other positions. Each position has a corresponding mark on the front panel, which is simple and intuitive.

1.3 When the circuit breaker is closed, the mechanical interlocking device prohibits the drawer from moving to ensure the safety of operation.

1.4 During the operation, it is possible to adjust or check the internal condition of the drawer, so the drawer panel needs to be opened. At this time, the corresponding unlocking tool can be used to open the drawer panel.

1.5 Each drawer unit is completely independent, and the drawers are completely isolated.

1.6 Drawer units of the same specifications can be flexibly interchanged.

1.7 The outlet side is directly connected to the fixed outlet adapter, and the secondary line is connected with a dedicated secondary connector. (The secondary plug-in 8E/4 unit has a maximum of 16 cores, and the 8E/2 unit and above have 32 cores).

1.8 Drawer units of various specifications have corresponding entry and exit guide rails and rollers to guide their entry and exit and positioning. The use of rollers can effectively reduce the force required for operation.

1.9 The special three-section guide rail not only makes the drawer in and out more flexible, but also effectively ensures that the drawer can be guided out of the cabinet frame. Even if the drawer unit does not leave the frame, the drawer unit can be inspected or maintained.

1.10 Depending on the height of the drawer unit or the size of the circuit current, a push mechanism can also be installed on drawers with one unit or more.

1.11 Drawer units are especially suitable for motor control circuits. For power distribution circuits, they can also be selected according to various functions and actual needs.

2. Fixed separated functional units (based on fixed or plug-in components)

2.1 This type of functional unit retains the advantages of a simple structure and easy operation of the circumferential unit, and also has the characteristics of clear separation and reliability of the drawer cabinet functional units. Suitable for either power distribution circuit or motor circuit.

2.2 Plug-in components can be pulled out for maintenance or replacement without cutting off the power supply. The use of such components can ensure that only the components of the corresponding circuit can be pulled out during equipment maintenance without affecting other parts of the entire power distribution system. loop.

2.3 Through the interlocking between the operating mechanism and the rotating handle on the panel, it can be ensured that the door cannot be opened when the circuit breaker is closed, which enhances the safety of the equipment.

2.4 When the equipment is running, if you need to set or check the internal components of the unit, you can use the corresponding unlocking tool to open the panel.

3. The withdrawable functional unit
3.1 equipment away from the cabinet is installed on the base of each cradle. It has four positions: working/testing/disconnecting/withdrawing. There are corresponding status indicators at each position and can be locked in this position.

3.2 When changing the position, there are corresponding position changes in front of the switch, which means that the IP20 protection level can be maintained in various positions.

3.3 This solution greatly simplifies the maintenance of high-power equipment and can be used as incoming, contact and distribution circuits.