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MNS Low-Voltage Withdrawable Switchgear
Category :
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PRODUCT DETAILS
■ Product Overview
The MNS low-voltage withdrawable switchgear is suitable for power distribution systems with AC 50-60Hz and a rated operating voltage of 660V and below. It is used for power generation, transmission, distribution, power conversion, and control of power-consuming equipment.
This device complies with national and international standards such as IEC 60439-1, VDE 0660 Part 500, and GB 7251.1-2005 Low-Voltage Assembled Switchgear and Controlgear, and has obtained 3C Compulsory Product Certification.
■ Product Features
Strong Structural Versatility & Flexible Assembly: C-type profiles with a 25mm modulus can meet the requirements of various structural types, protection classes, and operating environments.
Compact Design: It can accommodate more functional units in a relatively small space.
Standard Module Design: Standard units for protection, operation, conversion, control, regulation, measurement, and indication can be formed respectively. Users can select and assemble them arbitrarily according to needs. More than 200 types of assembly parts can be combined into cabinet frame structures and drawer units with different schemes.
Safety: The separation between functional units and between compartments is clear and reliable. The fault of one unit will not affect the operation of other units, ensuring faults are confined to the smallest possible range.
High Technical Performance: Key parameters meet the international advanced technical level of the current era.
Space Saving: High level of standardization, serialization, and generalization significantly reduces the space required for storing and transporting prefabricated parts.
Easy Assembly: No special or complex tools are required.
■ Normal Operating Environment Conditions
Ambient air temperature: Not higher than +40℃, not lower than -5℃, and the average temperature within 24 hours does not exceed +35℃.
Atmospheric conditions: Clean air; relative humidity does not exceed 50% when the maximum temperature is +40℃. Higher relative humidity is allowed at lower temperatures (e.g., 90% at +20℃), but temperature changes that may occasionally cause moderate condensation should be taken into account.
Altitude: Not exceeding 2000 meters.
Transportation and storage temperature range for the device: -25℃ to +55℃; it can reach +70℃ for a short period (no more than 24 hours). The device shall not suffer any irreversible damage under these extreme temperatures and shall work normally under normal conditions.
If the above operating conditions cannot be met, a solution shall be negotiated between the user and the manufacturer.
When the device is used in offshore oil drilling and production or nuclear power plants, a separate technical agreement shall be signed.
■ Basic Parameters
◎ Electrical Performance
Rated operating voltage: 380V, 660V
Rated insulation voltage: 660V
Rated frequency: 50Hz
Main busbar operating current: In = 6300A - 1000A
Distribution busbar operating current: In = 1000A
Rated short-time withstand current and rated ultimate withstand current of main busbar: 50kA / 105kA
◎ Protection Class
Enclosure protection class: IP30
Rated diversity factor of power distribution cabinet: K = 0.9
Rated diversity factor of control cabinet: K = 0.6
■ Switchgear Types
Power Distribution Center Cabinet (PC): Adopts circuit breakers of E, MT, 3WL, KFW2 and other series.
Motor Control Center Cabinet (MCC):
Assembled from large and small drawers; the main switch of each circuit adopts a high-breaking molded case circuit breaker or a rotary load switch with a fuse.
Automatic Power Factor Compensation Cabinet
■ Cabinet Structure
The basic structure of the switchgear cabinet is assembled from C-type profiles. The C-type profiles are made of steel plates bent with modular mounting holes (modulus E = 25mm). All cabinet frames and inner partition plates are treated with galvanized passivation. The basic dimensions of the cabinet with doors on all sides are as shown in Table 1 and Table 2.
■ Cabinet Partition Design
◎ Power Distribution Center (PC)
The PC cabinet is divided into four compartments:
Horizontal Busbar Compartment: Located at the top or rear of the cabinet;
Functional Unit Compartment: Located at the upper front or left front of the cabinet;
Cable Compartment: Located at the lower front or right front of the cabinet;
Control Circuit Compartment: Located at the upper front of the left cabinet;
◎ Partition Measures
The Horizontal Busbar Compartment is separated from the Functional Unit Compartment and Cable Compartment by steel plates.
The Control Circuit Compartment is separated from the Functional Unit Compartment by a flame-retardant plastic cover.
The Functional Unit Compartment on the left is separated from the Cable Compartment on the right by a steel plate.
The main circuit and auxiliary circuit are designed with a partition structure. The auxiliary circuit units composed of instruments, signal lamps, buttons, etc., are all installed on the plastic instrument panel.
■ Basic Parameters
Withdrawable Motor Control Center and Low-Current Power Distribution Center (MCC)
The withdrawable MCC cabinet is divided into three compartments: the horizontal busbar compartment at the rear of the cabinet, the functional unit compartment at the front left of the cabinet, and the cable compartment at the front right of the cabinet.
The horizontal busbar compartment and the functional unit compartment are separated by a functional panel; the cable compartment is separated from the horizontal busbar compartment and the functional unit compartment by steel plates.
The drawers of the MCC (Motor Control Center) are divided into the following 5 types:
8E/4: Height × Width × Depth = 200 × 150 × 400mm
8E/2: Height × Width × Depth = 200 × 300 × 400mm
8E: Height × Width × Depth = 200 × 600 × 400mm
16E: Height × Width × Depth = 400 × 600 × 400mm
24E: Height × Width × Depth = 600 × 600 × 400mm
Power Distribution Center (PC) Cabinet
Table 1
Height (mm) | Width B (mm) | Depth T (mm) | Depth T₁ (mm) | Depth T₂ (mm) | Remarks |
2200 | 400 | 1000 | 800 | 200 | Main Busbar Transfer |
2200 | 600 | 1000 | 800 | 200 | 630A-2000A |
2200 | 600 | 1000 | 800 | 200 | 2500A |
2200 | 800 | 1000 | 800 | 200 | 3200A |
2200 | 1000 | 1000 | 800 | 200 | 4000A |
2200 | 1200 | 1000 | 800 | 200 | 6300A |
Motor Control Center (MCC) Cabinet
Table 2
Height (mm) | Width B (mm) | Width B₁ (mm) | Width B₂ (mm) | Depth T (mm) | Depth T₁ (mm) | Depth T₂ (mm) | Remarks |
2200 | 1000 | 600 | 400 | 600 | 400 | 200 | Single-Side Operation |
2200 | 1000 | 600 | 400 | 1000 | 400 | 200 | Double-Side Operation |
■ Busbar System
The main busbar is located in an independent compartment at the top or rear of the cabinet. Except for the space occupied by the busbar arranged at the top of the cabinet, there is still a relatively large space for cables to enter from the top, and this arrangement does not affect the ventilation and heat dissipation of the busbar. Depending on the current, the cabinet depth can be 600/800/1000mm.
The distribution busbar (vertical busbar) is assembled in a protective plate, which can not only prevent discharge caused by electric arcs but also avoid human contact with live parts. It is connected to the main busbar through special connectors.
The cabinet is equipped with an independent PE (Protective Earth) grounding system and N (Neutral) conductor. Both run through the entire device and are installed at the front bottom and right side of the cabinet. The grounding or neutral connection for each circuit can be made nearby. All structural components of the cabinet frame are connected with self-tapping screws, ensuring high grounding reliability.
The neutral busbar and neutral protective busbar are installed in parallel at the lower part of the functional unit compartment and vertically in the cable compartment. If the N conductor and PE conductor are separated by insulators, they are used separately; if they are short-circuited by a conductor, they form a PEN (Protective Earth Neutral) conductor.
■ Protective Grounding System
The protective circuit of the device consists of two parts: a separately installed PE conductor (or PEN conductor) that runs through the entire length of the switchgear arrangement, and conductive structural components.
Except for the outer doors and cover plates, all metal structural components in the device are galvanized. The joints of the structural components are carefully designed to allow a certain short-circuit current to pass through.
■ Auxiliary Circuit Cable Tray
An auxiliary circuit cable tray is installed at the top of the functional unit compartment. It can accommodate inter-cabinet connection wires and common power supply wires.
■ Safety Protection System
Strict isolation measures are adopted between the main busbar compartment and the electrical component compartment to prevent accidents caused by arcing from faulty switch components and short circuits between the busbars.
Upper and lower drawers are separated by a galvanized metal base plate with ventilation holes. For smaller drawers (8E/4 and 8E/2), there is strong insulation isolation between adjacent circuits.
A variety of plastic components are used in the cabinet to support live parts. These components are required to be halogen-free and have leakage-proof performance of CTI (Comparative Tracking Index) Grade 300 or above.
■ Drawer Types
There are five standard sizes, all based on the 8E (200mm) height as the reference:
8E/4: 4 drawer units assembled in the space of 8E height.
8E/2: 2 drawer units assembled in the space of 8E height.
8E: 1 drawer unit assembled in the space of 8E height.
16E: 1 drawer unit assembled in the space of 16E (400mm) height.
24E: 1 drawer unit assembled in the space of 24E (600mm) height.
The five types of drawer units can be assembled in a single cabinet either as a single-type assembly or a mixed-type assembly. The maximum number of drawer units that can be accommodated in a single cabinet with single-type assembly is shown in Table 3.
Table 3
Drawer Type | 8E/4 | 8E/2 | 8E | 16E | 24E |
Maximum Number of Accommodated Units | 36 | 18 | 9 | 4 | 3 |
■ Electrical and Mechanical Interlocking of Drawers
Drawer units are equipped with reliable mechanical interlocking devices, controlled by an operating handle, and have clear and accurate positions including opening, closing, test, withdrawn, and isolation. The functions of the operating mechanism are shown in the table below.
To enhance safety, padlocks can be added after the operating handle is positioned, with a maximum of three padlocks allowed.
After the drawer unit is in place, operations must be strictly performed in accordance with the functions and positions of the operating switches listed in Figure 6 and Figure 7. Please note that improper operation may damage easily damaged components, so users should pay attention during use.
■ Product Overview
The MNS low-voltage withdrawable switchgear is suitable for power distribution systems with AC 50-60Hz and a rated operating voltage of 660V and below. It is used for power generation, transmission, distribution, power conversion, and control of power-consuming equipment.
This device complies with national and international standards such as IEC 60439-1, VDE 0660 Part 500, and GB 7251.1-2005 Low-Voltage Assembled Switchgear and Controlgear, and has obtained 3C Compulsory Product Certification.
■ Product Features
Strong Structural Versatility & Flexible Assembly: C-type profiles with a 25mm modulus can meet the requirements of various structural types, protection classes, and operating environments.
Compact Design: It can accommodate more functional units in a relatively small space.
Standard Module Design: Standard units for protection, operation, conversion, control, regulation, measurement, and indication can be formed respectively. Users can select and assemble them arbitrarily according to needs. More than 200 types of assembly parts can be combined into cabinet frame structures and drawer units with different schemes.
Safety: The separation between functional units and between compartments is clear and reliable. The fault of one unit will not affect the operation of other units, ensuring faults are confined to the smallest possible range.
High Technical Performance: Key parameters meet the international advanced technical level of the current era.
Space Saving: High level of standardization, serialization, and generalization significantly reduces the space required for storing and transporting prefabricated parts.
Easy Assembly: No special or complex tools are required.
■ Normal Operating Environment Conditions
Ambient air temperature: Not higher than +40℃, not lower than -5℃, and the average temperature within 24 hours does not exceed +35℃.
Atmospheric conditions: Clean air; relative humidity does not exceed 50% when the maximum temperature is +40℃. Higher relative humidity is allowed at lower temperatures (e.g., 90% at +20℃), but temperature changes that may occasionally cause moderate condensation should be taken into account.
Altitude: Not exceeding 2000 meters.
Transportation and storage temperature range for the device: -25℃ to +55℃; it can reach +70℃ for a short period (no more than 24 hours). The device shall not suffer any irreversible damage under these extreme temperatures and shall work normally under normal conditions.
If the above operating conditions cannot be met, a solution shall be negotiated between the user and the manufacturer.
When the device is used in offshore oil drilling and production or nuclear power plants, a separate technical agreement shall be signed.
■ Basic Parameters
◎ Electrical Performance
Rated operating voltage: 380V, 660V
Rated insulation voltage: 660V
Rated frequency: 50Hz
Main busbar operating current: In = 6300A - 1000A
Distribution busbar operating current: In = 1000A
Rated short-time withstand current and rated ultimate withstand current of main busbar: 50kA / 105kA
◎ Protection Class
Enclosure protection class: IP30
Rated diversity factor of power distribution cabinet: K = 0.9
Rated diversity factor of control cabinet: K = 0.6
■ Switchgear Types
Power Distribution Center Cabinet (PC): Adopts circuit breakers of E, MT, 3WL, KFW2 and other series.
Motor Control Center Cabinet (MCC):
Assembled from large and small drawers; the main switch of each circuit adopts a high-breaking molded case circuit breaker or a rotary load switch with a fuse.
Automatic Power Factor Compensation Cabinet
■ Cabinet Structure
The basic structure of the switchgear cabinet is assembled from C-type profiles. The C-type profiles are made of steel plates bent with modular mounting holes (modulus E = 25mm). All cabinet frames and inner partition plates are treated with galvanized passivation. The basic dimensions of the cabinet with doors on all sides are as shown in Table 1 and Table 2.
■ Cabinet Partition Design
◎ Power Distribution Center (PC)
The PC cabinet is divided into four compartments:
Horizontal Busbar Compartment: Located at the top or rear of the cabinet;
Functional Unit Compartment: Located at the upper front or left front of the cabinet;
Cable Compartment: Located at the lower front or right front of the cabinet;
Control Circuit Compartment: Located at the upper front of the left cabinet;
◎ Partition Measures
The Horizontal Busbar Compartment is separated from the Functional Unit Compartment and Cable Compartment by steel plates.
The Control Circuit Compartment is separated from the Functional Unit Compartment by a flame-retardant plastic cover.
The Functional Unit Compartment on the left is separated from the Cable Compartment on the right by a steel plate.
The main circuit and auxiliary circuit are designed with a partition structure. The auxiliary circuit units composed of instruments, signal lamps, buttons, etc., are all installed on the plastic instrument panel.
■ Basic Parameters
Withdrawable Motor Control Center and Low-Current Power Distribution Center (MCC)
The withdrawable MCC cabinet is divided into three compartments: the horizontal busbar compartment at the rear of the cabinet, the functional unit compartment at the front left of the cabinet, and the cable compartment at the front right of the cabinet.
The horizontal busbar compartment and the functional unit compartment are separated by a functional panel; the cable compartment is separated from the horizontal busbar compartment and the functional unit compartment by steel plates.
The drawers of the MCC (Motor Control Center) are divided into the following 5 types:
8E/4: Height × Width × Depth = 200 × 150 × 400mm
8E/2: Height × Width × Depth = 200 × 300 × 400mm
8E: Height × Width × Depth = 200 × 600 × 400mm
16E: Height × Width × Depth = 400 × 600 × 400mm
24E: Height × Width × Depth = 600 × 600 × 400mm
Power Distribution Center (PC) Cabinet
Table 1
Height (mm) | Width B (mm) | Depth T (mm) | Depth T₁ (mm) | Depth T₂ (mm) | Remarks |
2200 | 400 | 1000 | 800 | 200 | Main Busbar Transfer |
2200 | 600 | 1000 | 800 | 200 | 630A-2000A |
2200 | 600 | 1000 | 800 | 200 | 2500A |
2200 | 800 | 1000 | 800 | 200 | 3200A |
2200 | 1000 | 1000 | 800 | 200 | 4000A |
2200 | 1200 | 1000 | 800 | 200 | 6300A |
Motor Control Center (MCC) Cabinet
Table 2
Height (mm) | Width B (mm) | Width B₁ (mm) | Width B₂ (mm) | Depth T (mm) | Depth T₁ (mm) | Depth T₂ (mm) | Remarks |
2200 | 1000 | 600 | 400 | 600 | 400 | 200 | Single-Side Operation |
2200 | 1000 | 600 | 400 | 1000 | 400 | 200 | Double-Side Operation |
■ Busbar System
The main busbar is located in an independent compartment at the top or rear of the cabinet. Except for the space occupied by the busbar arranged at the top of the cabinet, there is still a relatively large space for cables to enter from the top, and this arrangement does not affect the ventilation and heat dissipation of the busbar. Depending on the current, the cabinet depth can be 600/800/1000mm.
The distribution busbar (vertical busbar) is assembled in a protective plate, which can not only prevent discharge caused by electric arcs but also avoid human contact with live parts. It is connected to the main busbar through special connectors.
The cabinet is equipped with an independent PE (Protective Earth) grounding system and N (Neutral) conductor. Both run through the entire device and are installed at the front bottom and right side of the cabinet. The grounding or neutral connection for each circuit can be made nearby. All structural components of the cabinet frame are connected with self-tapping screws, ensuring high grounding reliability.
The neutral busbar and neutral protective busbar are installed in parallel at the lower part of the functional unit compartment and vertically in the cable compartment. If the N conductor and PE conductor are separated by insulators, they are used separately; if they are short-circuited by a conductor, they form a PEN (Protective Earth Neutral) conductor.
■ Protective Grounding System
The protective circuit of the device consists of two parts: a separately installed PE conductor (or PEN conductor) that runs through the entire length of the switchgear arrangement, and conductive structural components.
Except for the outer doors and cover plates, all metal structural components in the device are galvanized. The joints of the structural components are carefully designed to allow a certain short-circuit current to pass through.
■ Auxiliary Circuit Cable Tray
An auxiliary circuit cable tray is installed at the top of the functional unit compartment. It can accommodate inter-cabinet connection wires and common power supply wires.
■ Safety Protection System
Strict isolation measures are adopted between the main busbar compartment and the electrical component compartment to prevent accidents caused by arcing from faulty switch components and short circuits between the busbars.
Upper and lower drawers are separated by a galvanized metal base plate with ventilation holes. For smaller drawers (8E/4 and 8E/2), there is strong insulation isolation between adjacent circuits.
A variety of plastic components are used in the cabinet to support live parts. These components are required to be halogen-free and have leakage-proof performance of CTI (Comparative Tracking Index) Grade 300 or above.
■ Drawer Types
There are five standard sizes, all based on the 8E (200mm) height as the reference:
8E/4: 4 drawer units assembled in the space of 8E height.
8E/2: 2 drawer units assembled in the space of 8E height.
8E: 1 drawer unit assembled in the space of 8E height.
16E: 1 drawer unit assembled in the space of 16E (400mm) height.
24E: 1 drawer unit assembled in the space of 24E (600mm) height.
The five types of drawer units can be assembled in a single cabinet either as a single-type assembly or a mixed-type assembly. The maximum number of drawer units that can be accommodated in a single cabinet with single-type assembly is shown in Table 3.
Table 3
Drawer Type | 8E/4 | 8E/2 | 8E | 16E | 24E |
Maximum Number of Accommodated Units | 36 | 18 | 9 | 4 | 3 |
■ Electrical and Mechanical Interlocking of Drawers
Drawer units are equipped with reliable mechanical interlocking devices, controlled by an operating handle, and have clear and accurate positions including opening, closing, test, withdrawn, and isolation. The functions of the operating mechanism are shown in the table below.
To enhance safety, padlocks can be added after the operating handle is positioned, with a maximum of three padlocks allowed.
After the drawer unit is in place, operations must be strictly performed in accordance with the functions and positions of the operating switches listed in Figure 6 and Figure 7. Please note that improper operation may damage easily damaged components, so users should pay attention during use.
■ Arrangement and Combination of Primary Schemes
The total height of the Functional Unit Compartment is 72E.
In the same device, the general arrangement rule of functional units is: small functional units are placed on the upper part, and large functional units are placed on the lower part.
Four 8E/4 drawers form one 8E Installation Unit;
Two 8E/2 drawers form one 8E Installation Unit;
Or two 8E/4 drawers and one 8E/2 drawer form one 8E Installation Unit.
The number of current transformers shown in the scheme is the maximum number of installations for that scheme (In Schemes 01-19 and 21-39, one additional current transformer can be added for the reactive power compensation circuit). In actual use, the number of current transformers can be reduced or omitted as needed.
The device has two depth specifications:
600mm (for MCC single-side operation cabinets);
1000mm (for PC cabinets and MCC double-side operation cabinets).
It is recommended that PC and MCC be arranged separately. When a segmented functional panel is used, mixed assembly of PC and MCC in the same cabinet is allowed.
When the two types of devices (PC and MCC) are arranged adjacent to each other:① Deepen the single-side operation MCC to 1000mm, as shown in Diagram Example 2 below.② When the MCC double-side cabinet (or the MCC single-side cabinet with a depth of 600mm) is arranged adjacent to the PC cabinet, a transfer cabinet (with a width of 400mm) must be added between the two cabinets, as shown in the diagram example below.
■ Combination Modes of Switchgears
1.Power Receiving Cabinet (PC Cabinet)
2.Tie Cabinet (PC Cabinet)
3.Motor Control Cabinet (MCC Cabinet)
4.Main Busbar Transfer Cabinet
5.Side Panel
■ Installation, Assembly and Maintenance
The overall dimensions of the device are shown in Table 1 and Table 2.
After the device is delivered to the destination, first check whether the packaging is intact. If it is not to be installed immediately, it should be stored in a dry and clean place.
The device is recommended for free-standing installation (not against the wall) and can also be installed in a wall-mounted manner. The installation foundation surface must be level; the horizontal error of the foundation channel steel is 1/1000, and the total length deviation is 3mm.
For the screw fastening of all conductive parts, Grade 8.8 bolts and lock washers are recommended. The calculated tightening torque values are shown in the table below.
The accessories for the MCC scheme include two specifications of cable head sheaths and a certain number of copper connectors for the secondary circuit. After the cables are connected, the bottom of the device should be sealed to prevent small animals from crawling into the cabinet and causing short-circuit accidents.
After the device is installed or adjusted, the following inspections and tests must be conducted before it is put into operation:① Check whether the electrical equipment installed in the device and the control wiring comply with the factory drawing requirements.② Manually operate various switches; the operation should be flexible without abnormalities or jamming.③ Check whether the mechanical interlocking mechanism and electrical interlocking device act correctly and reliably, which should meet the system requirements.④ Check whether the insulation resistance of the main circuit and control circuit meets the specified requirements.⑤ Check whether the electrical equipment installed in the device is in good condition and complies with the technical specifications of the equipment itself.⑥ Check whether there are foreign objects inside the device and whether the mounting screws of each component are loose.
Operating Instructions for Withdrawable MCC
① The bottom of the drawer must be correctly inserted into the guides before being pushed into the cabinet; otherwise, problems such as drawer damage or inability to pull it out may occur.② The symbol marks and functions on the panel of 8E/4 and 8E/2 drawers are shown in Figure 6. The arrow from the open position "O" to the operating position "1" in the figure indicates the following operation: first push the operating handle inward, then rotate the handle from "O" to "1". When returning, no pushing is required—just rotate the handle from "1" to "O", and the handle will pop out automatically after being released.③ The symbol marks and functions on the panel of 8E-24E drawers are shown in Figure 7. When the handle reaches the operating position "", the mechanism releases the mechanical interlock of the main switch. At this time, the main switch can be closed or opened; however, after the main switch is opened or closed, the handle of the interlocking mechanism cannot be operated.
There is a small plastic box on the door at the lower right corner of the symbol mark, which is the door interlocking mechanism. The operation process is as follows: When the drawer is in the operating position, if you need to open the door, first pull out the small box, then insert a screwdriver into the hole and move the lock catch downward to open the door. After opening the door, be sure to close the plastic box; otherwise, the original protection class will be damaged.
Table 4
Bolt Specification | Tightening Torque (Nm) |
M6 | 9.5 |
M8 | 25 |
M10 | 45 |
M12 | 80 |
M16 | 200 |
■ Transportation and Storage of the Device
The device must not be tipped over or subjected to severe vibration.
When hoisting the device after unpacking, transport angle plates shall be used, and the angle between two steel cables shall be ≤ 120°, as shown in Figure 6. If using a chain hoist, rollers, or a crowbar, direct operation on the device’s base frame is not allowed.
If the device needs to be moved a short distance during positioning and installation, it can be pried at the four corners of the base frame.
Random disassembly of electrical products and components inside the device is not allowed.
The device shall be protected from rain and moisture, and the ambient temperature shall comply with the relevant provisions in this brochure.
■ Main Circuit Scheme
