GCK (functionally equivalent to or superior to GCL) low-voltage withdrawable switchgear assemblies (hereinafter referred to as "switchgear") are designed for use in AC three-phase four-wire and three-phase five-wire systems with a rated operating voltage of 380V. These switchgear units serve critical functions in power systems, including power generation plants, substations, industrial and mining facilities, and high-rise buildings—for tasks such as incoming power supply, power distribution, reactive power compensation, energy metering, lighting control, and centralized motor control.
GCK (functionally equivalent to or superior to GCL) low-voltage withdrawable switchgear assemblies (hereinafter referred to as "switchgear") are designed for use in AC three-phase four-wire and three-phase five-wire systems with a rated operating voltage of 380V. They serve critical functions in power systems, including power generation plants, substations, industrial and mining enterprises, and high-rise buildings—for tasks such as power reception, distribution, reactive power compensation, energy metering, lighting control, and centralized motor control.
This product complies with the standards: GB7251.12-2013 "Low-Voltage Switchgear and Control Equipment," JB/T9661 "Low-Voltage Withdrawable Switchgear," and IEC60349 "Low-Voltage Switchgear and Control Equipment."
Normal operating conditions
● Altitude: 2500m and below.
● Ambient temperature: -15°C to +40°C, with a daily average not exceeding +35°C.
● Relative humidity: Not exceeding 50% at a temperature of +40°C; however, higher relative humidity levels are permissible at lower temperatures, with occasional condensation potentially occurring—e.g., up to 90% at +20°C.
● Locations free from fire hazards, explosion risks, severe pollution, chemical corrosion, and intense vibrations.
● Tilted no more than 5° from the vertical plane.
● Suitable for transportation and storage processes within the following temperature range: -25°C to +55°C, with short-term exposure (not exceeding 24 hours) up to +70°C.
●If the above-mentioned usage conditions cannot be met, the user should consult with our company and propose a solution when placing an order.
Main technical specifications
● Rated insulation voltage: 660V, 1000V.
● Rated operating voltage: 380V, 660V.
● Auxiliary circuit rated voltage: AC 220V, 380V, DC 110V, 220V.
● Rated frequency: 50 Hz ~ (60) Hz.
● Rated current: Horizontal busbar ≤ 6300 A; vertical busbars: 630 A, 800 A, 1200 A.
Ordering Instructions (Please specify when placing your order)
1. Main circuit scheme number, purpose, single-line system diagram, arrangement drawing, and distribution room layout plan, etc.
2. Schematic diagram of the auxiliary circuit wiring and terminal arrangement diagram.
3. Model, specifications, and quantity of electrical components within the switchgear.
4. Requirements for control, measurement, and protection functions of switching equipment, as well as requirements for other interlocking and automatic devices.
5. If bus bridges are required to connect switchgear units or incoming feeder cabinets, please provide specific requirements such as the rated current-carrying capacity of the bus bridge, its span length, and the height from the ground.
6. When attachments or spare parts are needed, please specify the type and quantity required.
7. If the switchgear is to be used in special environmental conditions, other specific requirements should be clearly specified at the time of order placement.
Structural Features
GCK's basic framework features a modular, prefabricated structure. All structural components of the cabinet frame are galvanized and powder-coated, then securely fastened together using screws to form the core frame. Additional parts such as doors, panels, dividers, drawers, mounting brackets, busbars, and electrical components can then be added as needed, allowing the assembly of a fully functional control center cabinet. This cabinet design boasts the following key features:
1. Cabinet frame
The cabinet frame is assembled using C-channel profiles, and all frame components—as well as dedicated配套 parts—are supplied by our company to guarantee the precision and quality of the cabinet body.
1.1 The molding dimensions of components, opening sizes, and equipment spacing shall follow a modular system. (Modular unit E = 20 mm, unless otherwise specified).
1.2 Internal structural components are galvanized.
1.3 The cabinet top cover is detachable; once removed, you’ll find lifting loops installed at the four corners of the cabinet top, designed for hoisting and transportation.
1.4 Externally phosphated, followed by electrostatic epoxy powder coating.
1.5 The cabinet is divided into three mutually isolated compartments: the busbar chamber, the functional unit chamber, and the cable chamber, which helps prevent the spread of accidents and facilitates live maintenance.
2. Functional Unit (Drawer Section) 2.1 Functional Units: Feeding Unit, Motor Unit, Utility Power Unit. 2.2 The drawer unit height is standardized at 200mm, available in five size series: 1/2 unit, 1 unit, 1.5 units, 2 units, and 3 units. Each unit circuit has a rated current of up to 630A. 2.3 Each MCC cabinet can accommodate up to 9 single-unit drawers or 18 half-unit drawers. 2.4 The door panel of the compartment features a mechanical interlock between the main switch's operating mechanism and the drawer—when the main switch is in the closed position, the drawer cannot be pulled out. 2.5 The operating mechanism of the main switch can be locked in the closed or open position using a padlock, allowing for safe maintenance of electrical equipment. 2.6 The back of the functional unit features a main circuit inlet/outlet plug, an auxiliary circuit secondary plug, and a grounding plug. 2.7 The grounding plug ensures the continuity of the protective circuit when the drawer is in the disconnected test connection position. 2.8 The functional unit compartments are separated by metal partitions. 2.9 The compartment door automatically opens and closes as the drawer is pushed in and pulled out, ensuring it does not come into contact with the vertical busbar inside the compartment. 2.10 The drawer unit features a rotary push mechanism with a three-position function, offering simple and reliable operation. 2.11 Drawer Operation Mechanism Description The CJ-5 drawer actuation mechanism (hereinafter referred to as the "mechanism") operates by moving along a helical path guided by a positioning component, enabling functional units to be pushed in and pulled out. During this process, it provides three-position display and mechanical interlocking, and when equipped with a microswitch in the test position, it also supports electrical interlocking—preventing potential safety hazards or equipment damage while complying with relevant national and industry standards. This product features a compact design, flexible installation options, and reliable performance.
3 Busbar System 3.3 The vertical busbars are enclosed in polycarbonate engineering plastic housings. 3.2 The SWGCK and GCL busbar systems utilize three-phase four-wire and three-phase five-wire configurations. The horizontal busbars are mounted on the top of the cabinet, while the N and PE lines can be installed either at the top or in the lower section of the cabinet.
3.3 The three-phase horizontal busbars are made of copper, offering high mechanical strength and excellent heat dissipation. The horizontal copper busbars for switchgear are selected as shown in the table.
Rated Current (A)
Copper Busbar Specifications (mm)
630
50 * 5
1250
60 * 10
1600
80 * 10
2000
100 * 10
2500
2(80*10)
3150
2(100 × 10)
Main Circuit Diagram
Scheme Number
01
02
03
04
05
06
07
Main Circuit Diagram
Uses
Overhead power supply
Cable power supply
Bus tie
Rated Current (A)
630–1600
2000–3150
630–1600
2000–3150
630–1600
2000–3150
Major electrical components
Circuit breaker
DW45-1000~3200
Current transformer
LMK-0.66"/5
Cabinet width (mm)
800
1000
800
1000
800
1000(1200)
Small room height (mm)
1800
1800
1800
1800
1800
1800
Explanation
When the rated current exceeds 3150 A, users should consult with the manufacturer.
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