Main features：
GCK (functionally equivalent to or superior to GCL) low-voltage withdrawable switchgear assembly (hereinafter referred to as "switchgear") is suitable for rated working voltage of 380V, three-phase four-wire and three-phase five-wire systems. It is used in power systems for power plants, substations, industrial and mining enterprises, and high-rise buildings for receiving power, distributing power, reactive power compensation, energy metering, lighting, and centralized control of electric motors. 

This product complies with: GB7251 "Low-Voltage Switchgear and Controlgear", JB/T9661 "Low-Voltage Withdrawable Switchgear", and IEC439 "Low-Voltage Switchgear and Controlgear" standards.

Normal operating environmental conditions:
Altitude: 2000m and below. Ambient temperature: -5°C to +40°C, with the daily average temperature not exceeding +35°C. Relative humidity: Not exceeding 50% at a temperature of +40°C; at lower temperatures, a higher relative humidity is allowed, and condensation may occur occasionally, such as at +20°C, which is 90%.
No fire, explosion hazards, severe pollution, chemical corrosion or severe vibration.
No inclination greater than 50% from the vertical plane.
Suitable for transportation and storage processes at the following temperatures: -25°C to +55°C. Within a short period (not exceeding 24 hours), not exceeding +70°C.
If the above usage conditions cannot be met, the user should inform the company during the order placement and communicate for customization. 

Main technical parameters：
Rated insulation voltage: 660V, 1000V;
Rated working voltage: 380V, 660V;
Auxiliary circuit rated voltage: AC 220V, 380V, DC 11V, 220V;
Rated frequency: 50Hz - (60)Hz;
Rated current: Horizontal bus < 3150A; Vertical bus 630A, 800A, 1200A;
Rated short-time withstand current: 50, 80 kA/1s, Neutral bus 30 kA/1s;
>Rated peak current: 105 kA/0.1s, 50 kA/0.1s;
Function unit (drawer) interrupting capacity: 50 kA (effective value);
Enclosure protection class: IP30, IP40;
Bus configuration: Three-phase four-wire system, Three-phase five-wire system;
Operation mode: Local, Remote, Automatic. 

Structural features:
The basic framework of GCK is a combined prefabricated structure. All the structural components of the cabinet frame have undergone electroplating and powder coating treatment and are connected by screws to form the basic cabinet. Then, according to the requirements, doors, baffles, partitions, drawers, installation brackets, busbars and electrical components, etc. are added to assemble a complete control center cabinet. The structure of this cabinet has the following characteristics.
1. Cabinet frame:
The cabinet frame is assembled using C-shaped profiles. The cabinet frame components and special matching parts are supplied by our company to ensure the accuracy and quality of the cabinet body.
1.1 The forming dimensions, opening dimensions of the components, and equipment spacing are all standardized (modulus E = 20mm, the same below).
1.2 The internal structure is treated with galvanization.
1.3 The top cover of the cabinet is detachable. By removing the top cover, the four corners on the top of the cabinet can be seen, which are equipped with lifting rings for lifting and transportation.
1.4 The exterior is treated with phosphating and then electrostatic epoxy powder spraying.
1.5 The cabinet frame is divided into three isolated intervals: busbar room, functional unit room, and cable room. This can prevent the spread of accidents and facilitate live maintenance. 

2 .Functional Units (Drawer Section):
2.1 Functional Units: Power Supply Unit, Motor Unit, Common Power Supply Unit.
2.2 The height modulus of the drawer unit is 200mm. It is divided into five series of sizes: 1/2 unit, 1 unit, 1.5 unit, 2 units, and 3 units. The rated current of the unit circuit is below 630A.
2.3 Each MCC cabinet can accommodate a maximum of 9 one-unit drawers or 18 1/2-unit drawers.
2.4 The door panel of the compartment is mechanically connected to the main switch by the operating mechanism of 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 with a single lock, allowing for safe maintenance of electrical equipment.
2.6 The back of the functional unit has main circuit inlet and outlet plugs, auxiliary circuit secondary plugs, and grounding plugs.
2.7 The grounding plug ensures the continuity of the protection circuit when the drawer is in the separation test connection position.
2.8 The compartment of the functional unit is separated by metal partitions.
2.9 The valves in the compartment automatically open and close as the drawer is pushed in and pulled out, preventing it from touching the vertical busbar within the compartment.
2.9 The drawer unit adopts a rotating push mechanism, with three-position functions, which is simple and reliable.
2.10 The drawer operation mechanism description: CJ-5 drawer push mechanism (hereinafter referred to as the mechanism) uses a spiral trajectory along the positioning piece to achieve the advancement and withdrawal of the functional unit. During the advancement and withdrawal of the functional unit, it realizes three-position display and mechanical interlock, and is equipped with a microswitch. When the test position is reached, electrical interlock can be performed. This avoids causing personal or equipment accidents and complies with relevant national and industry standards. This product has a small size, flexible installation methods, and reliable performance.

3. Busbar System
3.1 The vertical busbars are enclosed in a polycarbonate engineering plastic casing.
3.2 The GCK and GCL busbar systems adopt three-phase four-wire and three-phase five-wire systems. The horizontal busbars are installed in the cabinet walls.
The N line and PE line can be installed either in the cabinet top or at the bottom of the cabinet.
3.3 The three-phase horizontal busbars have high mechanical strength and good heat dissipation performance. The copper busbars for the switchgear are selected as follows (see the table). 

Dimensions and installation size:
Effective installation height: 1800mm.
1. The width of the power distribution cabinet and the busbar connection cabinet is divided according to the switch current level and the incoming/outgoing line mode: 600, 800, 1000, 1200, (800 + 400)mm; the cabinet depth is 800, 1000mm (1000mm is recommended; for the outgoing line cabinet on the upper inlet line, 1000mm must be used).
2. Feeder cabinet
Width: 600, 800mm; depth: 800, 1000mm (1000mm is recommended; for the outgoing line cabinet, 1000mm must be used).
3. Motor control cabinet (MCC)
Width: 600, 600 + 200mm; depth: 800, 1000mm (1000mm is recommended; for the outgoing line cabinet, 1000mm must be used).
4. Power factor compensation cabinet
Width: 600 (4, 6 circuits), 800 (8 circuits), 1000 (10 circuits)mm;
Depth: 800, 1000mm.