■ Product Overview

The GCK low-voltage switchgear cabinet is a product designed in the early 1990s by the Tianjin Electric Rotation Research Institute. Our company has signed a technology transfer agreement with the Tianjin Electric Rotation Research Institute. This cabinet incorporates the advantages of domestic low-voltage cabinets and represents a new generation of products, with the following characteristics:

The product adopts a modular structure. Its cabinet frame consists of columns and rails formed by stamping thin steel plates using a special process. Special-purpose connectors, doors, and various mounting plates are all fastened together with screws.

This cabinet frame structure eliminates welding deformation and stress.

The external dimensions of the frame, as well as the external dimensions and hole-opening dimensions of spare parts, are designed with modular variations, facilitating selection by engineering designers.

The cabinet is available in three types: drawer-type, fixed-type, and hybrid-type.

Spare parts feature high universality and strong adaptability. The withdrawal process is convenient and flexible, with no jamming or collision. The centerlines of moving contacts and fixed contacts are aligned. Due to its special design, the grounding contacts are 5mm longer than the phase contacts, and the contacts maintain tight contact. When the unit is put into operation, the grounding contacts make contact before the main contacts; when withdrawn, the grounding contacts disconnect after the main contacts. This ensures the personal safety of operators. The cabinet also offers advantages such as operating position, test position, and withdrawn position.

The front-left side of the cabinet frame is the control unit compartment, separated by steel partition plates into several small compartments. This design isolates different circuits to prevent the expansion of line faults. The protection class reaches IP40-50, and the maximum current capacity can reach 6300A.

This series of products features high breaking capacity, excellent dynamic and thermal stability, advanced and reasonable structure, practical electrical schemes, strong seriality and universality, and flexible combination of various scheme units. A single cabinet can accommodate multiple circuits, saving floor space. It also has an attractive appearance, high protection class, safety and reliability, and easy maintenance.

The GCK series withdrawable switchgear cabinets comply with GB7251.1 Low-Voltage Switchgear and Controlgear - Part 1: Type-Tested and Partially Type-Tested Assemblies.

■ Design Features

For outgoing line circuits or incoming line circuits with a current exceeding 630A, the switch body should preferably be of withdrawable type or fixed type;

Power feeding circuits can be of withdrawable (drawer-type) or plug-in type, featuring reliable performance, simple structure, and convenient and quick maintenance and replacement;

For motor control circuits, the withdrawable (drawer-type) is mostly used, while fixed installation is more economical and has high reliability.

■ Design Specifications

According to design requirements, 1/2-size drawers can be selected within a 4-modular unit;

In fixed design, components can be installed within a single modular unit;

This cabinet generally adopts rear outgoing lines. If side outgoing lines are required, this can also be implemented (side outgoing lines can be paralleled with rear outgoing lines in cabinet arrangement).

■ Structural Features

The basic cabinet frame of this product series adopts a modular assembled structure. All structural components of the cabinet frame are connected to each other by screw fastening to form a basic frame. Then, parts such as doors, baffles, partitions, drawers, mounting brackets, as well as busbars and electrical components are added as needed to assemble a complete switchgear cabinet. This cabinet has the following features:

The frame is made of special-shaped steel, positioned by connecting plates, and adopts a bolted structure without welding, which eliminates welding deformation and stress and improves installation accuracy.

The mounting holes of the frame and components vary according to the modulus E=25mm.

Internal structural components undergo galvanized treatment. The exterior, after acid pickling and phosphating treatment, is coated with electrostatic epoxy powder.

The drawer unit takes a height of 200mm (i.e., 8E) as the benchmark.

■ Operating Conditions

The altitude of the operating environment shall not exceed 2000m;

The ambient air temperature shall not be higher than +40℃, and the average temperature within 24 hours shall not be higher than +35℃; the minimum ambient air temperature shall not be lower than -5℃;

Atmospheric conditions: Clean air; the relative humidity shall not exceed 50% when the maximum temperature is +40℃, and higher relative humidity is allowed at lower temperatures (e.g., 90% at +20℃);

It shall be used in locations free from fire and explosion hazards, severe pollution, chemical corrosion, and severe vibration;

The inclination angle of the product relative to the vertical plane shall not exceed 5 degrees during installation.

This product is suitable for transportation and storage under the following temperatures: -25℃ to +55℃, and shall not exceed +70℃ for a short period (no more than 24 hours);

If the above operating conditions cannot be met, the user shall propose to the manufacturing company for negotiation and resolution when placing an order.

■Technical Parameters

■ Installation

The following information shall be provided when placing an order:

Number of main wiring, single-level system diagram, arrangement diagram, and layout plan;

The user shall provide the secondary schematic diagram and terminal arrangement diagram. If there is no terminal arrangement diagram, it shall be arranged by the manufacturer;

Model, specification, and quantity of electrical components in the switchgear cabinet;

Summary table of electrical equipment;

When a busbar bridge (busbar bridge between two rows of cabinets and between cabinet and wall) is required, the span and height dimensions shall be provided;

If the switchgear cabinet is used under special environmental conditions, it shall be specified at the time of ordering;

When other or special accessories are required, their type and quantity shall be specified.

■ Main Circuit Scheme

■ Grounding Device of Switchgear Cabinet

Use the provided connection blocks to connect the grounding busbars of each cabinet together.

Connect all leads that require grounding inside the switchgear cabinet.

Connect the base cabinet frame to the grounding bar.

A	B
600	800
600	1000
800	800
800	1000
1000	800
1000	1000

■ Transportation and Storage

The following points shall be noted during the transportation and storage of the switchgear cabinet:

Do not tip over, invert, or subject the cabinet to severe vibration; keep it away from water sources.

Prevent exposure to rain to avoid dampness of the product.

Do not arbitrarily disassemble the product or its components.

■ Ordering Instructions

The following information shall be provided when placing an order:

Main wiring number, single-level system diagram, arrangement diagram, and layout plan;

The user shall provide the secondary schematic diagram and terminal arrangement diagram; if there is no terminal arrangement diagram, it shall be arranged by the manufacturer;

Model, specification, and quantity of electrical components in the switchgear cabinet;

Summary table of electrical equipment;

When a busbar bridge (busbar bridge between two rows of cabinets and between the cabinet and the wall) is required, the span and height dimensions shall be provided;

If the switchgear cabinet is used under special environmental conditions, it shall be specified at the time of ordering;

When other or special accessories are required, their type and quantity shall be specified.