HUARUI 
GCK/GCS/GGD Low Voltage Switchgear Cabinet
Both GCK and GCS are low voltage draw-out type switchgear (drawer-type cabinets), belonging to type-tested assembly switchgear (TTA), widely used in 400V/690V and below low voltage power distribution systems. GCK features simple structure and strong interchangeability, while GCS is a newly self-developed cabinet type adopting rear-mounted horizontal busbars, flame-retardant vertical busbars, and intelligent modules, offering advantages in short-circuit withstand capability and intelligence.
The main framework of the device adopts 8MF steel section steel. The framework is available in two structural forms: assembled and partially welded. The main framework is provided with mounting holes with a module of E = 20mm.
The functional compartments of the device are strictly separated. The compartments are mainly divided into the functional unit compartment and the busbar compartment. The functions of each unit are relatively independent.
The module for drawer height is 160mm. It is divided into five size series: 1/2 unit, 1 unit, 1+1/2 unit, 2 units, and 3 units. The rated current of each circuit in the unit is 400A and below.
Drawers vary only in height dimension; their width and depth dimensions remain unchanged. Drawers with the same functional unit have good interchangeability.
Each MCC cabinet can accommodate up to 11 one-unit drawers or 22 half-unit drawers. Drawers larger than one unit are equipped with multifunctional rear plates.
The drawer front panel has clear indications for positions such as open, closed, test, and withdrawn. Feeder cabinets and motor control cabinets are provided with dedicated cable compartments. The connection between the functional unit compartment and the cable compartment is achieved through adapters or transition copper bars, which improves cable reliability and greatly facilitates cable installation and maintenance for users. The cable compartment is available in two width dimensions (240mm and 440mm), selected according to the number of cables, cross-sectional area, and user requirements for installation and maintenance convenience.
The number of auxiliary contacts for functional units is 32 pairs for units of one unit and above, and 20 pairs for 1/2 unit drawers, meeting the needs of automation users and computer interfaces.
With drawers as the main body, the device offers both draw-out type and fixed type, which can be mixed and combined, selected arbitrarily according to user needs.
The device is designed according to three-phase four-wire and three-phase five-wire systems. Design departments and users can conveniently choose either PEN or PE+N methods.
|
Parameter name |
Unit |
Value |
|
|
Model |
|
GCK/GCS series (customization supported) | |
|
Rated operating frequency |
Hz |
50/60 |
|
|
Rated working voltage |
V |
380(660) |
|
|
Maximum insulation voltage |
V |
660 |
|
|
Rated working current |
Horizontal bus |
A |
630~3150 |
|
Vertical bus |
A |
800 |
|
|
Rated short-time withstand current |
Horizontal bus |
A |
80KA/1s (Effective value) |
|
Vertical bus |
A |
50KA/1s (Effective value) |
|
|
Rated peak withstand current |
Horizontal bus |
A |
176KA |
|
Vertical bus |
A |
110KA |
|
|
Main circuit connector |
A |
200 400 630 |
|
|
Auxiliary circuit connector |
A |
10 |
|
|
1 Power frequency withstand voltage for 1s |
V |
1890 |
|
|
Maximum capacity of control motor |
KW |
155 |
|
|
IP code |
/ |
IP40 |
|
|
Operation mode |
/ |
Local/Remote/Automatic |
|
Enclosure
Made of high-quality cold-rolled steel plate or aluminum-zinc plated steel plate through multiple bending processes, with C-section framework structure. The enclosure is divided into three independent compartments: busbar compartment, equipment compartment (drawer compartment), and cable compartment, separated by steel plates or flame-retardant plastic plates.
Draw-out Unit
Modular draw-out structure with three positions: connected, test, and disconnected. Units of the same specification are interchangeable. A single cabinet can accommodate up to 22 draw-out units (1/2 drawer units). The insertion mechanism has a mechanical life of over 5,000 operations.
Main Busbar System
Horizontal busbars run through and connect all cabinets. For GCK, they are located at the cabinet top; for GCS, they are arranged horizontally at the rear. Busbars are made of high-conductivity copper with silver-plated connections, with a maximum current-carrying capacity of 4000A.
Vertical Busbar
Installed at the rear of the draw-out compartment, distributing power to each draw-out unit. GCS uses flame-retardant plastic functional boards embedded with vertical busbars to enhance insulation protection and prevent fault spread.
Incoming Unit
Includes an air circuit breaker, incoming copper busbars, and current transformers, receiving power from the grid and distributing it to each cabinet. Top or bottom incoming methods are available, with rated current up to 4000A.
Outgoing Unit
Includes molded case circuit breakers, contactors, thermal relays, and other components installed inside the drawer. Used for controlling and protecting load circuits, providing overload, short-circuit, and phase loss protection functions.
Instrument Transformers
Includes current transformers and voltage transformers, installed in the incoming cabinet or outgoing circuits. Used for measuring current and voltage, providing signals for protection devices and metering data.
Intelligent Measurement and Control Devices
Includes smart instruments, motor protectors, PLCs, and communication modules, enabling current, voltage, and power measurement, as well as overload and short-circuit protection, supporting remote monitoring and communication.
Interlocking Mechanism
Includes mechanical interlocking between the drawer handle and positions, preventing insertion or withdrawal under load. Inter-cabinet interlocks prevent misoperation and ensure a safe operating sequence.
Earthing Protection System
Main earthing busbar runs through the entire cabinet, with independent earthing terminals for each draw-out unit. The draw-out unit maintains earthing continuity in all three positions (connected, test, disconnected), ensuring maintenance safety.
Pressure Relief and Protection Devices
Pressure relief channels are provided at the top of the busbar and cable compartments, directing high-pressure gases away during internal faults. The cabinet protection level is up to IP40, with transparent observation windows.
1. Core Product Advantages
High Breaking Capacity: Horizontal busbar current up to 4000A, with short-time withstand current up to 50kA, meeting high-capacity power distribution requirements.
Compartmentalized Cabinet Structure: The busbar compartment, equipment compartment, and cable compartment are mutually isolated, preventing fault spread between compartments for safe and reliable operation.
Rear-Mounted Horizontal Busbar (GCS): Horizontal busbars are arranged horizontally at the rear of the cabinet, enhancing dynamic withstand capability and providing better heat dissipation.
Scalable Intelligence: Can be equipped with smart instruments and communication modules, enabling remote monitoring and energy management, adaptable to intelligent power distribution systems.
2. Service Life
The design service life of GCK/GCS low voltage draw-out type switchgear is 20 to 25 years. The enclosure, made of high-quality steel plate with a C-section framework, can achieve a service life of over 30 years. The draw-out unit insertion mechanism has a mechanical life of more than 5,000 operations. Circuit breakers have a mechanical life of 10,000 to 20,000 operations. Instrument transformers have a service life of 15 to 20 years, while smart instruments have a service life of approximately 10 to 15 years. With standardized maintenance, regular servicing, and timely replacement of components at the end of their life, the overall equipment service life can be extended to over 25 years.
1. Daily Maintenance
Environment and Appearance Inspection: Weekly check whether the cabinet is deformed or rusted, whether there are foreign objects or water accumulation inside the cabinet, and whether the temperature and humidity of the distribution room are within specified ranges.
Operating Parameter Monitoring: Daily observe whether the current and voltage readings of each draw-out unit are normal, whether indicator lights and instruments display correctly, and whether there are any abnormal alarms.
Draw-out Unit Inspection: Monthly check whether the draw-out unit handle is in place, whether the position indication is accurate, whether insertion and withdrawal operations are smooth, and whether units of the same specification interchange properly.
Tightening Inspection: Every six months check whether busbar bolts, incoming/outgoing terminals, and earthing wires are loose, and whether secondary circuit terminals are secure.
Enclosure and Component Cleaning: At least once a year, use a vacuum cleaner or dry compressed air to clean dust inside the cabinet, focusing on busbars, insulation parts, and the interior of draw-out units.
Operating Mechanism Lubrication: Annually apply an appropriate amount of lubricating grease to moving parts such as the draw-out unit insertion mechanism and handles to maintain smooth and flexible operation.
Earthing System Inspection: Every six months check whether the main earthing busbar and earthing terminals of each unit are reliably connected, and that the earthing resistance meets the requirement of ≤4Ω.
Smart Device Inspection: Every six months check whether smart instruments and motor protectors display correctly, whether communication is (uninterrupted), and whether parameter settings have changed.
Preventive Testing: Perform preventive testing every 1 to 3 years, including insulation resistance testing, loop resistance testing, and protection device setting verification.
2. Safety Regulations
Before starting work, the circuit breaker must be opened and the truck must be withdrawn to the test position.
Before entering the cable compartment, voltage must be verified and the earthing switch must be closed.
Hang a "Do Not Close" sign and set up warning barriers around adjacent live cabinets.
Operators must hold valid certificates and wear insulated shoes and insulated gloves.
1. Power Plants: Auxiliary power distribution systems and power centers
2. Substations: Power receiving and distribution
3. Industrial and Mining Enterprises: Industrial power distribution and motor control in petroleum, chemical, metallurgy, textiles, etc.
4. Infrastructure: High-rise buildings and commercial complexes
5. New Energy: Photovoltaic (PV) and energy storage system integration
1. Environmental Risks
1. Moisture and Condensation Risk: High humidity causes condensation on insulation parts inside the cabinet, reducing insulation resistance and easily leading to surface flashover or creepage discharge.
2. Dust Contamination Risk: Conductive dust accumulates on insulators and contact box surfaces, shortening creepage distance and possibly causing short circuits or partial discharge.
3. Corrosive Gas Risk: Corrosive gases in chemical plants and sewage treatment sites corrode metal parts, leading to poor contact due to oxidation of the cabinet and contacts.
4. High-Temperature Overheating Risk: Poor ventilation or excessive ambient temperature causes the temperature rise inside the cabinet to exceed limits, accelerating insulation aging and component damage.
5. Vibration Impact Risk: Proximity to large vibrating equipment may cause fasteners to loosen and the truck position to shift, affecting interlock reliability.
6. Altitude Risk: When altitude exceeds 2000m, the air insulation strength decreases, and insufficient external insulation distance may lead to phase-to-phase or phase-to-ground discharge.
2. Installation Restrictions
1. Moisture and Condensation Risk: High humidity causes condensation on insulation parts inside the cabinet, reducing insulation resistance and easily leading to surface flashover or creepage discharge.
2. Dust Contamination Risk: Conductive dust accumulates on insulators and contact box surfaces, shortening creepage distance and possibly causing short circuits or partial discharge.
3. Corrosive Gas Risk: Corrosive gases in chemical plants and sewage treatment sites corrode metal parts, leading to poor contact due to oxidation of the cabinet and contacts.
4. High-Temperature Overheating Risk: Poor ventilation or excessive ambient temperature causes the temperature rise inside the cabinet to exceed limits, accelerating insulation aging and component damage.
5. Vibration Impact Risk: Proximity to large vibrating equipment may cause fasteners to loosen and the truck position to shift, affecting interlock reliability.
6. Altitude Risk: When altitude exceeds 2000m, the air insulation strength decreases, and insufficient external insulation distance may lead to phase-to-phase or phase-to-ground discharge.
Due to the unique characteristics of the cabinet, the quotation for this product requires certain technical parameters. Full-dimensional personalized customization is also supported. The main ordering instructions are as follows:
1. Complete product model number, including the main circuit scheme number and auxiliary circuit scheme number;
2. Main circuit system combination sequence diagram;
3. Electrical schematic diagram of the auxiliary circuit;
4. List of components inside the cabinet;
5. Setting parameters such as voltage, current, time, etc. in the circuit;
6. Any other special requirements that deviate from the normal operating conditions of the product.
