GCS Low Voltage Withdrawable Switchgear
GCS low voltage withdrawable switchgear is a high-performance power distribution and motor control system developed by GOHO to meet the growing demands of the power market. Designed in full compliance with IEC 61439-1, IEC 61439-2, and GB/T 7251 standards, GCS switchgear combines advanced technical performance with practical operation and maintenance convenience, establishing it as one of the most widely adopted withdrawable low voltage switchgear platforms in China’s power distribution sector.
The GCS series features a withdrawable (draw-out) unit design with advanced multi-finger contact systems utilizing silver-alloy plated contact surfaces, ensuring reliable electrical connection and low contact resistance during repeated draw-out and plug-in operations exceeding 2,000 mechanical cycles. Each drawer unit is equipped with a three-position mechanism — Connected, Test, and Disconnected — with clear mechanical position indication and automatic shutter covering live busbar stabs when the drawer is withdrawn. The GCS series is particularly suited for power stations, large industrial facilities, and key infrastructure projects where supply continuity and operational safety are critical.
Technical Specifications
| Item | Specification |
|---|---|
| Rated Insulation Voltage (Ui) | 660V |
| Rated Working Voltage (Ue) | 380V / 400V / 415V |
| Rated Current (Main Busbar) | Up to 5000A |
| Rated Current (Branch Busbar) | Up to 1200A |
| Rated Frequency | 50Hz / 60Hz |
| Rated Short-time Withstand Current (Icw) | 50kA / 80kA (1s) |
| Rated Peak Withstand Current (Ipk) | 105kA / 176kA |
| Degree of Protection | IP30 / IP40 / IP54 (optional) |
| Drawer Unit Sizes | 1/2 unit, 1 unit, 2 unit, 3 unit |
| Drawer Mechanical Life | ≥ 2,000 operations |
| Drawer Electrical Life | ≥ 500 operations (draw-out under no-load) |
| Busbar Material | High-conductivity T2 electrolytic copper |
| Enclosure Material | Cold-rolled steel / Stainless steel (optional) |
| Surface Treatment | Epoxy powder coating, RAL 7035 |
| Standards | IEC 61439-1, IEC 61439-2, GB/T 7251 |
Key Features
- Advanced Multi-Finger Drawer Contact System: Primary contacts utilize multiple silver-alloy plated copper fingers per phase, providing large contact surface area, low contact resistance (< 50 µΩ per phase), and reliable electrical performance over 2,000+ insertion/extraction cycles — ensuring consistent power transfer without overheating or contact degradation over the equipment lifetime
- High Breaking Capacity: Main busbar system rated up to 80kA short-time withstand current (Icw) with 176kA peak withstand current (Ipk), ensuring safe fault current handling under the most demanding short-circuit conditions in heavy industrial and power generation environments
- Full Interchangeability: All drawer units of the same specification (current rating, unit size, functional configuration) are fully mechanically and electrically interchangeable without modification or adjustment — dramatically simplifying spare parts inventory management and enabling immediate unit replacement during unplanned outages
- Three-Position Draw-Out Mechanism: Clearly defined Connected (primary and secondary contacts fully engaged), Test (primary contacts disconnected, secondary contacts engaged for functional testing), and Disconnected (all contacts separated, drawer removable) positions with visible mechanical position indication and automatic shutter coverage of live busbar connections
- Multi-Level Protection: Comprehensive mechanical interlocks prevent incorrect operations — including preventing drawer withdrawal when in the closed position, preventing circuit breaker closure when the drawer is in an intermediate position, and preventing unintended drawer movement — arc-resistant design features enhance personnel safety during fault events
- Flexible Unit Configuration: Supports a wide range of functional unit types including incoming/outgoing feeder units (air circuit breakers up to 5000A), motor control units (contactors and soft starters), reactive power compensation units (capacitor banks), metering units, and lighting distribution units within a single switchboard assembly
- Efficient Heat Dissipation: Natural ventilation design with optimized busbar and component layout minimizes internal temperature rise — verified by temperature rise type testing in accordance with IEC 61439-1, maintaining component temperatures within specified limits at rated current
Applications
- Thermal power plants and substations — auxiliary power distribution and unit control
- Large industrial facilities — process control and motor control centers (MCC)
- Commercial complexes and high-rise buildings — main LV switchboards
- Data centers — critical power distribution with high reliability requirements
- Mining operations — reliable power supply under harsh environmental conditions
- Infrastructure — airports, hospitals, water treatment, and rail transportation
- Petrochemical and refining — motor control and process power distribution