GCK Low Voltage Withdrawable Switchgear
GCK low voltage withdrawable switchgear is a compact and cost-effective power distribution solution suitable for AC 50Hz/60Hz systems with rated working voltage up to 380V/400V/415V. Manufactured by GOHO to IEC 61439-1 and IEC 61439-2 standards, GCK switchgear is widely applied in power plants, substations, industrial and mining enterprises, and high-rise buildings for power receiving, distribution, reactive power compensation, lighting, and motor centralized control.
The GCK series adopts a withdrawable (draw-out) drawer unit design combined with a fixed busbar system, offering the maintenance convenience of withdrawable functionality at a lower cost point than fully withdrawable alternatives such as MNS or GCS series. Each drawer unit features a three-position mechanism (Connected, Test, Disconnected) with mechanical interlocks and automatic shutter coverage of live busbar contacts upon drawer removal. The compact enclosure design minimizes floor space requirements while maintaining full IEC 61439 compliance for safety and performance.
Technical Specifications
| Item | Specification |
|---|---|
| Rated Insulation Voltage (Ui) | 660V |
| Rated Working Voltage (Ue) | 380V / 400V / 415V |
| Rated Current (Main Busbar) | Up to 3150A |
| Rated Current (Branch Busbar) | Up to 630A |
| Rated Frequency | 50Hz / 60Hz |
| Rated Short-time Withstand Current (Icw) | 50kA (1s) |
| Rated Peak Withstand Current (Ipk) | 105kA |
| Degree of Protection | IP30 / IP40 |
| Drawer Unit Types | 1/2 unit, 1 unit, 2 unit |
| Drawer Mechanical Life | ≥ 2,000 operations |
| Busbar Material | High-conductivity T2 electrolytic copper |
| Enclosure Material | Cold-rolled steel with epoxy powder coating |
| Standards | IEC 61439-1, IEC 61439-2 |
Key Features
- Compact Design: Occupies minimal floor space while delivering full power distribution and motor control functionality — the compact enclosure dimensions make it particularly suitable for space-constrained installation environments such as high-rise building electrical rooms, existing substation retrofits, and prefabricated substation integration where available floor area is limited
- Cost-Effective Withdrawable Configuration: Combines the maintenance convenience of withdrawable drawer units with a simplified busbar and mechanical design that reduces initial capital expenditure compared to fully withdrawable alternatives, making it the ideal choice for budget-conscious projects that still require the operational flexibility of drawer-type functional units
- Reliable Drawer Mechanism: Smooth draw-out operation with clearly defined Connected, Test, and Disconnected positions — mechanical interlocks prevent incorrect operations and automatic shutters cover live busbar stabs when the drawer is removed, ensuring complete operator safety during maintenance and inspection
- Modular Construction: Standardized drawer unit sizes and busbar interfaces enable easy system expansion or reconfiguration as project requirements evolve — additional drawer units can be installed in existing compartments without modifying the busbar system or adjacent functional units
- Comprehensive Protection: Short circuit, overload, undervoltage, overvoltage, and phase failure protection built into standard configuration through microprocessor-based protection relays or electronic trip units integrated within the drawer units
- Natural Ventilation Design: Optimized enclosure ventilation with top and bottom air exchange ensures effective heat dissipation without forced cooling, maintaining internal component temperatures within rated limits under continuous full-load operation
- Versatile Application Coverage: Supports incoming feeder units, outgoing feeder units, motor control units (direct-on-line, star-delta, soft start), reactive power compensation units, lighting distribution units, and metering units within a single switchboard assembly
Applications
- Power plant auxiliary power distribution systems
- Substation low voltage distribution panels
- Industrial factory power distribution and motor control centers
- High-rise building electrical rooms — main and sub-main switchboards
- Commercial centers, hotels, and large retail complexes
- Mining and metallurgy facility power distribution
- Infrastructure — water treatment plants, transportation hubs, hospitals