GCS Low Voltage Draw-Out Switchgear (up to 4000A)
RAYDAFON GCS draw-out switchgear delivers up to 4000A main busbar with 50kA/1s short-time withstand (105kA peak) per GB7251. Each functional unit is mounted in a withdrawable drawer — Connected / Test / Disconnected positions allow safe maintenance without busbar shutdown. Motor control from 0.5kW to 155kW. Separated busbar, cable, and functional unit compartments with 8MF steel frame. Ideal for power plants, substations, petrochemical plants, and high-rise buildings.
What Is GCS Low Voltage Draw-Out Switchgear?
GCS is a low voltage draw-out (withdrawable) switchgear system designed for power distribution and motor control centers in power plants, substations, petrochemical plants, factories, mining enterprises, hotels, and high-rise buildings. Unlike fixed-mount designs, each functional unit in GCS is mounted in a withdrawable drawer with three defined positions — Connected, Test, and Disconnected. This allows a faulty breaker or motor starter to be swapped in minutes without disconnecting the main busbar, dramatically reducing downtime and improving operator safety. The system is rated up to 4000A main busbar with 50kA/1s short-time withstand per GB7251.1.
Draw-Out (Withdrawable) Up to 4000A 50kA / 1s Withstand 0.5–155 kW Motor Control
The Three Drawer Positions
Drawer Position Matrix — Where the Functional Unit Sits
POS 01
Connected
Main circuit and control circuit both live. The breaker is fully inserted and closed. Normal operating state.
POS 02
Test
Main circuit isolated, control circuit still live. Used to test trip/close operation, interlock logic, and auxiliary signals safely.
POS 03
Disconnected
Both circuits isolated, drawer fully withdrawn. The unit is ready for removal or replacement without busbar shutdown.
The three-position drawer allows a spare functional unit of the same rating to be swapped in during routine maintenance or emergency replacement — minimizing production downtime without touching the main busbar.
Drawer Operation Workflow
From Fault Detection to Full Restoration
STEP 01 Fault Alarm
STEP 02 Open Breaker
STEP 03 Drawer to Test
STEP 04 Swap Unit
STEP 05 Return to Service
Three Separated Compartments
Isolated Zones for Fault Containment
Functional Unit Room
Houses the withdrawable drawer — breaker, motor starter, or capacitor bank. Fully isolated from other functional units, allowing individual unit service without affecting adjacent circuits.
Busbar Room
Separately compartmentalized from functional units and cables. Unlike traditional designs that place the horizontal main busbar on top of the cabinet, GCS provides outlet channels both above and below the cable room for flexible routing.
Cable Room
Dedicated space for incoming and outgoing cable termination. The compartmentalized design prevents fault propagation between the cable terminations and the live busbar.
Electrical Ratings
GCS Busbar and Withstand Grades
Horizontal BusbarMain
1600 / 2500 / 4000 A
Vertical BusbarDistribution
800 / 1000 A
Main Circuit ConnectorDrawer plug
100–630 A
Short-Time Withstand1 second RMS
15 / 30 / 50 kA
Peak WithstandPeak value
30 / 63 / 105 kA
Dielectric Strength1 minute
1890 V
Motor Control Capacity Range
Drawer-Level Motor Starter Capacity
Each withdrawable motor control drawer supports direct-on-line (DOL), star-delta, soft-start, and variable-frequency drive (VFD) configurations. Capacitor-compensated drawers are also available for load-side power factor correction.
Key Performance at a Glance
GCS — Core Ratings
4000AMax Horizontal Busbar
155kWMax Motor Starter Capacity
50kAMax Short-Time Withstand / 1s
105kAMax Peak Withstand
Structural Design Advantages
8MF Steel Frame with E=20mm Module Holes
The main structure uses 8MF cold-formed steel with standard E=20mm mounting module holes, allowing functional units to be repositioned or added without redesign. The combined partial weld + partial assembly approach ensures both structural rigidity and field flexibility.
Independent Functional Rooms
Each functional unit occupies its own compartment. Fault propagation between adjacent units is prevented by metal partitions — a faulty drawer can be isolated and swapped without touching neighboring live circuits.
Non-Traditional Busbar Layout
Unlike conventional designs that place the horizontal main busbar on top of the cabinet, GCS routes the horizontal busbar through the middle of the cabinet. This creates outlet channels both above and below the cable room, giving engineers far more flexibility in cable routing.
High Breaking Capacity & Dynamic Stability
High breaking and closing capacity, good dynamic stability, and flexible electrical schemes make GCS suitable as a replacement product for existing withdrawable switchgear while meeting power market expansion, computer interface, and centralized power control needs.
Reduced Accident Handling Time
The drawer mechanism reduces accident handling time by allowing rapid unit replacement — spare drawers of the same rating can be kept on site and inserted without busbar shutdown. Ideal for facilities where uptime is critical.
Novel Structure & High Protection
Novel structural design with high protection level, convenient combination, and strong practicality. Designed according to the requirements of power industry authorities and design departments for safe, economic, rational, and reliable operation.
Industry Applications
- Power Plants — Auxiliary power distribution and motor control centers for large single-unit capacity power plants. The draw-out design minimizes downtime during routine breaker maintenance.
- Substations — LV main distribution boards downstream of the distribution transformer. Fixed-mount alternative available as GGD fixed switchgear →
- Petrochemical Plants — Motor control centers for pumps, compressors, and process equipment. GCS handles the large-scale petrochemical industry's need for centralized power control and computer interface. See LV switchgear range →
- Factories & Manufacturing — Main and sub-distribution for automotive, chemical, steel, cement, and general manufacturing. Motor control up to 155kW per drawer covers most industrial loads.
- Mining Enterprises — Rugged cabinet construction suited to dusty, high-temperature mining environments. Draw-out design simplifies maintenance in remote locations.
- Hotels & High-Rise Buildings — Power distribution for commercial towers, hotels, and shopping malls. Draw-out units reduce disruption during tenant-side maintenance.
- Replacement / Retrofit Projects — Designed as a replacement product for existing low voltage withdrawable switchgear while maintaining existing busbar positions and cable entries. See draw-out switchgear range →
- Prefabricated Substation Integration — Fits into RAYDAFON YBM prefabricated substations. See prefabricated substations →
Why Choose RAYDAFON as Your GCS Switchgear Manufacturer
- 20+ Years of Power Equipment Experience — RAYDAFON Technology Group has served the electrical equipment industry for over two decades, with products deployed across 40+ export countries.
- 8MF Steel Frame Precision — Main structural components are produced on CNC production lines with E=20mm module mounting holes for accurate, repeatable functional unit positioning.
- Complete Drawer Portfolio — Breaker drawers, motor starter drawers (DOL / Y-Δ / Soft / VFD), capacitor drawers, and PT/metering drawers all share the same drawer platform. Spare drawers of the same rating can be swapped in without busbar shutdown.
- GB7251 Compliant Manufacturing — All products manufactured under ISO/IEC quality management systems and tested to GB7251.1, with type-test reports available on request.
- Integrated Switchgear & Substation Manufacturing — We also manufacture MV switchgear, RMUs, fixed-mount GGD switchgear, and prefabricated substations. GCS integrates seamlessly into complete RAYDAFON turnkey distribution projects.
- Full Documentation & After-Sales — Installation drawings, P&ID diagrams, and component authenticity records ship with every unit. Engineering support responds within 24 hours.
Frequently Asked Questions
What is GCS low voltage draw-out switchgear?
GCS is a low voltage withdrawable switchgear system used for power distribution and motor control centers in power plants, substations, petrochemical plants, factories, mining enterprises, hotels, and high-rise buildings. Each functional unit (breaker, motor starter, or capacitor) is mounted in a draw-out drawer that can be pulled out for maintenance or replacement without disconnecting the main busbar — dramatically reducing downtime and improving operator safety.
What does 'draw-out' or 'withdrawable' mean?
Draw-out (withdrawable) means each functional unit is mounted in a removable drawer that has three positions: Connected (fully inserted, main circuit live), Test (control circuit live, main circuit isolated), and Disconnected (fully withdrawn). This allows a faulty breaker or starter to be swapped in minutes without busbar shutdown — the operator inserts a spare unit of the same rating and returns the drawer to the Connected position.
What are the rated current and short-circuit withstand of GCS?
The GCS horizontal main busbar is rated up to 4000A (standard 1600A and 2500A options), with vertical distribution busbar at 800A or 1000A. Short-time withstand current is available in 15kA, 30kA, and 50kA grades at 1 second; peak withstand current is 30kA, 63kA, and 105kA respectively. Main circuit connectors support 100–630A. Dielectric strength is 1890V for 1 minute.
What is the motor control capacity?
The GCS is designed as both a power distribution center and a motor control center. Motor control capacity ranges from 0.5kW to 155kW per drawer, covering direct-on-line, star-delta, soft-start, and variable-frequency drive starters. Capacitor-compensated motor control drawers are also available for installations that require power factor correction at the load side.
What is the delivery time and MOQ?
Standard GCS configurations ship within 35-55 days from order confirmation. MOQ is 1 unit. Custom busbar ratings, protection schemes, or integrated communication may require 60-75 days. We accept sample orders for validation testing.
How does GCS differ from fixed-mount GGD switchgear?
GCS uses withdrawable drawers — functional units can be removed and replaced without busbar shutdown. GGD uses fixed-mount design — simpler, lower cost, but requires busbar isolation for breaker replacement. Choose GCS for high-availability plants with frequent maintenance or rapid-swap requirements; choose GGD for cost-sensitive installations with stable load profiles. See GGD fixed switchgear →
Related Equipment
For a complete power distribution solution, pair GCS with:
- GGD Low Voltage Fixed Switchgear — For cost-effective fixed-mount sub-distribution
- MNS Draw-Out Switchgear — Higher-capacity 6300A draw-out platform
- YBM Prefabricated Substations — Containerized substations with factory-integrated GCS cabinets
- Remote-9001 Monitoring Unit — For smart monitoring and SCADA integration
- Medium Voltage Switchgear — For upstream MV distribution from the transformer
Draw-out functional units with 3-position drawer
Up to 4000A main busbar
50kA / 1s short-time withstand
105kA peak withstand
0.5–155kW motor control capacity
8MF steel frame with E=20mm module holes
Ready to Specify Your GCS Draw-Out Switchgear?
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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