GGD Low Voltage Fixed Switchgear
RAYDAFON GGD low voltage fixed switchgear delivers up to 3150A rated current and 50kA/1s short-circuit withstand (105kA peak) in a robust 8MF cold-formed steel cabinet. Three models — GGD1 / GGD2 / GGD3 — cover 1000A to 3150A for AC 50Hz distribution systems at 380V. Natural bottom-to-top ventilation, rotary movable door hinges, and GB7251-compliant construction. Ideal for power plants, substations, mining, and industrial distribution.
What Is GGD Low Voltage Fixed Switchgear?
GGD is a type of AC low voltage fixed distribution cabinet used in power plants, substations, mining enterprises, and industrial facilities. It operates on AC 50Hz with 380V rated working voltage and rated current up to 3150A, serving power conversion, distribution, and control of power, lighting, and distribution equipment. Unlike draw-out switchgear where functional units are removable, GGD uses a fixed mounting design — every breaker, contactor, and meter is bolted to the frame. This simple architecture delivers high short-circuit withstand, low maintenance, and long-term reliability for main distribution boards, incoming feeders, and reactive compensation cabinets.
Up to 3150A 50kA / 1s Withstand Natural Ventilation GB7251 Compliant
Three Capacity Grades — GGD1 / GGD2 / GGD3
Capacity Ladder
Three capacity grades share the same platform. GGD1 handles small distribution systems; GGD2 covers medium industrial loads; GGD3 delivers high-capacity main distribution. The cabinet dimensions, busbar cross-section, and short-circuit withstand scale with the model — pick the grade that matches your incoming transformer capacity and load profile.
Model Comparison at a Glance
GGD1
Small Distribution Systems
Rated current (A)400–1000
Short-time (kA/1s)15
Peak (kA)30
Breaking (kA)15
Best for: Lighting distribution, small workshop power, auxiliary circuits in commercial buildings.
GGD2
Medium Industrial Loads
Rated current (A)1000–1600
Short-time (kA/1s)30
Peak (kA)63
Breaking (kA)30
Best for: Plant sub-distribution boards, large motor control panels, industrial workshop mains.
GGD3
Main Distribution Boards
Rated current (A)2000–3150
Short-time (kA/1s)50
Peak (kA)105
Breaking (kA)50
Best for: Main incoming feeders, substation LV main boards, high-capacity industrial distribution.
Inside the GGD Cabinet
Fixed-Mount Architecture with Rotary Door Hinges
GGD CABINET
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8MF Cold-Formed Steel Frame
Partially welded and assembled framework. Special supporting parts supplied by designated steel factories for precision and quality consistency.
Natural Ventilation Path
Heat dissipation slots at top and bottom create a continuous bottom-to-top airflow, eliminating the need for forced-air fans.
Rotary Door Hinge
Doors attach to the frame with rotary movable hinges for quick install/removal. Mountain-shaped rubber seal protects against direct impact and improves ingress protection.
Fixed-Mount Internals
Breakers, contactors, and meters are bolted directly to the frame — simpler than draw-out design, with fewer moving parts and lower maintenance cost.
Natural Convection Ventilation
Bottom-to-Top Airflow — No Fans Required
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Cool Air Inlet Bottom Slots
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Components Heat Breakers · Contactors
↑
Warm Air Rises Convection
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Hot Air Outlet Top Slots
Passive convection maintains safe internal temperatures without consuming energy or requiring periodic fan maintenance.
Three Structural Design Principles
8MF Cold-Formed Steel Frame
The framework uses 8MF cold-formed steel, partially welded and partially assembled. Special supporting parts are supplied by designated steel production factories to ensure dimensional accuracy and quality consistency across every unit. The universal cabinet design simplifies production and shortens lead time.
Natural Bottom-to-Top Ventilation
Heat dissipation slots at both the top and bottom of the cabinet create a continuous airflow path. Warm air from operating components rises and exits through the upper slots while cool air is drawn in through the lower slots, forming a self-sustaining convection channel without fans or filters.
Rotary Movable Door Hinge
The cabinet door connects to the frame with rotary movable hinges, making installation and disassembly easy. A mountain-shaped rubber strip is embedded in the door's folding edge — when closed, it compresses slightly between door and frame, preventing direct metal-to-metal collision and improving the door's ingress protection level.
Technical Specifications
GGD Series — Core Ratings
380VRated Working Voltage
50HzRated Frequency
3150AMax Rated Current (GGD3)
50kAMax Short-Circuit Breaking
50kAMax Short-Time Withstand / 1s
105kAMax Peak Withstand
8MFFrame Material
GB7251Reference Standard
| Model | Rated Current (A) |
Breaking (kA) |
Withstand (kA/1s) |
Peak (kA) |
||
|---|---|---|---|---|---|---|
| A | B | C | ||||
| GGD1 | 1000 | 600(630) | 400 | 15 | 15 | 30 |
| GGD2 | 1500(1600) | 1000 | — | 30 | 30 | 63 |
| GGD3 | 3150 | 2500 | 2000 | 50 | 50 | 105 |
Rated current sub-grades A / B / C represent different busbar and breaker configurations within the same model. Contact RAYDAFON engineering for a load-profile-matched configuration.
Industry Applications
- Power Plants — Auxiliary power distribution for thermal, hydro, and renewable power plants. GGD3 handles main incoming feeder duty while GGD1 covers auxiliary and lighting circuits.
- Substations — LV main distribution boards downstream of the distribution transformer. Fixed-mount construction reduces maintenance and increases reliability in unmanned substations. See prefabricated substations →
- Mining Enterprises — Rugged cabinet construction and natural ventilation suit dusty, high-temperature mining environments where forced-air cooling would require frequent filter maintenance.
- Industrial Manufacturing Plants — Main and sub-distribution for automotive, chemical, steel, cement, and textile plants. GGD2 and GGD3 handle motor control and heavy load switching. See LV switchgear range →
- Commercial Buildings & Hospitals — Lighting and power distribution for office towers, shopping malls, and healthcare facilities. GGD1 provides cost-effective compact distribution.
- Water Treatment Plants — Pump control and distribution for municipal water and wastewater facilities.
- OEM Panel Builders — Licensed GGD supply for panel builders that require GB7251-compliant fixed-mount distribution cabinets for system integration projects.
- Retrofit & Upgrade Projects — Replacement of legacy fixed-mount LV cabinets while maintaining existing busbar positions and cable entry layouts. See fixed switchgear range →
Why Choose RAYDAFON as Your GGD 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 Cold-Formed Steel Precision — Framework components and special supporting parts are supplied by designated steel factories, ensuring dimensional accuracy across every unit and enabling mass-production consistency.
- Universal Cabinet Platform — The GGD cabinet body uses a universal cabinet form with modular internal mounting positions. Custom protection schemes, breaker brands, and metering configurations can be accommodated on the same frame.
- 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, and prefabricated substations. GGD 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 GGD low voltage fixed switchgear?
GGD is a type of AC low voltage fixed distribution cabinet used in power plants, substations, mining enterprises, and industrial facilities. It operates on AC 50Hz with rated working voltage 380V and rated current up to 3150A. The GGD cabinet is designed for power conversion, distribution, and control of power, lighting, and distribution equipment. Unlike draw-out switchgear, all functional units in GGD are fixed in position — the design emphasizes structural simplicity, high short-circuit withstand, and low maintenance.
What are the differences between GGD1, GGD2, and GGD3?
GGD1, GGD2, and GGD3 are three capacity grades of the same GGD platform. GGD1 is rated up to 1000A with 15kA short-circuit withstand and 30kA peak — suitable for small distribution systems. GGD2 is rated up to 1500(1600)A with 30kA withstand and 63kA peak — for medium industrial loads. GGD3 is rated up to 3150A with 50kA withstand and 105kA peak — for main distribution boards in large plants and high-capacity substations. The cabinet dimensions, busbar cross-section, and breaker rating scale with the model.
How does natural ventilation work in the GGD cabinet?
The GGD cabinet uses a passive natural convection design. Heat dissipation slots are distributed at both the top and bottom of the cabinet. As electrical components inside heat up, the warm air rises and exits through the upper slots. Cool air is continuously drawn in through the lower slots, creating a continuous bottom-to-top airflow. This eliminates the need for forced-air fans while maintaining safe internal temperatures, reducing both energy consumption and maintenance.
What is the maximum rated current and short-circuit withstand?
The GGD series covers up to 3150A rated current (GGD3 model) with 50kA/1s short-time withstand current and 105kA peak withstand current. This is sufficient for most industrial low voltage distribution applications, including main incoming feeders in large factories and substations. For higher ratings up to 6300A, consider our Cooper Edison LSN or Schneider BlokSet 5000 switchgear platforms.
What is the delivery time and MOQ?
Standard GGD configurations ship within 30-50 days from order confirmation. MOQ is 1 unit. Custom busbar ratings, protection schemes, or communication integration may require 50-70 days. We accept sample orders for validation testing.
Can GGD integrate with higher-capacity switchgear?
Yes. GGD is often deployed as a sub-distribution layer downstream of larger LV main boards. RAYDAFON manufactures a complete range of LV switchgear — including GGD fixed, Cooper Edison LSN drawer, and Schneider BlokSet 5000 — so mixed systems can be supplied from one factory with coordinated protection and busbar interfaces. See full LV switchgear range →
Related Equipment
For a complete power distribution solution, pair GGD with:
- Cooper Edison LSN LV Switchgear — For higher-capacity 6300A drawer-type main distribution
- Schneider BlokSet 5000 LV Switchgear — Alternative branded LV switchgear platform
- Draw-Out Switchgear — For applications requiring drawer-type removable functional units
- YBM Prefabricated Substations — Containerized substations with factory-integrated GGD cabinets
- Remote-9001 Monitoring Unit — For smart monitoring and SCADA integration
Up to 3150A rated current
50kA / 1s short-time withstand
105kA peak withstand current
8MF cold-formed steel frame
Natural bottom-to-top ventilation
GB7251.1 compliant
Ready to Specify Your GGD Switchgear?
Share your transformer capacity, load profile, and required short-circuit withstand — our engineers will reply with a tailored GGD1/2/3 configuration and factory-direct quote within 24 hours.
Request Quote NowSee full fixed switchgear range →
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