GGD Fixed Type Low Voltage Switchgear
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What Is GGD Fixed Type Low Voltage Switchgear?
The GGD Fixed Type Low Voltage Switchgear is a widely adopted AC low-voltage distribution equipment designed for power systems with AC 50Hz/60Hz, rated working voltage up to 690V, and rated current up to 3150A (extendable to 4000A with customized configurations). It is primarily used in power plants, substations, industrial and mining enterprises, commercial buildings, and infrastructure projects for electrical energy conversion, distribution, and control of power, lighting, and motor circuits.
As a fixed-type switchgear, the GGD series features permanently mounted components - including air circuit breakers (ACB), moulded case circuit breakers (MCCB), contactors, fuses, and metering devices - installed directly on the busbar system within a metal-enclosed frame. Unlike withdrawable (drawer-type) switchgear such as GCK, GCS, or MNS, the GGD cabinet eliminates draw-out carriages, slide rails, and secondary disconnect contacts. This simplified construction results in a more robust, economical, and reliable solution for applications where frequent unit replacement or hot-swap capability is not required.
The GGD Low Voltage Switchgear was originally developed by the former Ministry of Energy's Electrical Equipment Design Department and has been the most widely used low voltage fixed switchgear model in China for over three decades. Hundreds of thousands of installations are in operation worldwide, making its design mature, field-proven, and well understood by electrical contractors, maintenance personnel, and consulting engineers across the globe.
⚡Max Rated Voltage：690V
🔋Max Rated Current：3150A
💨Short-Circuit Breaking：50kA
🌀Protection Grade：IP30-IP40
Looking for GGD Low Voltage Switchgear for Your Project?
We provide factory-direct GGD switchgear with IEC 61439 compliance. Custom configurations available for GGD1, GGD2, and GGD3 models.
GGD Model Designation Explained
The three-letter code GGD represents a standardized naming convention in the Chinese low-voltage switchgear industry. Each letter carries a specific meaning:
| Letter | Meaning | Description |
|---|---|---|
| G | Cabinet (enclosure type) | Indicates a cabinet-style enclosed switchgear assembly, as opposed to box-type (XL) or other form factors. |
| G | Fixed installation | All internal components are permanently mounted and wired - not withdrawable or drawer-type. This distinguishes GGD from GCK/GCS/MNS. |
| D | Power (electric distribution) | Designates the application field as electric power distribution, as opposed to control (K) or other specialized uses. |
Sub-Models and Breaking Capacity Levels
The GGD series is further divided into three sub-models, each corresponding to a different short-circuit breaking capacity level:
- GGD1 - 15kA short-circuit breaking capacity, rated current up to 1000A. Suited for small to medium distribution systems with lighter loads.
- GGD2 - 30kA short-circuit breaking capacity, rated current up to 1500-1600A. Designed for medium-capacity industrial and commercial applications.
- GGD3 - 50kA short-circuit breaking capacity, rated current up to 3150A. Built for heavy-duty industrial distribution with high fault current requirements.
Additionally, the GGJ series (GGJ1, GGJ2) refers to companion capacitor compensation cabinets designed for reactive power compensation alongside GGD switchgear assemblies, with 4 main circuit schemes and 12 specifications.
Technical Specifications of GGD Low Voltage Distribution Cabinet
The following table presents the complete technical parameters for the GGD Low Voltage Distribution Cabinet across all three sub-models:
| Model | Rated Voltage (V) | Rated Current (A) | Rated Short-Circuit Breaking Current (kA) | Rated Short-Time Withstand Current Icw (kA, 1s) | Rated Peak Withstand Current Ipk (kA) |
|---|---|---|---|---|---|
| GGD1 | 380 / 400 (690) | A: 1000 B: 600 (630) C: 400 |
15 | 15 | 30 |
| GGD2 | 380 / 400 (690) | A: 1500 (1600) B: 1000 C: 600 |
30 | 30 | 63 / 65 |
| GGD3 | 380 / 400 (690) | A: 3150 B: 2500 C: 2000 |
50 | 50 | 105 |
General Electrical Parameters
| Parameter | Specification |
|---|---|
| Rated Insulation Voltage (Ui) | 660V / 690V |
| Rated Working Voltage (Ue) | 380V / 400V / 415V |
| Rated Frequency | 50Hz / 60Hz |
| Max Rated Current (Main Busbar) | Up to 3150A (4000A customizable) |
| Rated Current (Neutral Busbar) | Up to 1600A |
| Protection Grade | IP30 (standard), IP20–IP40 (optional) |
| Installation Type | Fixed mounting, indoor |
| Enclosure Material | Cold-rolled steel / Al-Zinc coated steel, epoxy powder coated |
| Busbar Material | High-conductivity T2 electrolytic copper / aluminum |
| Main Switching Device | ACB or MCCB |
| Cable Entry | Bottom entry (standard) / Top entry (optional) |
| Cabinet Dimensions (W×D×H) | (400–800) × (600–1000) × 2200mm |
| Compliance Standards | IEC 61439-1/2, GB/T 7251.1 |
Main Circuit Schemes
The GGD cabinet main circuit is designed with 129 schemes comprising 298 specifications (excluding auxiliary circuit functions and control voltage variations):
- GGD1: 49 schemes, 123 specifications
- GGD2: 53 schemes, 107 specifications
- GGD3: 27 schemes, 68 specifications
- GGJ (compensation): 4 schemes, 12 specifications
This extensive scheme library provides rated current up to 3150A, suitable for distribution transformers up to 2000kVA.
Not Sure Which GGD Model Fits Your Requirements?
Our engineers can help you select the right GGD1, GGD2, or GGD3 configuration based on your system's short-circuit capacity and load profile.
Structural Features of GGD Fixed Switchgear
The GGD Fixed Switchgear incorporates several design innovations that enhance reliability, manufacturability, and operational safety:
1. Universal Cabinet Framework
The frame is assembled from 8MF or C-type cold-formed steel sections through localized welding, ensuring high mechanical strength and rigidity. Components are designed on a modular principle with 20mm-pitch mounting holes, yielding a high universality coefficient that enables factory pre-production and shortened manufacturing cycles.
2. Optimized Thermal Management
Heat dissipation slots of varying quantities are installed at both the upper and lower ends of the cabinet. When internal electrical components generate heat, warm air rises and exhausts through the top slots while cool air is drawn in from the bottom slots, forming a natural ventilation path that effectively manages internal temperature.
3. Golden Ratio Aesthetic Design
The cabinet outline and panel dimensions follow the golden mean ratio, giving the entire enclosure an aesthetically pleasing and well-proportioned appearance suitable for modern industrial environments.
4. Sealed Door with Rubber Edge Protection
The cabinet door connects to the framework via rotary-axis movable hinges for convenient installation and disassembly. A mountain-type rubber strip is set in the door's edge fold, providing a compression stroke when closing that prevents direct impact on the cabinet and improves the protection grade.
5. Complete Earthing Protection Circuit
The instrument door with electrical components is connected to the framework via multi-strand soft copper wire. Internal mounting pieces connect to the framework through knurled screws, forming a complete and reliable earthing protection system throughout the cabinet.
6. Removable Top Cover
The top cover can be removed during installation and on-site adjustment of the main busbar. Four lifting rings at the cabinet corners facilitate hoisting and transportation.
7. ZMJ-Type Busbar Clamps
Specially designed ZMJ-type busbar clamps are manufactured from high-strength, high-flame-retardant PPO alloy material using thermoplastic molding. They offer high insulation strength, self-extinguishing performance, and a modular design that easily combines into single or double busbar configurations.
8. Optional Surface Treatment
The enclosure uses an orange-peel polyester topcoat paint with strong adhesion and a sub-light tone to avoid glare, creating a comfortable visual environment for operating personnel. Al-Zinc coated steel sheet options are available for enhanced corrosion resistance.
Extended Comparison: All Common LV Switchgear Types
| Model | Structural Type | Max Rated Current | Key Characteristic | Best Suited For |
|---|---|---|---|---|
| GGD | Fixed | 3150A | Low cost, simple maintenance, proven reliability | Small to medium distribution systems with stable loads |
| XL-21 | Fixed (wall-mounted) | ~630A | Compact wall-mounted, terminal distribution | Floor-level and small-scale distribution |
| GCK | Withdrawable | 4000A | Interchangeable drawers, easy maintenance | Large distribution rooms, frequent operations |
| GCS | Withdrawable | 4000A | High modularity, IP54 option available | High continuous power supply requirements |
| MNS | Withdrawable | 5000A | Compact, ABB international standard, intelligent integration | Large-scale industries, data centers |
For small to medium-sized projects where cost-efficiency, proven reliability, and straightforward maintenance are priorities, the GGD Low Voltage Switchboard remains the first choice. Projects requiring high reliability and uninterrupted power maintenance often opt for drawer-type alternatives.
Applications of GGD LV Switchgear Assembly
The GGD LV Switchgear Assembly serves as core distribution equipment across a wide range of industries and facility types:
Power Generation & Distribution
- Power plant auxiliary power systems - low-voltage auxiliary power distribution
- Substation low voltage distribution - power receiving and distribution
- Section switching and feeder cabinet applications
Industrial & Manufacturing
- Factory workshop power supply - machine power and lighting distribution
- Industrial and mining enterprises' distribution rooms - main or sub-distribution cabinets
- Motor starting and control circuits
- Reactive power compensation with companion GGJ capacitor cabinets
Commercial & Building Infrastructure
- Commercial and high-rise building main LV switchboards
- Civil building substations - power distribution to lighting, air conditioning, and elevators on floors
- Building services - elevator power, fire pump power, and emergency power supply
Municipal & Infrastructure Projects
- Water supply and treatment facilities
- HVAC systems
- Municipal power distribution networks
- Industrial and public lighting distribution systems
Specialized Industrial Sectors
- Petrochemical and chemical plants
- Metallurgical and steel facilities
- Mining operations and heavy industry
- Data center auxiliary power distribution (small to medium facilities)
Due to its economical design and proven reliability, the GGD Low Voltage Switchgear is the preferred choice for small to medium-sized projects, stable load applications, and scenarios where the highest priority is cost-efficiency combined with decades of field-proven performance.
Installation and Operating Conditions for GGD Fixed Type Power Distribution Cabinet
To ensure safe and reliable long-term operation, the GGD Fixed Type Power Distribution Cabinet must be installed and operated within the following environmental parameters:
| Parameter | Requirement |
|---|---|
| Ambient Air Temperature | −5°C to +40°C (average over 24h not exceeding +35°C; some models rated −30°C to +50°C) |
| Altitude | ≤ 2000m above sea level (some models rated up to 2500m) |
| Relative Humidity | ≤ 50% at +40°C; higher humidity allowed at lower temperatures (e.g., 90% at +20°C); condensation possible with temperature changes |
| Installation Gradient | Not exceeding 5° from vertical |
| Vibration & Shock | Installed in locations without severe vibration or impact |
| Environmental Conditions | No fire or explosion hazard, no serious pollution, no chemical corrosion, no severe vibration |
| Installation Type | Indoor, not-against-wall installation, front operation, double-side maintenance |
| Protection Grade | IP30 (standard), user can select IP20–IP40 per environmental requirements |
Ready to Get Started?
Contact us today for a free consultation and customized quotation. Our switchgear engineers are standing by to help you specify the perfect GGD solution for your application.
FAQ
What is the difference between GGD and GCK, GCS, MNS switchgear?
GGD is a fixed-type switchgear where all components are permanently mounted inside the cabinet, requiring power shutdown for maintenance. GCK, GCS, and MNS are withdrawable (drawer-type) switchgear where individual circuit units can be pulled out for hot-swap maintenance without system-wide shutdown. GGD offers lower cost (20–40% savings) and simpler maintenance, while drawer types provide higher flexibility, circuit density, and operational continuity.
What is the rated current and short-circuit capacity of GGD switchgear?
GGD switchgear is available in three sub-models: GGD1 (rated current up to 1000A, 15kA short-circuit breaking capacity), GGD2 (up to 1500–1600A, 30kA), and GGD3 (up to 3150A, 50kA). The rated short-time withstand current ranges from 15kA to 50kA (1s), and peak withstand current from 30kA to 105kA.
What standards does GGD low voltage switchgear comply with?
GGD switchgear complies with IEC 61439-1 and IEC 61439-2 (formerly IEC 60439), GB/T 7251.1 (Low-voltage Switchgear and Controlgear Assemblies), and the typical design requirements of the State Grid Corporation of China. It is widely certified for use in power, petrochemical, metallurgy, and construction sectors.
Can GGD switchgear be used outdoors?
No. The standard GGD switchgear is designed for indoor installation only. It must be installed in a location without fire/explosion hazards, serious pollution, chemical corrosion, or severe vibration. For harsh or outdoor environments, specialized enclosures with upgraded protection grades (IP40+) and anti-corrosion treatments are required.
What is the protection grade of GGD switchgear?
The standard protection grade is IP30, which protects against solid foreign objects larger than 2.5mm. Depending on environmental requirements, users can select protection grades ranging from IP20 to IP40. Higher protection levels are available with enhanced sealing and gasket options.
What is the maximum transformer capacity suitable for GGD switchgear?
GGD switchgear with rated current up to 3150A is suitable for distribution transformers up to 2000kVA. With customized configurations, the rated current can be extended to 4000A, accommodating larger transformer capacities.
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