GGD AC Low-Voltage Distribution Cabinet
Overview
The GGD series AC low-voltage distribution cabinet is a fixed-mounted low-voltage switchgear assembly compliant with standards IEC 60439 and GB 7251.1. Its core advantages are simple and robust structure, durability, and convenient maintenance. It is widely applicable in power conversion, distribution, and control for power, lighting, and distribution equipment in 400V and below distribution systems for industrial and mining enterprises, commercial buildings, infrastructure, etc. It is an ideal choice for replacing old distribution cabinets.
Brief Introduction
Ⅰ.Distribution introduction
1.Rated Voltage: 400V
2.Rated Current: Main Busbar ≤ 4000A, Branch Circuit ≤ 630A
3.Applicable Standards: CCC, GB 7251.1, IEC 61439-1
4.Protection Degree: IP30 (Basic Indoor Type)
Ⅱ.Applicable Conditions and Scope
1. The ambient air temperature should not exceed +40°C and should not be lower than -5°C. The average temperature within 24 hours should not exceed +35°C;
2.For indoor installation, the altitude at the point of use must not exceed 2000m;
3.The relative humidity of the surrounding air should not exceed 50% at the maximum temperature of +40°C, and a higher relative humidity should be allowable at lower temperatures (e.g., 90% at +20°C), taking into account the possible occasional effects of condensation due to temperature changes;
4.Special requirements can be resolved through consultation with the manufacturer.
Ⅲ.Component Inspection
1. Steel plate thickness ≥ 2.0mm (measured error ± 0.1mm)
2.100% verification of component factory certificates
3.Busbar tin plating thickness ≥ 5μm
4.Cabinet diagonal deviation ≤ 3mm
5.Door panel open/close test ≥ 500 cycles without deformation
Product Features
Ⅰ.Feature Introduction
1.Frame Structure: Uses partially welded 8MF sections assembly, ensuring a stable and reliable frame structure
2.Protection Degree: Overall protection degree IP30, internal compartment isolation
3.Installation Method: Can be installed against the wall, doors open front and rear, convenient for operation and maintenance
4.Zonal Isolation: Functional unit compartments are isolated from each other, improving safety
5.Grounding System: Equipped with a dedicated grounding protection system
6.Protective Measures: Live parts are protected with corresponding protective covers
Ⅱ.Product Advantages
1.High Strength: Stable frame structure, strong load-bearing capacity
2.Good Protection: Basic protection degree meets most environmental requirements
3.Reasonable Cost: High cost-performance ratio, low investment cost
4.Easy Maintenance: Simple structure, low maintenance technical requirements
5.Strong Versatility: Compatible with various standard components
6.Standardization: Uniform dimensions, simple and quick installation
7.Flexible Layout: Can be arranged flexibly according to site conditions
8.Easy Expansion: Supports future capacity expansion and modification
9.Clear Zoning: Functional units are isolated from each other
10.Complete Protection: Reliable protection for all live parts
Ⅲ.Benefits Provided by the Product
1.Quick Installation: Standardized design reduces installation time by 50%
2.Simple Maintenance: Routine maintenance can be performed by regular electricians
3.Ample Spares: Standard components are readily available on the market
4.Low Failure Rate: Mature design ensures extremely low operational failure rate
5.Operational Safety: Comprehensive protection ensures operator safety
6.Reliable Power Supply: Stable performance guarantees power supply continuity
7.Environmental Adaptability: Suitable for various indoor distribution locations
8.Load Matching: Can meet most low-voltage distribution needs
9.Easy Modification: Supports future technical modifications and expansion
Product structure
Ⅰ.Overall Structure Overview
1.Material: 2.0mm high-quality cold-rolled steel plate (2.5mm aluminum-zinc coated plate optional for corrosion resistance)
2.Process: Fully automatic bending and welding forming, passed 30kA dynamic withstand test (peak 63kA)
Ⅱ.Core Structural Highlights
1. Front-Access Maintenance Design
①Door Opening Angle: 90° limited hinge (does not occupy passage space)
②Operation Passage: Width ≥ 600mm, complies with EN 50110 safety clearances
2.Maintenance Advantages:
①No rear space required, maintainable even when installed against the wall
②Tool-less disassembly/assembly of unit modules (MCCB replacement ≤ 10 minutes)
3.Triple Safety Protection System
| Protection Type | Implementation Method | Protective Effect |
|---|---|---|
| Mechanical Interlock | Linkage between door panel and isolator | Automatic power off when door opens (Optional) |
| Physical Isolation | ≥20mm partition between functional units | Prevents phase-to-phase short circuits |
| Visual Management | Transparent viewing window (impact-resistant PC material) | Monitor operating status without opening door |
Ⅲ.Description of Main Structural Components
1.Busbar System
Material: TMY copper bar (conductivity ≥ 98%)
2.Process:
①Tin-plated contact surfaces (thickness ≥ 5μm, anti-oxidation life increased 3 times)
②Rounded corners on busbar bends (avoids corona discharge)
3.Cabinet Manufacturing
| Process | Standard | Quality Assurance |
|---|---|---|
| Surface Treatment | Degreasing → Phosphating → Electrostatic powder coating | Adhesion Level 1 (Cross-cut test) |
| Sealing Design | EPDM rubber seal (Outdoor type) | IP54 verified (12h rain test) |
| Wiring Process | Metal wireways + Marker tubes | Power/Control cable spacing ≥ 50mm |
Specification
Main Technical Parameters Table
| Parameter Item | Technical Specification |
|---|---|
| Rated Operational Voltage | AC 400V |
| Rated Insulation Voltage | AC 690V |
| Rated Frequency | 50Hz/60Hz |
| Horizontal Busbar Rated Current | ≤ 4000A |
| Branch Circuit Rated Current | ≤ 630A |
| Rated Short-Time Withstand Current (Icw) | 30kA/1s |
| Rated Peak Withstand Current (Ipk) | 63kA |
| Protection Degree (IP) | IP30 (Basic Indoor Type) |
| Incoming/Outgoing Line Method | Top/Bottom Incoming + Bottom/Side Outgoing |
| Compliance Certification | CCC, GB 7251.1, IEC 61439-1 |
| Operating Temperature Range | -5°C ~ +40°C |
| Altitude | ≤ 2000m |
When using GGD type low-voltage switchgear, you may want to know the following questions & answers.
Ⅰ.Basic Selection
1. How to choose between 600mm and 800mm deep GGD cabinets?
600mm depth: Suitable for space-constrained scenarios (e.g., renovation of old distribution rooms), supports up to 2500A horizontal busbar;
800mm depth: Recommended for new projects, supports 4000A high current, offers better heat dissipation and more ample wiring space.
2. Can imported circuit breakers like ABB/Schneider be installed?
Fully compatible!
Provides standard 35mm rail mounting positions (compatible with NSX/Tmax etc. MCCBs);
For air circuit breakers (ACBs), reserve +100mm width (e.g., select 1000mm wide cabinet for MT series).
3.Is customization needed for outdoor use?
①The GGD-W outdoor type must be selected:
②Protection degree IP54 (sealing strips added to door gaps);
③Cabinet top rain hood design (inclination angle ≥ 5°);
④Material upgraded to 304 stainless steel (additional +15% cost).
Ⅱ. Installation & Commissioning
1. How much distance needs to be (reserved) for wall-mounted installation?
Minimum space requirements:
Front operation: ≥ 600mm passage required for door opening;
Rear maintenance: No rear space required when installed against the wall (front-access maintenance design).
2. How to deal with door interlock failure?
Three-step emergency troubleshooting:
①Check if the interlock rod is deformed (straighten with a wrench);
②Clear dust accumulation in the lock hole (blow with compressed air);
③Lubricate transmission parts (engine oil is prohibited, use special grease).
Ⅲ. Operation, Maintenance & Economics
1. Is power off required for fuse replacement?
Power must be disconnected! Operating procedure:
①Disconnect the upstream power supply →②Confirm de-energized with a voltage tester →③Open the door panel and replace the fuse link →④Reset the door interlock.
Why Choose us ？
Built to last, engineered to perform.
Kete Transformer is a key national-level manufacturer specializing in transformers, recognized as a “Contract-Honoring and Promise-Keeping” enterprise, a high-tech enterprise, and a national-level enterprise technology center. It is recommended in the national directory for rural and urban power grid construction and renovation, as well as a recommended supplier of major electromechanical equipment for hydropower projects. Its products have been awarded the title of “National Quality Inspection Qualified Product – Quality Trustworthy Product” and “Nationally Recognized Product for Mechanical Industry Users.
Our Project
Our products not only dominate the domestic market but are also exported to more than 30 countries and regions, including Russia, Southeast Asia, Africa, and the Americas, serving industries such as power, municipal engineering, metallurgy, and petrochemicals.
