Selecting the Right GGD Switchgear Tier: Breaking Capacity Matched to Fault Level

The governing specification for a customizable GGD low voltage fixed switchgear 380V, breaking capacity 15/30/50kA, low voltage distribution cabinet AC panel is not rated current alone — it is the breaking capacity tier matched to the prospective short-circuit current at the installation point. The JYDQ GGD Series provides three type-tested tiers: GGD1 at 15kA (30kA peak), GGD2 at 30kA (63kA peak), and GGD3 at 50kA (105kA peak). Each tier addresses a specific fault-level scenario in a 380V distribution network, and selecting a lower-rated tier for a high-fault-level position creates a protection gap invisible under normal operation. Nine current models covering 400A to 3150A make this customizable GGD low voltage fixed switchgear 380V, breaking capacity 15/30/50kA, low voltage distribution cabinet AC panel a complete platform for every LV distribution position.

GGD Tier Selection Reference

GGD1 (15kA / 30kA peak, 400A–1000A): Sub-distribution panels and auxiliary boards supplied from transformers below 630kVA. Prospective fault current within 15kA. Moving to a position closer to the transformer secondary requires upgrading to GGD2 or GGD3.

GGD2 (30kA / 63kA peak, 600A–1600A): Main distribution boards in medium-scale industrial and commercial installations, typically from 630kVA to 1600kVA transformers. Covers the majority of industrial park and commercial main incoming positions where fault levels fall between 15kA and 30kA.

GGD3 (50kA / 105kA peak, 2000A–3150A): Main incoming switchboards directly connected to large transformer secondaries. Where supply is from 2000kVA to 3150kVA units or 20kV transformer installations with low-impedance windings, prospective fault current approaches 50kA. Cable short circuit capacity at main busbars must be matched to the 105kA peak withstand rating of this tier.

GGD Series Model Specifications

Cabinet Construction

The GGD cabinet uses cold-rolled steel rigid open-frame construction, rated to withstand peak fault currents up to 105kA. Front-access design provides direct reach to circuit breakers, busbars, and cable terminations. High-conductivity copper or aluminum busbars are top-mounted in a segregated compartment. Side-by-side bolted assembly with factory-prepared busbar links enables on-site switchboard extension for industrial parks with phased load growth. For this fixed pattern switchgear platform, specifying cable entry direction, busbar layout, and internal equipment before order placement avoids the field modifications that affect schedule and cost when a switchboard arrives with configurations mismatched to the civil layout.

Key Product Features

• Configurable for Application Requirements: Standard nine-model configurations reduce lead times for most projects. When VFD integration, bay control unit function automation, capacitor bank positions, or non-standard cable entry are required, modifications are engineered within the same type-tested framework. This customizable GGD low voltage fixed switchgear 380V, breaking capacity 15/30/50kA, low voltage distribution cabinet AC panel approach reduces site coordination complexity versus field-fabricated solutions.
• Complete Equipment Integration: Factory-assembled with ACBs (630–3150A), MCCBs (100–630A), MCBs (6–63A), current transformers, digital power meters, power factor correction capacitor banks with shunt reactor filtering for harmonic-loaded installations, soft-starters, VFDs, and PLCs. Circuit breaker making capacity and cable short circuit capacity demands in procurement specifications are confirmed by the type-tested assembly. A GGD switchboard can cover main incoming, distribution, motor control, and automation in one enclosure set.
• IEC 61439 and GB 7251 Certification: Every GGD switchgear configuration is type-tested to IEC 61439-1/-2 and GB 7251. Routine tests per unit — 2500V dielectric withstand, insulation resistance, busbar torque, mechanical operation, and functional circuit checks — confirm replication of type-test performance. For substation EPC procurement, this customizable GGD low voltage fixed switchgear 380V, breaking capacity 15/30/50kA, low voltage distribution cabinet AC panel delivers consistent IEC 61439 documentation and uniform busbar interfaces across all project sites. Confirm applicable standard editions with the certification body before specifying for regulated markets.
• Expandable Busbar Architecture: Factory-prepared bolt-on busbar linking sections support switchboard extension with standard hand tools, without cutting or welding. The rrrv circuit breaker and ACB ratings remain within the type-tested envelope at each stage, provided fault level does not increase beyond the original tier. The 20kV transformer secondary at a GGD3 main incoming position is served by the 105kA peak withstand without current-limiting reactors.

Application Scenarios

Industrial Main Incoming and EPC Procurement

At 2000kVA to 3150kVA transformer secondaries where fault current approaches 50kA, GGD3 at 3150A/50kA is the correct choice. This customizable GGD low voltage fixed switchgear 380V, breaking capacity 15/30/50kA, low voltage distribution cabinet AC panel eliminates the breaking capacity gap at fault-critical positions. EPC contractors benefit from consistent documentation and uniform busbar geometry across multi-site projects.

Commercial Buildings and Motor Control

GGD2 handles commercial HVAC, elevator, lighting, and motor control boards. Capacitor banks with shunt reactor damping integrate into the same enclosure for power factor correction. GGD1 serves sub-distribution and lighting feeder positions.

Commercial Terms

Standards

• IEC 61439-1/-2: Low-voltage switchgear and controlgear assemblies
• GB 7251: Low-voltage switchgear and controlgear assemblies
• IEC 60529: Degrees of protection (IP Code)
• ISO 9001: Quality management system

FAQ

1. What is GGD low voltage fixed switchgear used for?

GGD is indoor fixed low voltage switchgear. It is used for receiving and distributing AC low-voltageelectric energy, and implementing circuit protection against overload and short-circuit fault in industrialplants, commercial buildings and power distribution stations.

2. What structural features does GGD switchgear have?

It adopts rigid fixed cabinet frame structure. The cabinet body has high mechanical strength and goodheat dissipation performance. The layout is simple and stable, convenient for on-site assembly and long-term continuous operation.

3. What core technical parameters of GGD can be customized?

We can customize rated current, short-circuit withstand capacity and main circuit layout. The cabinet scheme can be adjusted according to different low-voltage load demands of the project.

4. What certifications do your GGD low voltage fixed switchgears have?

All our GGD low voltage fixed switchgears hold CE certification. We can provide CE documents and complete technical datasheets for tender submission and customs clearance.

5. What warranty support can you provide for GGD switchgear?

We provide 10 years warranty for all GGD low voltage switchgears. Our technical team provides remote operation guidance and fault analysis during the whole warranty period.