The GGD type AC low-voltage switchgear cabinet is a classic fixed-type and economical low-voltage power distribution device in China, specifically designed for AC 50Hz, rated voltage 380V/400V power distribution systems. It is used for power reception, distribution, control and protection. With the core advantages of reliable structure, low cost and easy maintenance, it is the mainstream choice for small and medium-sized power distribution scenarios.
1. Application scope and compliance standards
Rated voltage: AC 380V/400V (up to 660V optional)
Rated frequency: 50Hz
Rated current: 1000A - 3150A (horizontal busbar maximum 4000A)
Applicable scenarios: power plants, substations, industrial and mining enterprises, commercial buildings, municipal engineering, small photovoltaic / wind power stations and other conventional power distribution scenarios. enforce standards
GB 7251.1-2013 "Low Voltage Switchgear and Controlgear - Part 1"
GB/T 7251.12-2013 "Low Voltage Switchgear and Controlgear - Part 2"
IEC 60439 series of standards
II. Core Technical Parameters
Rated Insulation Voltage: 690V
Rated Working Voltage: 380V/400V
Rated Current (Horizontal Busbar): 1000A - 4000A
Rated Short-Term Withstand Current: 30kA/50kA/80kA (1s)
Rated Peak Withstand Current: 63kA/105kA/176kA
Protection Grade: IP30 (Standard), IP40/IP54 (Custom)
Cabinet Dimensions: Height 2200mm × Width 600/800/1000/1200mm × Depth 600/800mm
Mechanical Life of Circuit Breaker ≥ 10,000 Times
III. Structural Features (Fixed-Type Classic Design)
1. Cabinet Frame
Made of 8MF cold-formed steel welded/soldered, with high strength and rigidity; the frame is equipped with 20mm/100mm modular holes, with strong versatility.
2. Functional Divisions
Strictly divided into three independent compartments, with fault arc isolation, high safety
Busbar Chamber: Above the rear part, arranged for the main busbar, equipped with high insulation busbar clips
Functional Unit Chamber: In the middle, fixedly installed with circuit breakers, contactors, transformers, etc.
Cable Chamber: At the bottom, facilitating cable entry and wiring
3. Cabinet Door and Protection
Double Door / Single Door Design, equipped with observation window and safety door lock
Cabinet Surface Phosphating + Electrostatic Spraying, corrosion-resistant and durable
Complete Grounding System, ensuring personal safety
4. Heat Dissipation Design
The cabinet has ventilation slots on the top and bottom, natural convection for heat dissipation, suitable for long-term full-load operation
IV. Performance Advantages
1. Strong Arc Breaking and Stability
Excellent dynamic and thermal stability, capable of withstanding 50kA and above short-circuit currents, reliable fault breaking.
2. Cost-Efficient and High Value for Money
Fixed-type structure, without complex drawer mechanism, overall cost lower by 30% - 40% compared to withdrawable cabinets.
3. Simple Maintenance, High Reliability
Elements are fixedly installed, no risk of plugging and unplugging faults; intuitive maintenance, suitable for non-professional personnel operation.
4. Flexible Scheme, Strong Combination Ability
Can be composed of: incoming line cabinet, feeder cabinet, bus tie cabinet, motor control cabinet, lighting cabinet, reactive power compensation cabinet, etc.
5. Good Environmental Adaptability
Suitable for indoor conventional environments, protection grade can be customized to meet general industrial and civil needs.
V. Typical Application Scheme
Power Distribution Center: Large current incoming line and feeder, suitable for motors, pumps, fans, etc.
Lighting Distribution System: Centralized control of lighting circuits in shopping malls, office buildings, factories
Motor Control Center (MCC): Fixed installation of starters, protectors, control single/multiple motors
Reactive Power Compensation: Combined with GGJ compensation cabinet to enhance system power factor
Small-scale New Energy Grid Connection: Low-voltage side collection, grid connection and protection for photovoltaic/wind power
VI. Selection Key Points
Capacity Matching: Select cabinet type and busbar specifications according to transformer capacity (≤2500kVA) and total load current
Arc Breaking Capacity: ≥ 30kA select GGD2, ≥ 50kA select GGD3
Protection Grade: Ordinary indoor IP30; humid/muddy environment select IP40 or above
Number of Circuits: Single cabinet up to 12 circuits, multiple circuits require multiple cabinets to be connected
VII. Summary
GGD low-voltage switchgear is positioned as fixed-type, highly reliable, low-cost, and easy to maintain, and is one of the most widely used low-voltage cabinet types in China. Especially suitable for medium-sized distribution projects with moderate power supply continuity requirements and pursuit of cost-effectiveness, it can directly replace traditional old-style distribution cabinets and meet the needs of conventional power, lighting, and control.