GG-1A(F) fixed indoor AC metal-enclosed switchgear
GG-1A(F) fixed indoor AC metal-enclosed switchgear is suitable for receiving and distributing electric energy in three-phase AC single busbar and single busbar bypass systems with rated voltage of 3–10kV and rated frequency of 50Hz. It is one of the most widely deployed fixed-type medium voltage switchgear models in China’s power distribution networks, with a proven track record spanning several decades of reliable operation.
The “F” designation indicates the arc-resistant variant, which incorporates reinforced arc containment and pressure-relief features to enhance operator safety during internal arc fault events. The switchgear adopts a fixed-mounting open-frame construction with all main components — including circuit breakers, disconnectors, current and voltage transformers, and protective relays — permanently mounted on a steel frame structure within a metal-enclosed housing.
Technical Specifications
ItemSpecificationRated Voltage3kV / 6kV / 10kVRated Insulation Voltage12kVRated Frequency50Hz / 60HzRated Current (Main Busbar)630A – 3150A (standard) / up to 4000A (custom)Rated Short-time Withstand Current (Icw)20kA / 25kA / 31.5kA (4s)Rated Peak Withstand Current (Ipk)50kA / 63kA / 80kABusbar SystemSingle busbar / Single busbar with bypassDegree of ProtectionIP2X – IP3X (enclosure)Installation TypeFixed mounting, indoorCircuit Breaker TypeVacuum circuit breaker (ZN series) or SF6 (optional)Switching Device OptionsCircuit breaker / Load switch / Disconnector / Earthing switch combinationsOperation MechanismManual spring-operated or electromagnetic mechanismMechanical Endurance≥ 2,000 operations (disconnector)StandardsGB 3906, DL/T 404, IEC 62271-200
Key Features
- Fixed Open-Frame Construction: All components are permanently mounted on a steel frame within the enclosure — the open-frame design provides excellent ventilation, easy access for inspection, and straightforward maintenance with complete visibility of all components
- Industry-Proven Platform: GG-1A(F) is one of the most widely adopted fixed switchgear models in Chinese power distribution history, with thousands of installations operating reliably across industrial plants, substations, and utility networks
- Flexible Configuration: Supports single busbar and single busbar with bypass systems — the bypass configuration enables continued power supply to critical loads during maintenance of individual feeder circuits
- Arc-Resistant Variant (F-Type): The reinforced arc-resistant design incorporates pressure-relief flaps and strengthened door latches to safely contain and vent arc fault gases, protecting operating personnel in accordance with IEC 62271-200
- Versatile Component Compatibility: Compatible with a wide range of switching devices — vacuum circuit breakers (ZN series), load switches, disconnectors, and earthing switches — allowing customization to specific application requirements and budget constraints
- Large Cable Termination Space: The generous enclosure dimensions provide ample space for cable entry, termination, and CT/VT installation, simplifying on-site cable connection and reducing installation time
- Cost-Effective Distribution Solution: Lower initial investment and simpler maintenance requirements compared to withdrawable alternatives of equivalent rating, making it the preferred choice for standard medium voltage distribution projects with limited budgets
- Proven Arc Resistance: The “F” variant design has been verified through extensive type testing to withstand and contain internal arc faults, providing certified operator protection
Applications
- Industrial enterprise power receiving and distribution substations
- Thermal and hydro power plant auxiliary power systems
- Mining and metallurgy power supply
- Commercial and institutional building medium voltage distribution
- Urban and rural distribution substations
- Existing substation renovation and capacity expansion projects
- Small to medium industrial facility main switchboards