12kV ring main unit - standard customized
(GFX-12 SF6 gas insulation)
(GFX-12 SF6 gas insulation)

Product overview

GFX-12 series SF6 standardized ring main unit is a new product developed according to the State Grid Corporation “The standardized Design and Customization Scheme of 12kV Ring Main Unit”,there are two types of cabinets: circuit breaker cabinet and composite apparatus cabinet, it has two forms of side expansion and top expansion, the interface type of the primary and secondary equipment conforms to the standard requirements of the state grid, and its general interchangeability is strong. To achieve any combination and full modularization through the extension of the busbar. The extended busbar is fully insulated and shielded, with dynamic and thermal stability, ensuring high reliability and safety. GFX series standardized ring main unit is mainly used in the State Grid housing project, also suitable for the transformation of power system urban network, distribution power station and load center power station, petrochemical industry, steel and mining industry, general enterprises and institutions, high-rise buildings, etc.

Main technical parameters

ProjectUnitCircuit breaker cabinet

Combined electrical cabinet

Rated voltagekV12
Power frequency withstand  voltage(1min)Phase to phase and phase to  groundkV42
Between open contactskV48
Lightning impulse withstand  voltagePhase to phase and phase to  groundkV75
Between open contactskV85
Rated peak withstand  currentHz50
Rated currentA630125   
Rated short-circuit  breaking currentkA2031.5   
Rated short-time withstand  current


Rated peak withstand  currentkA50/   
Rated short-circuit making  currentkA/80   
Rated transfer currentA/1500   
Annual leakage rate≤0.1%
Arcing test20kA 1s
Protection gradeAir boxIP 67
Ring main unitIP 4X


 Side expansion, top  expansion