12kV ring network cabinet - Standardized customization
(EFX-12 environmentally-friendly gas insulation)
(EFX-12 environmentally-friendly gas insulation)

Product overview

EFX-12 series environmentally-friendly gas(dry air) standardized ring main unit is a circuit breaker cabinet developed according to the State Grid Corporation “The standardized Design and Customization Scheme of 12kV Ring Main Unit”,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. EFX-12 series ring main unit does not need SF6 gas, reduces the damage to the atmosphere, with significant ecological benefit, it is the future direction of environmentally-friendly electrical equipment.

EFX series standardized ring main unit is mainly used in the housing and distribution projects of the State grid, and is also suitable for the transformation of power system urban network, power distribution 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    
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 frequencyHz50
Rated currentA630    
Rated short-circuit breaking currentkA20    
Rated short-time withstand currentkA/s20/4    
Rated peak withstand currentkA50    
Annual leakage rate≤0.1%
Arcing test20kA 1s
Protection gradeair boxIP 67
Ring main unitIP 4X
Extension-method Side expansion, top expansion