HD4 SF6 Circuit Breaker 12-40.5kV 3150A – Indoor Gas Insulated Switchgear Maintenance-Free Lifetime Sealed

Advanced HD4 SF6 Circuit Breaker Series: Premium indoor high voltage SF6 gas circuit breaker (fixed/withdrawable/side mounted) using sulfur hexafluoride gas (SF6) as arc extinguishing and insulating medium for three-phase AC power systems from 12kV to 40.5kV at frequency 50/60Hz, delivering 630-3150A rated current, 12.5-50kA rated breaking capacity, 31.5-125kA short-circuit closing current, lifetime sealed poles maintenance-free, thermal expansion + compressed air blowing arc extinguishing technology ensuring smooth breaking characteristic with no current chopping, no reignition, no operating overvoltage, REH spring operating mechanism, 45ms breaking time, 10-15ms arc burning time, compact dimensions, three gas tightness check tests.

Multi-Industry and Maintenance-Free Ready: HD4 incorporates automatic buffer breaking technology, withstands insulation voltage even at zero relative pressure, up to 30% rated breaking capacity at zero pressure, fixed/withdrawable design with trolley movement, mechanical safety lock preventing incorrect operation, operating at -5°C to +40°C, providing reliable SF6 circuit breaking solution for power plants, transformer substations, petrochemical industry, metallurgy, manufacturing, airports, residential areas, especially suitable for distribution lines, motors, transformers, capacitor banks, compensating reactors, capacitive/inductive load applications.