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Hitachi has developed 24kV vacuum insulated switchgear in order to eliminate the risk of greenhouse gas emission, to meet customer requirement such as compact design and low maintenance. C-VIS mainly consists of vacuum insulated switch and grease-free hybrid type electro-magnetic actuator. It has features of compactness & reliability of GIS (gas insulated switchgear) and accessibility of AIS (air insulated switchgear) based on Hitachi's vacuum technologies.


  • Dual Contact design (High reliability of interrupt and disconnect)
  • SF6 gas free -Vacuum Insulation
  • Compact design
  • Grease free
  • Continuous monitoring of vacuum leak

Illustration of Cubicle type Vacuum Insulated Switchgear

3.Rating and Specifications

Rating and Specifications
Rated voltage (kV) 24
Rated frequency (Hz) 50/60
Rated short duration power frequency withstand voltage (kV) 50
Rated lightning impulse withstand voltage (kVp) 125
Rated short time withstand current 3s (kA) 25
Rated short circuit breaking current (kA) 25
Rated normal current - busbar (A) 1250
Rated normal current - feeder (A) 630/800/1250
Width (mm) feeder 600
bus section 600
feeder metering 600
Depth (mm) feeder 1300
bus section 1300
feeder metering 1300
Height (mm) 2000
Weight (kg) feeder 650
bus section 750
feeder metering 750