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Generator circuit-breaker HVS-63S up to 63 kA

System type generator circuit-breaker (GCB) with innovative built-in monitoring

The HVS-63S GCB with SF6 interrupting technology for short-circuit currents up to 63 kA and rated currents up to 7,150 A suitable for generators of up to 200 MW. Based on the well-proven HVR-63 technology, the new GCB is a full system-type with the following features:

  • Built-in erosion monitoring feature for real-time visual indication of the remaining time to service 
  • HMB-1 spring drive offers 50 percent less energy demand compared to mid-sized GCB
  • Combined disconnector and earthing and starting switch allows use of only one operating mechanism per pole
  • Low SF6 content of only 5.1 kg for three poles, with low leakage rate of less than 0.1 percent per year 
  • Innovative breaking chamber with double main contacts for higher stability of resistance during maintenance span (20 years or 10,000 close-open operations).
  • Compact design fits into a standard 20-feet container for easy transportation and handling.


  • New installations, replacement and retrofit of power plants up to 200 MW
  • Most optimal system type solution for smaller capacity power plants

Why Hitachi Energy?

  • System type GCB with built-in contact erosion indicator for highest safety and reliability
  • Fully assembled, factory tested plug-in design brings substantial time and cost savings in installation and commissioning
  • Type tested and exceeds the mandatory requirements of the latest GCB standard and IEEE C37.013
Available options:

Brief performance data

Type HVS-63S
Rated maximum voltage [kV] 24
Rated frequency [Hz] 50 / 60
Rated power frequency withstand voltage [kV] 60 / 70
Rated lightning impulse withstand voltage [kV] 125 / 145
Rated normal current [A] up to 7,150 / 6,900
Rated short-circuit breaking current [kA] 63

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