Instrument Transformers for gas-insulated Switchgear
GIS RC Voltage Divider

Trench was a pioneer for the delivery of the first SF6  insulated Instrument Transformers for gas-insulated switchgears (GIS) in 1965. Today Trench manufactures a complete range of: 

  • Current Transformers – type SA/SAD (single and three phase)
  • Voltage Transformers – type SU/SUD (single and three phase) 
  • For applications from 72.5 kV up to 800 kV (up to 245 kV for three phase)



  • Designed in accordance with main international standards
  • Custom-designed for each specific application
  • Integrated ferroresonance damping
  • Shielded against transient overvoltages
  • Guaranteed SF6 -leakage rate of less than 1 % per year
  • Equipped with pressure relief disc and deflection device
  • All components are designed and tested for mechanical stress to withstand up to at least 20 g
  • Accuracy classes in accordance to DIN VDE 0414, IEC 61689, ANSI: IEEE C57.13, AS 1243 (other standards or classes on request)
  • Shock indicators warning against inadmissible acceleration during transportation


Trench also manufactures GIS RC Voltage Dividers.  For more information please download our brochure.

GIS RC Voltage Divider