VFI Vacuum Fault Interrupter Switchgear

Smart VFI Underground Distribution Switchgear

VFI underground distribution switchgear provides an environmentally preferred, safer, and more reliable approach to medium-voltage switching and protection, with optional advanced intelligence. Dead-front construction and enhanced operating features provide added safety. All internal parts are completely immersed within a sealed insulating medium. A variety of fluid and gas insulating media are available, including E200 – a fire-resistant, non-toxic, biodegradable, liquid dielectric coolant.

Certifications IEEE Std C37.60™ standard; IEEE std C37.74™ standard
Nominal Voltage 15 kV, 25 kV, or 35 kV
Maximum Design Voltages, kV 15.5, 27.0, or 38.0
BILs, kV 95, 125, or 150
Vacuum Fault Interrupter: Continuous Current, (max.), A 600, 900, or 1200


  • Optional E200 fluid, the environmentally-preferred switchgear dielectric, obsoletes potent greenhouse gas (SF6) equipment
  • Using E200 fluid eliminates costs of compliance with increasing government regulations
  • Vacuum switching never contaminates the insulating medium
  • Deadfront construction improves safety for utility personnel and the general public
  • Single- or three-phase tripping
  • Visible-break and grounding switches are available options for added safety
  • Optional Tri-Phase electronic control provides a flexible solution for timecurrent-curve coordination
  • Optional Edison™ Idea™ relays allow enhanced functionality in protection and communication

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