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G&W model VTFI vault switches include load break and fault interrupting capability. The load break switch features visible break and integral ground position. The integral ground position eliminates the need to handle any high voltage connections to ground the cable connected to the load break ways. The fault interrupters provide electronically controlled, resettable over current protection in a totally sealed, submersible, dead front device.  The switches are designed for use on 3-phase systems with voltages up to 27kV, 630A load break and continuous current, with 12.5kA symmetrical fault interrupting ratings. The VTFI is ideal for vault style applications because it features front accessible switch operators and bushings (front access) so it can fit within tight sub surface vaults or equipment rooms.

The switches are designed to IEEE C37.71, C37.74, and C37.60 for load break and fault interrupting capability. 

  • The switch is completely submersible
  • Controls for overcurrent protection are packaged in NEMA4X enclosures for dry vaults, NEMA 6P enclosures for wet vaults or IP68 stainless steel enclosures for long term submersion.
  • Front accessible switch operators and bushings (front access) so the switch can fit in tight installations
  • For use on 15kV and 27kV systems with 630A continuous and load break ratings
  • 12.5kA symmetrical fault interrupting ratings fully tested to IEEE C37.60

VTFI ratings

Maximum design voltage

15.5 kV

27 kV

Voltage class

15 kV

25 kV

Impulse level (BIL)

110 kV

125 kV

One minute withstand

35 AC kV

60 AC kV

One minute withstand, production test rating

34 AC kV

40 AC kV

15 minute withstand

53 DC kV

78 DC kV

Continuous and load break current

630 Amps

630 Amps

Momentary current

40 kA asym

40 kA asym

Fault close current, (3 times)

32 kA asym

32 kA asym

One second current

25 kA asym

25 kA asym

Fault interrupting ratings

12.5 kA sym

12.5 kA sym

Mechanical endurance, operations



IEEE C37.60

Fault Interrupting Duty

Total number of fault interruptions: 116

Percent of Maximum Interrupting Rating

Approx. Interrupting Current, Amps

No. of Fault Interruptions

15 – 20%



45 – 55%



90 – 100%




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