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G&W model VTVI 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, dead front device.  The VTVI can be configured to provide 1-phase or 3-phase operation of the fault interrupting ways.  The switches are designed for use on 3-phase systems with voltages up to 38kV, 630A load break and continuous current, with 12.5kA and 20kA symmetrical fault interrupting ratings. The VTVI works well 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
  • 15.5kV -38kV with 40kA asymmetrical load break momentary and close into fault ratings
  • 630A continuous and load break ratings
  • 12.5kA and 20kA symmetrical fault interrupting ratings fully tested to IEEE C37.60

VTVI ratings

Maximum design voltage

15.5 kV

27 kV

38 kV

Voltage class

15 kV

25 kV

35 kV

Impulse level (BIL)

110 kV

125 kV

150 kV

One minute withstand

35 AC kV

60 AC kV

70 kV

One minute withstand, production test rating

34 AC kV

40 AC kV

50 kV

15 minute withstand

53 DC kV

78 DC kV

103 kV

Continuous and load break current

630 Amps

630 Amps

630 Amps

Momentary current

40 kA asym

40 kA asym

40 kA asym

Fault close current, (3 times)

32 kA asym

32 kA asym

32 kA asym

One second current

25 kA sym

25 kA sym

25 kA sym

Fault interrupting rating

12kA or 20kA 12kA or 20kA 12kA or 20kA

Mechanical endurance, operations




IEEE C37.60

Fault Interrupting Duty

Total number of fault interruptions: 116

Percent of Maximum Interrupting Rating

No. of Fault Interruptions

15 – 20%


45 – 55%


90 – 100%



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