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On-load tap changers type VUCG

The VUC types of on-load tap changers come in a range of models with ratings suitable for most applications. They are mounted inside of the transformer tank, suspended from the transformer cover. The VUC types operate with arc quenching in vacuum interrupters.

The VUC types complete the UC family of tap changers, with their excellent service record since the 1960’s.

The VUCG is the smaller of the VUC types and is suitable for transformers up to 800 MVA with a BIL rating of 1050 kV and current rating of 1800 A.

 Product scope

  • Base technology: Vacuum, resistance, in-tank, diverter switch
  • Common applications: Network, special, industrial, HVDC

Tap-changer placed in the neutral point of the winding

Other placements of the tap-changer

Highest voltage for equipment (Um)

300 kV

300 kV

Max lightning impulse (BIL)

1050 kV

1050 kV

Max current
1-phase (one tap-changer/phase)

800 A
1800 A

1800 A

Enforced current splitting
1-phase (one tap-changer/phase)



Max step voltage

3500 V

3500 V


Why ABB?

  • Plug-and-play interchangeability with traditional type UCG only requires diverter switch replacement.
  • Redundant switching capacity in the auxiliary contact system.
  • Maintenance in any tap position and without dismantling the shaft system, thus eliminating the risk for failure from improper assembly or alignment.
  • Possible to use alternative insulating fluids


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