Rotavolt Auto-Transformers

ROTAVOLT Variable Auto Transformers

Watford Control

Rotavolt Variable Auto-Transformers provide a continuous linear regulation of AC voltage, with high efficiency and negligible waveform distortion. It offers a precise and effective method of controlling current, light, heat, motor speed and any parameter with a voltage factor.


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Single and three phase models come in 9 frame sizes and rating up to 60kVA. Motorised versions available for remote or automatic operation.

Key Features - ROTAVOLT Range

  • 9 frame sizes and ratings up to 60kVA.
  • Single and three phase models.
  • Ideal for high-speed servo applications.
  • Multi ganged units available.
  • Output Voltage continuously variable from 0 - 115% of input voltage. Motorised versions available for remote or automatic operation.