Variable Transformers

Our Rotavolt variable autotransformers provide a continuous linear regulation of AC voltage, with high efficiency, without distorting waveforms significantly.

The Watford Control Rotavolt provides a precise and effective way of controlling current, light, heat, motor speed or any other type of output that has a voltage factor.

Our Rotavolt autotransformers are the backbone of our EM Voltage Stabilisers, renowned for their unrivalled accuracy and reliability, with tens of thousands of systems in operation around the world.

We offer a range of specifications depending on your needs. Here are some key features to help you choose the best option:


  • Over 10,000+ Products Shipped Worldwide
  • Independent 3 Phase Control
  • Unrivalled Voltage Correction Range of ± 40%
  • Large Range of Models From 1kVA to 4mVA Single or Three Phase
  • Solid State or Electro Mechanical Operation
  • Fully Customisable to Unique Customer Requirements

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16A Princewood Road
Earlstrees Industrial Estate
NN17 4AP
United Kingdom

Tel: +44 (0) 333 210–2–240
Email: info@watfordcontrol.com


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