Variable toroidaltransformer (Variac)

We offer single-phase and three-phase variable toroidal transformers, also known as “Variacs”. Control currents can be up to 200 A per winding. The regulators are fitted with carbon contact rollers and can be equipped with a motor drive and electronic control unit in addition to a rotary knob. This allows you to use the regulators as follower control (booster), voltage stabiliser, grid stabiliser or to set up complete testing systems with control circuits for voltage or electricity. This is a perfect solution for controllable free-run DC power supply systems.


  • Use with variable AC setting between 0 and 100 %
  • Open design for vertical static installation
  • Stainless steel shaft flange
  • Ambient temperature max. 40 °C
  • Insulating material class B (130 °C)
  • Vertical design is standard, 3-phase-type vertical axis
  • Rotary heads and dials optional
  • Manual or motorised drive with accessories (please order separately)
  • All 50 Hz variable toroidal transformers can be used up to 400 Hz sine