Robust toroidal variable auto transformers providing continuously adjustable AC voltage — air-cooled, oil-cooled, and motorised options, NATA tested for Australian compliance.
| Transformer Type | Toroidal variable auto transformer | Continuously variable |
| Phases | Single-phase & Three-phase | Wide range of ratings |
| Input Voltage | 230V / 415V AC, 50Hz | Standard Australian supply |
| Output Voltage | 0 to line voltage (continuously variable) | Smooth stepless control |
| Cooling Options | Air-cooled / Oil-cooled / Motorised | Application dependent |
| Voltage Regulation | Stepless, manual or motorised | Carbon brush contact |
| Compliance | NATA tested, EMC compliant | Australian standards |
| Winding Material | Copper | High conductivity |
| Duty Cycle | 100% continuous | Industrial rated |
| Frequency | 50/60 Hz | Universal compatibility |
The Dimmer Dot range of variable auto transformers (variacs) is manufactured by Green Dot Electric Corp in Sahibabad, India — a specialist transformer manufacturer established in 1979. Australian Rectifiers is the exclusive distributor for Australia, New Zealand, and Papua New Guinea.
Variacs use a toroidal core with a carbon brush contact to provide continuously variable AC voltage output from 0 to full line voltage. Unlike electronic voltage controllers, variacs deliver a clean sinusoidal output waveform with no harmonic distortion — making them ideal for sensitive laboratory equipment, precision industrial processes, and applications requiring pure AC waveform control.
Available in single-phase and three-phase configurations with air-cooled, oil-cooled, and motorised options, the Dimmer Dot range covers applications from small bench-top laboratory units through to large industrial process control systems. All units are NATA tested in Australia for EMC compliance.
Tell us your application, required phase, voltage range, and cooling preference — our technical team will respond within 1 business day with pricing and configuration recommendations.
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