Variacs

Variacs are also known as autotransformers and are a speciality type of the electrical transformer that consists only one winding. The winding acts as both primary and secondary sides of the transformer. The ordinary type of transformers have 2 coils instead and they are not electrically connected. The one winding resolution allows for producing a smaller, lighter and cheaper transformers than ordinary 2 winding ones. They also feature lower leakage reactance, lower losses lower excitation current and increased VA rating for a given size and mass. At the other side, the disadvantage is a lack any electrical insulation between circuits. It can result in full input voltage applied to the output.
Variacs/Autotransformers are commonly used for:
• Power transmission and distribution – Variacs ensure that voltage at the beginning of the power distribution line is equivalent to the voltage at the end of the line.
• Power conversions – Variacs are able to convert common domestic mains voltage bands that are in use across the world. For example 200 V to 250 V or 100 V to 130V.
• Audio systems – Autotransformers are used to adapt speakers to constant- voltage distribution and for matching impendence levels.

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Description Price Primary Voltage Rating Secondary Voltage Rating Power Rating Mounting Type Knob Rotation Number of Phases Number of Outputs Termination Type Weight Dimensions Primary Current Rating Depth Diameter Length
RS Stock No. 890-2812
BrandRS PRO
SGD842.27
Each
units
240V 0 → 240 V, 0 → 270 V 3.6kVA Surface Mount Clockwise 1 1 Wire Termination 14kg 225 x 225 x 190mm 15A 190mm - 225mm
RS Stock No. 890-2875
BrandRS PRO
SGD1,024.34
Each
units
240V ac - 2.4kVA Stand Alone Clockwise 1 - Wire Termination 12kg 280 x 200 x 200mm 10A 200mm - 280mm
RS Stock No. 117-6015
Mfr. Part No.MVT1.4k/5A-1
SGD206.10
Each
units
240V - 1.4kVA Panel Mount Clockwise 1 1 Clamp 11kg 170 (Ø) x 176mm - - 170mm 176mm
RS Stock No. 890-2787
BrandRS PRO
SGD751.44
Each
units
240V 0 → 240 V, 0 → 270 V 3.6kVA Surface Mount Clockwise 1 1 Wire Termination 13kg 225 x 225 x 135mm 15A 135mm - 225mm
RS Stock No. 117-6021
Mfr. Part No.MVT1.4k/5A-1E
SGD511.66
Each
units
240V - 1.4kVA Surface Mount Clockwise 1 1 - 13kg 275 x 210 x 270mm 13A - - 275mm
RS Stock No. 890-2872
BrandRS PRO
SGD1,320.49
Each
units
240V ac 0 → 240V ac 2.4kVA Stand Alone Clockwise 1 - Wire Termination 12kg 270 x 210 x 200mm 10A 200mm - 270mm
RS Stock No. 117-6022
Mfr. Part No.MVT2.5k/9A-1E
SGD636.52
Each
units
240V - 2.5kVA Surface Mount Clockwise 1 1 - 18.5kg 275 x 214 x 270mm 13A - - 275mm
RS Stock No. 117-6020
Mfr. Part No.MVT1k/3.5A-1E
SGD988.97
Each
units
240V - 1kVA Surface Mount Clockwise 1 1 - 10kg 275 x 214 x 270mm 13A - - 275mm
RS Stock No. 890-2825
BrandRS PRO
SGD1,282.73
Each
units
240V 0 → 240 V, 0 → 270 V 6.72kVA Surface Mount Clockwise 1 1 Wire Termination 25kg 300 x 300 x 225mm 28A 225mm - 300mm