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. 890-2897
BrandRS PRO
SGD3.20
Each
units
- - - Surface Mount - - - Wire Termination 5g 6 x 2.5 x 10mm - 10mm - 6mm
RS Stock No. 117-6012
Mfr. Part No.MVT0.3/1.1A-1
SGD167.58
Each
units
240V - 300VA Panel Mount Clockwise 1 1 Clamp 5kg 103 (Ø) x 172mm - - 103mm 172mm
RS Stock No. 890-2888
BrandRS PRO
SGD4.04
Each
units
- - - Surface Mount - - - Wire Termination 5g 10.5 x 3mm - 3mm 10.5mm -
RS Stock No. 117-6017
Mfr. Part No.MVT3.3k/12A-1
SGD343.46
Each
units
240V - 3.3kVA Panel Mount Clockwise 1 1 Clamp 18kg 205 (Ø) x 178mm - - 205mm 178mm
RS Stock No. 890-2878
BrandRS PRO
SGD1,004.11
Each
units
240V ac 0 → 240V ac 1.2kVA Stand Alone Clockwise 1 - Wire Termination 10kg 270 x 210 x 200mm 5A 200mm - 270mm
RS Stock No. 890-2806
BrandRS PRO
SGD474.86
Each
units
240V 0 → 240 V, 0 → 270 V 1.2kVA Surface Mount Clockwise 1 1 Wire Termination 8.8kg 175 x 175 x 140mm 5A 140mm - 175mm
RS Stock No. 890-2840
BrandRS PRO
SGD439.48
Each
units
240V 0 → 240V 1.92kVA Surface Mount Clockwise 1 1 Wire Termination 7.8kg 165 x 165 x 140mm 8A 140mm 165mm 165mm
RS Stock No. 890-2844
BrandRS PRO
SGD571.38
Each
units
415V 0 → 415 V, 0 → 470 V 1.628kVA Surface Mount Clockwise 3 3 Wire Termination 9.1kg 110 x 110 x 330mm 2A 330mm - 110mm
RS Stock No. 117-6016
Mfr. Part No.MVT2.5k/9A-1
SGD258.14
Each
units
240V - 2.5kVA Panel Mount Clockwise 1 1 Clamp 15kg 185 (Ø) x 174mm - - 185mm 174mm
RS Stock No. 890-2771
BrandRS PRO
SGD363.37
Each
units
240V 0 → 240 V, 0 → 270 V 1.2kVA Surface Mount Clockwise 1 1 Wire Termination 6kg 175 x 175 x 102mm 5A 102mm - 175mm
RS Stock No. 890-2862
BrandRS PRO
SGD692.96
Each
units
240V ac 0 → 240V ac 720VA Stand Alone Clockwise 1 - Wire Termination 6kg 230 x 140 x 140mm 3A 140mm - 230mm
RS Stock No. 890-2866
BrandRS PRO
SGD723.87
Each
units
240V ac - 1.2kVA Stand Alone Clockwise 1 - Wire Termination 10kg 280 x 200 x 200mm 5A 200mm - 280mm
RS Stock No. 117-6015
Mfr. Part No.MVT1.4k/5A-1
SGD210.88
Each
units
240V - 1.4kVA Panel Mount Clockwise 1 1 Clamp 11kg 170 (Ø) x 176mm - - 170mm 176mm
RS Stock No. 122-6785
Mfr. Part No.MVTC-UK9A
SGD1,415.85
Each
units
240V - 2430VA Free Standing Clockwise 1 3 - 20.5kg 230 x 200 x 365mm - - - 230mm
RS Stock No. 890-2850
BrandRS PRO
SGD1,666.04
Each
units
415V 0 → 415 V, 0 → 470 V 8.14kVA Surface Mount Clockwise 3 3 Wire Termination 33.5kg 200 x 250 x 425mm 10A 425mm - 200mm
RS Stock No. 890-2853
BrandRS PRO
SGD1,315.63
Each
units
415V 0 → 415 V, 0 → 470 V 8.14kVA Surface Mount Clockwise 3 3 Wire Termination 27kg 175 x 175 x 410mm 10A 410mm - 175mm
RS Stock No. 117-6021
Mfr. Part No.MVT1.4k/5A-1E
SGD523.56
Each
units
240V - 1.4kVA Surface Mount Clockwise 1 1 - 13kg 275 x 210 x 270mm 13A - - 275mm
RS Stock No. 890-2800
BrandRS PRO
SGD496.03
Each
units
240V 0 → 240 V, 0 → 270 V 1.92kVA Surface Mount Clockwise 1 1 Wire Termination 8.8kg 175 x 175 x 170mm 8A 170mm - 175mm
RS Stock No. 890-2884
BrandRS PRO
SGD1,933.65
Each
units
240V ac - 2.4kVA Stand Alone Clockwise 1 - Wire Termination 12kg 270 x 210 x 200mm 10A 200mm - 270mm
RS Stock No. 890-2787
BrandRS PRO
SGD753.31
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