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.

...
Read more Read less

Filters

Viewing 1 - 20 of 49 products
Results per page
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. 890-2828
BrandRS PRO
SGD167.26
Each
units
240V 0 → 240V 240VA Surface Mount Clockwise 1 1 Wire Termination 1.6kg 86 x 99 x 110mm 1A 110mm 87mm 113mm
RS Stock No. 890-2816
BrandRS PRO
SGD337.69
Each
units
240V 0 → 240 V, 0 → 270 V 4.8kVA Surface Mount Clockwise 1 1 Wire Termination 15.3kg 225 x 225 x 190mm 20A 190mm - 225mm
RS Stock No. 890-2831
BrandRS PRO
SGD243.76
Each
units
240V 0 → 240V 480VA Surface Mount Clockwise 1 1 Wire Termination 3.1kg 113 x 130 x 127mm 2A 127mm 113mm 113mm
RS Stock No. 890-2799
BrandRS PRO
SGD191.39
Each
units
240V 0 → 240 V, 0 → 270 V 170VA Surface Mount Clockwise 1 1 Wire Termination 1.9kg 160 x 130 x 160mm 0.7A 160mm - 160mm
RS Stock No. 117-6014
Mfr. Part No.MVT1k/3.5A-1
SGD175.16
Each
units
240V - 1kVA Panel Mount Clockwise 1 1 Clamp 8kg 155 (Dia.) x 176mm - - 155mm 176mm
RS Stock No. 890-2793
BrandRS PRO
SGD228.32
Each
units
240V 0 → 240 V, 0 → 270 V 480VA Surface Mount Clockwise 1 1 Wire Termination 3.8kg 160 x 130 x 160mm 2A 160mm - 160mm
RS Stock No. 890-2765
BrandRS PRO
SGD137.85
Each
units
240V 0 → 240 V, 0 → 270 V 170VA Surface Mount Clockwise 1 1 Wire Termination 1.4kg 83 x 80mm 0.7A 96mm 83mm 80mm
RS Stock No. 890-2856
BrandRS PRO
SGD658.03
Each
units
415V 0 → 415 V, 0 → 470 V 1.628kVA Surface Mount Clockwise 3 3 Wire Termination 12.9kg 150 x 200 x 330mm 2A 330mm - 150mm
RS Stock No. 890-2774
BrandRS PRO
SGD193.44
Each
units
240V 0 → 240 V, 0 → 270 V 480VA Surface Mount Clockwise 1 1 Wire Termination 2.9kg 110 x 110 x 95mm 2A 95mm - 110mm
RS Stock No. 890-2894
BrandRS PRO
SGD11.80
Each
units
- - - Surface Mount - - - Wire Termination 10g 12.5 x 3 x 16mm - 16mm - 12.5mm
RS Stock No. 890-2838
BrandRS PRO
SGD352.35
Each
units
240V 0 → 240V 960VA Surface Mount Clockwise 1 1 Wire Termination 5.6kg 165 x 165 x 120mm 4A 120mm 165mm 165mm
RS Stock No. 890-2822
BrandRS PRO
SGD177.43
Each
units
240V 0 → 240V 360VA Surface Mount Clockwise 1 1 Wire Termination 2.6kg 113 x 130 x 127mm 1.5A 127mm 113mm 113mm
RS Stock No. 890-2834
BrandRS PRO
SGD272.01
Each
units
240V 0 → 240V 720VA Surface Mount Clockwise 1 1 Wire Termination 3.5kg 113 x 130 x 127mm 3A 127mm 116mm 113mm
RS Stock No. 890-2897
BrandRS PRO
SGD3.03
Each
units
- - - Surface Mount - - - Wire Termination 5g 6 x 2.5 x 10mm - 10mm - 6mm
RS Stock No. 890-2780
BrandRS PRO
SGD378.20
Each
units
240V 0 → 240 V, 0 → 270 V 1.92kVA Surface Mount Clockwise 1 1 Wire Termination 7.8kg 175 x 175 x 130mm 8A 130mm - 175mm
RS Stock No. 890-2777
BrandRS PRO
SGD264.55
Each
units
240V 0 → 240 V, 0 → 270 V 720VA Surface Mount Clockwise 1 1 Wire Termination 3.5kg 110 x 110 x 115mm 3A 115mm - 110mm
RS Stock No. 890-2890
BrandRS PRO
SGD9.86
Each
units
- - - Surface Mount - - - Wire Termination 7g 9.5 x 2.5 x 14mm - 14mm - 9.5mm
RS Stock No. 890-2803
BrandRS PRO
SGD308.94
Each
units
240V 0 → 240 V, 0 → 270 V 720VA Surface Mount Clockwise 1 1 Wire Termination 4.3kg 160 x 130 x 160mm 3A 160mm - 160mm
RS Stock No. 122-6784
Mfr. Part No.MVTC-UK5A
SGD1,103.15
Each
units
240V - 1350VA Free Standing Clockwise 1 3 Wire Termination 16.5kg 230 x 200 x 365mm - - - 230mm
RS Stock No. 890-2783
BrandRS PRO
SGD471.51
Each
units
240V 0 → 240 V, 0 → 270 V 2.4kVA Surface Mount Clockwise 1 1 Wire Termination 8.5kg 175 x 175 x 135mm 10A 135mm - 175mm
Related Products
Carroll & Meynell variable autotransformers have variable voltages ...
Description:
Carroll & Meynell variable autotransformers have variable voltages and are ideal for controlling AC voltages. The rotating arm with a carbon brush changes the output voltage.These variacs feature round carbon brushes, riding any imperfections, offering a smoother operation. The round ...
Carroll & Meynell Carryvolt autotransformer is an ideal ...
Description:
Carroll & Meynell Carryvolt autotransformer is an ideal piece of portable test equipment for varying supply voltage. These carryvolt transformers have three optional output sockets to connect to the items being tested, they also incorporate meters for general indication. The ...
Professional range of open style variable transformers available ...
Description:
Professional range of open style variable transformers available in either single or three phase. The transformers are not designed to provide mains isolation but do operate at mains voltage. The transformers need to be fitted within an enclosure or a ...
Professional range of enclosed variable transformers available in ...
Description:
Professional range of enclosed variable transformers available in either single or three phase. The transformers are not designed to provide mains isolation but do operate at mains voltage. All of the transformers need to be earthed using the earth studs ...