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Variacs

Autotransformers, another name for various, are a specific kind of electrical transformer with just one winding. The transformer winding serves as both the primary and secondary sides. Instead, the standard transformer type has two coils that are not electrically coupled. The one winding resolution enables the production of transformers that are smaller, lighter, and less expensive than conventional ones with two winds. They also have a higher VA rating for a given size and mass in addition to reduced leakage reactance, smaller losses, and lower excitation current. On the other side, there is no electrical shielding between circuits, which is a drawback. It may cause the output to receive the entire input voltage.

Frequently used Variacs/Autotransformers 

  • Power transmission and distribution – Variacs make sure that the voltage at the beginning and the end of the power distribution line are equal.
  • Power conversions – Various ensures to transform frequent domestic mains current bands that are in use around the world. For instance, 200 V to 250 V or 100 V to 130V.
  • Audio systems – Autotransformers are automated to adjust speakers to a fixed- voltage distribution and for matching preventing levels.

Applications 

Power transmission and distribution

In power applications, autotransformers are typically used to link systems that operate at several voltage classes, such as 132 kV to 66 kV for transmission. Making equipment designed (for instance) for 480 V supplies run on a 600 V supply is another use in industry. Additionally, they are frequently employed to provide conversions between the two home mains voltage bands that are most widely utilized worldwide (100 V-130 V and 200 V-250 V). The "Super Grid" connections in the UK between the 400 kV and 275 kV networks typically consist of three-phase autotransformers with taps at the common neutral end.

Audio system

Tapped autotransformers/Variacs are employed in audio applications to impedance matches, such as between a low-impedance microphone and a high-impedance amplifier input, and to adapt speakers to constant-voltage audio distribution systems.

Railways

It is typical for trains to be powered at 25 kV AC in railway applications. They can be set up to provide a split-phase 25-0-25 kV feed with the third wire (opposite phase) out of the reach of the train's overhead collection pantograph to extend the distance between energy Grid feeder stations. One 25 kV point of the supply is linked to the overhead contact wire, while the supply's 0 V point is attached to the rail. An autotransformer connects the contact wire to the rail and the second supply conductor (antiphase) at regular (10 km) intervals.

Autotransformer starter

Induction motors may be softly started using autotransformers. The Korndörfer starter is one of these starters' well-known designs.

Functions 

A single winding of an autotransformer has two end terminals and one or more terminals at the intermediate tap points. It is a transformer with shared turns between the main and secondary coils. The common part of the winding is the area that both the primary and secondary share. The series part of the winding is the area that is not shared by the main and secondary. Two of the terminals get the principal voltage. Two terminals are used to supply the secondary voltage, one of which is often shared with a primary voltage terminal.

Enrgtech is an electrical and electronic innovative equipment provider around the world. Our Variacs are 100% guaranteed, are composed of refined materials, and are well-designed. We value our customers in the sense of assisting them in choosing the excellent Variacs on our online platform. 


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Carroll & Meynell
Rohs Verified
MVT4.2k/5A-3E, Carroll & Meynell
1 In Stock
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1 +
£ 1587.38
Carroll & Meynell
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MVT4.9k/18A-1, Carroll & Meynell
2 In Stock
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1 +
£ 523.63
Carroll & Meynell
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MVT1k/3.5A-1E, Carroll & Meynell
67 In Stock
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£ 1042.14
Carroll & Meynell
Rohs Verified
MVT14.7k/18A-3, Carroll & Meynell
2 In Stock
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1 +
£ 2280.48
Carroll & Meynell
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MVT1.4k/5A-1E, Carroll & Meynell
86 In Stock
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£ 1037.07
Carroll & Meynell
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MVTC-UK9A, Carroll & Meynell
2 In Stock
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£ 1913.73
Carroll & Meynell
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MVT4.2k/5A-3, Carroll & Meynell
2 In Stock
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£ 1288.45
Carroll & Meynell
Rohs Verified
MVT4.9k/18A-1E, Carroll & Meynell
26 In Stock
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£ 1320.96
Carroll & Meynell
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MVT9.9k/12A-3E, Carroll & Meynell
1 In Stock
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£ 2555.31
Carroll & Meynell
Rohs Verified
MVT1.4k/5A-1, Carroll & Meynell
21 In Stock
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£ 291.81
Carroll & Meynell
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MVT14.7k/18A-3E, Carroll & Meynell
1 In Stock
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£ 3116.10
Carroll & Meynell
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MVT2.5k/9A-1, Carroll & Meynell
1 In Stock
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£ 406.51
Carroll & Meynell
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MVT2.5k/9A-1E, Carroll & Meynell
1 In Stock
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£ 1116.03
Carroll & Meynell
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MVTC-UK5A, Carroll & Meynell
1 In Stock
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£ 1806.11
Carroll & Meynell
Rohs Verified
MVT3.3k/12A-1E, Carroll & Meynell
69 In Stock
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£ 1132.69
Carroll & Meynell
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MVT3.3k/12A-1, Carroll & Meynell
1 In Stock
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£ 419.95
Carroll & Meynell
Rohs Verified
MVT0.3/1.1A-1, Carroll & Meynell
2 In Stock
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£ 197.70
Carroll & Meynell
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MVT1k/3.5A-1, Carroll & Meynell
2 In Stock
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£ 226.19
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New Items
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MVTC-UK5A, Carroll & Meynell

MVTC-UK5A, Carroll & Meynell

Carroll & Meynell MVTC Carryvolt Transformers 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 carryvolt internally contains a round carbon brush for smoother operation and a long life. Features Output sockets and test sockets Output Voltmeter and Ammeter Power on indicator Low current density in round carbon brush. Low Magnetising Current Rugged Construction. Negligible Maintenance and trouble free long life Thermal magnetic circuit breaker on/off switch for overcurrent protection High Efficiency. No Waveform Distortion. Excellent Regulation. Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT9.9k/12A-3E, Carroll & Meynell

MVT9.9k/12A-3E, Carroll & Meynell

Carroll & Meynell 3 Phase Variable Transformers, Enclosed Carroll & Meynell 3 phase transformers(enclosed) provide a trouble free and efficient way of varying and controlling AC voltages. Variation of the output voltage is achieved by a rotating arm and a carbon brush that rolls around a winding commutator. These 3 phase variable autotransformers consist of three single phase variacs that are mounted on a common shaft and connected in the “star” vector configuration. The variacs are positioned so that the brush arms on each unit are matched. This new range of autotransformers uses round carbon brushes, riding out any imperfection which gives a smoother operation. The round Carbon brush should last the lifetime of the unit. Features High Efficiency. No Waveform Distortion. Excellent Regulation Centre tap in winding for buck-boost applications Rugged Construction. Low Operating Torque. Smooth and Linear Output Low current density in round carbon brush. Low Magnetising Current. Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT14.7k/18A-3, Carroll & Meynell

MVT14.7k/18A-3, Carroll & Meynell

Carroll & Meynell 3 Phase Vairiable Transformers Carroll & Meynell 3 phase transformers provide a trouble free and efficient way of varying and controlling AC voltages. Variation of the output voltage is achieved by a rotating arm and a carbon brush that rolls around a winding commutator. These 3 phase variable autotransformers consist of three single phase variacs that are mounted on a common shaft and connected in the “star” vector configuration. The variacs are positioned so that the brush arms on each unit are matched. This new range of autotransformers uses round carbon brushes, riding out any imperfection which gives a smoother operation. The round Carbon brush should last the lifetime of the unit. Features High Efficiency. No Waveform Distortion. Excellent Regulation Centre tap in winding for buck-boost applications Rugged Construction. Low Operating Torque. Smooth and Linear Output Low current density in round carbon brush. Low Magnetising Current. Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT1.4k/5A-1, Carroll & Meynell

MVT1.4k/5A-1, Carroll & Meynell

Carroll & Meynell MVT Open Transformer 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 carbon brushes last the lifetime of the unit and are more robust than standard rectangular brushes, which are susceptible to breakages. These variacs have high efficiency and excellent regulation with no waveform distortion. Features A round carbon brush offers low current density Low magnetising current Robust construction Low operating torque Smooth output and linear output Centre tap in winding for buck–boost applications Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT2.5k/9A-1E, Carroll & Meynell

MVT2.5k/9A-1E, Carroll & Meynell

Carroll & Meynell MVT Enclosed Transformer 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 carbon brushes last the lifetime of the unit and are more robust than standard rectangular brushes, which are susceptible to breakages. These variacs have high efficiency and excellent regulation with no waveform distortion. This transformer includes new enclosures and an integral switch and a carry handle which allows the variac to stand upright or on its back. The side box which can be removed also incorporates the M6 terminals studs for connection of the output cable, or the connection you require. Features A round carbon brush offers low current density Low magnetising current Robust construction Low operating torque Smooth output and linear output Centre tap in winding for buck–boost applications input lead with 13A UK plug Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT4.2k/5A-3E, Carroll & Meynell

MVT4.2k/5A-3E, Carroll & Meynell

Carroll & Meynell 3 Phase Variable Transformers, Enclosed Carroll & Meynell 3 phase transformers(enclosed) provide a trouble free and efficient way of varying and controlling AC voltages. Variation of the output voltage is achieved by a rotating arm and a carbon brush that rolls around a winding commutator. These 3 phase variable autotransformers consist of three single phase variacs that are mounted on a common shaft and connected in the “star” vector configuration. The variacs are positioned so that the brush arms on each unit are matched. This new range of autotransformers uses round carbon brushes, riding out any imperfection which gives a smoother operation. The round Carbon brush should last the lifetime of the unit. Features High Efficiency. No Waveform Distortion. Excellent Regulation Centre tap in winding for buck-boost applications Rugged Construction. Low Operating Torque. Smooth and Linear Output Low current density in round carbon brush. Low Magnetising Current. Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT4.9k/18A-1, Carroll & Meynell

MVT4.9k/18A-1, Carroll & Meynell

Carroll & Meynell MVT Open Transformer 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 carbon brushes last the lifetime of the unit and are more robust than standard rectangular brushes, which are susceptible to breakages. These variacs have high efficiency and excellent regulation with no waveform distortion. Features A round carbon brush offers low current density Low magnetising current Robust construction Low operating torque Smooth output and linear output Centre tap in winding for buck–boost applications Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT3.3k/12A-1E, Carroll & Meynell

MVT3.3k/12A-1E, Carroll & Meynell

Carroll & Meynell MVT Enclosed Transformer 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 carbon brushes last the lifetime of the unit and are more robust than standard rectangular brushes, which are susceptible to breakages. These variacs have high efficiency and excellent regulation with no waveform distortion. This transformer includes new enclosures and an integral switch and a carry handle which allows the variac to stand upright or on its back. The side box which can be removed also incorporates the M6 terminals studs for connection of the output cable, or the connection you require. Features A round carbon brush offers low current density Low magnetising current Robust construction Low operating torque Smooth output and linear output Centre tap in winding for buck–boost applications input lead with 13A UK plug Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT1.4k/5A-1E, Carroll & Meynell

MVT1.4k/5A-1E, Carroll & Meynell

Carroll & Meynell MVT Enclosed Transformer 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 carbon brushes last the lifetime of the unit and are more robust than standard rectangular brushes, which are susceptible to breakages. These variacs have high efficiency and excellent regulation with no waveform distortion. This transformer includes new enclosures and an integral switch and a carry handle which allows the variac to stand upright or on its back. The side box which can be removed also incorporates the M6 terminals studs for connection of the output cable, or the connection you require. Features A round carbon brush offers low current density Low magnetising current Robust construction Low operating torque Smooth output and linear output Centre tap in winding for buck–boost applications input lead with 13A UK plug Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT4.2k/5A-3, Carroll & Meynell

MVT4.2k/5A-3, Carroll & Meynell

Carroll & Meynell 3 Phase Vairiable Transformers Carroll & Meynell 3 phase transformers provide a trouble free and efficient way of varying and controlling AC voltages. Variation of the output voltage is achieved by a rotating arm and a carbon brush that rolls around a winding commutator. These 3 phase variable autotransformers consist of three single phase variacs that are mounted on a common shaft and connected in the “star” vector configuration. The variacs are positioned so that the brush arms on each unit are matched. This new range of autotransformers uses round carbon brushes, riding out any imperfection which gives a smoother operation. The round Carbon brush should last the lifetime of the unit. Features High Efficiency. No Waveform Distortion. Excellent Regulation Centre tap in winding for buck-boost applications Rugged Construction. Low Operating Torque. Smooth and Linear Output Low current density in round carbon brush. Low Magnetising Current. Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVTC-UK9A, Carroll & Meynell

MVTC-UK9A, Carroll & Meynell

Carroll & Meynell MVTC Carryvolt Transformers 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 carryvolt internally contains a round carbon brush for smoother operation and a long life. Features Output sockets and test sockets Output Voltmeter and Ammeter Power on indicator Low current density in round carbon brush. Low Magnetising Current Rugged Construction. Negligible Maintenance and trouble free long life Thermal magnetic circuit breaker on/off switch for overcurrent protection High Efficiency. No Waveform Distortion. Excellent Regulation. Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
New items
MVT1k/3.5A-1E, Carroll & Meynell

MVT1k/3.5A-1E, Carroll & Meynell

Carroll & Meynell MVT Enclosed Transformer 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 carbon brushes last the lifetime of the unit and are more robust than standard rectangular brushes, which are susceptible to breakages. These variacs have high efficiency and excellent regulation with no waveform distortion. This transformer includes new enclosures and an integral switch and a carry handle which allows the variac to stand upright or on its back. The side box which can be removed also incorporates the M6 terminals studs for connection of the output cable, or the connection you require. Features A round carbon brush offers low current density Low magnetising current Robust construction Low operating torque Smooth output and linear output Centre tap in winding for buck–boost applications input lead with 13A UK plug Variable Auto Transformers Continuously variable alternating current (a.c.) output voltage Rugged construction Low operating torque High efficiency/excellent regulation Silver-plated commutator Low magnetising current No waveform distortion, smooth linear output & overload capacity Screw terminals Complete with knob and dial
FAQs
We offer free shipping for orders over £200 if delivery is in the UK. All other orders in the UK, shipping from £7.99 depending on the weight and measurement. Mainland Europe shipping charges start from £25. For all other countries shipping charges start from £50 for products like Variacs and all others.
You can email us directly at sales@enrgtech.co.uk or via our website for any queries regarding Variacs or any other product.
This depends on the Variacs individual product and information that can be found on our website.
Yes, we offer special discounts on orders above £200 for Variacs and all other products.
UK orders normally take between 2/3 working days. International orders normally take between 3/5 working days for all products including Variacs.
Yes. We keep updating our stock frequently and if a product like Variacs is not in stock then we will let you know.