Purevolt Products Private Limited
Purevolt Products Private Limited
Okhla Industrial Area, New Delhi, Delhi
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Variable Auto Transformer

We are a leading Manufacturer of variable auto transformer, variable transformer, variable voltage transformer and dc variable auto transformer from New Delhi, India.

Variable Auto Transformer

Variable Auto Transformer
  • Variable Auto Transformer
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Approx. Price: Rs 4,000 / PieceGet Latest Price
Advantages & Features of Auto Transformers:

Continuously Variable Toroidal Transformers have many operating advantages and conveniences
over other manually operated voltage control devices for alternating current use.
Some of the features are mentioned below :

Smooth Control:
The Variac / dimmerstat can be set to any output voltage within its range. Output voltage is continuously adjustable from zero to maximum. As voltage between turns is small and as the bush arm is in constant contact with more than one turn, harmful sparkling is avoided and output can be set very easily to a fraction of a volt from zero onwards by rotation of the knob.

Low Operating Torque :
A glass smooth commutator, special sintered bushings for the shaft and perfect assembling of the coils, result in low operating torque for our auto-transformers.

Small Size:
The variable Auto Transformers is much smaller than any other type of control of equal rating
Better Efficiency:
Very low losses under all loud conditions. Toroidal Variable Auto Transformer have low-loss grain oriented strip wound cores. Careful copper core selection and design assures the user of low watt loss as compared to other types of controllers.

No wave form distortion:
Our variacs provide an output voltage wave from which is a faithful and distortion less replica of the input voltage wave form.

Better Regulation:
Output voltage is substantially independent of loud. The drop in voltage from ‘no load’ to ‘full load’ is minimal in our variacs.

Linear Output Volts:
Output Voltage varies linearly with angle of rotation of control knob.

Temperature rise:
Less than 50 deg.C for continuous duty.

Advanced Design:
Excellent electrical specification is matched by rugged, compact construction. Brush replacement is simple and convenient. Two, three or more units can be ganged on one shaft for series, parallel or three-phase operation.

Long Life:
When used correctly the Variacs has a very long operating life. The life of a Variacs is essentially the same as that of any standard fixed ratio power transformer.
Rugged Construction:
Our variacs are designed for heavy duty trouble free operations. All components are designed to give maximum life to the unit under extreme operating conditions.

Low Magnetic Current:
By using an adequate section of the high quality grain oriented silicon steel, the iron losses are controlled to the minimum. The no load current is invariably less than 1% of the rated current.

Rating Available: 2 Amp to 1800 Amp
Air / Oil Cooled and Single / Three Phase
(Special ranges also available on request)

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  • Pay Mode Terms: L/C (Letter of Credit),T/T (Bank Transfer)
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Variable Transformer

Variable Transformer
  • Variable Transformer
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Approx. Price: Rs 4,000 / PieceGet Latest Price

Technical Specifications of Variable Transformer :

  • Rated for 240V A.C. 50/60Hz. single phase supply and three phase model for 415V A.C. 50/60Hz three phase 4 wire supply.
  • The output voltage of these Toroidal or variable transformer can be varied smoothly over two ranges:

    • Zero to full supply voltage
    • Zero to approx. 12% higher than the supply voltage
  • These auto transformers or dimmers are Suitable for indoor use on maximum ambient temperature of 45oC.
  • Variable Auto Transformers - VARIAC are rated to work at 240 volts Input and supply 0-270Volts output. Similarly, three 240-volt units are ganged in a star connection to result in a 470-volt line-to-line three-phase assembly. For 480-volt open delta applications, two 240-volt units are used in series in each of the two legs of the open delta assembly. In any of the above voltage applications, higher current requirements are met by paralleling two or more units in the ganged assembly.

Rating Available: 2 Amp to 1800 Amp
Air / Oil Cooled and Single / Three Phase
(Special ranges also available on request)

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Variable Voltage Transformer

Variable Voltage Transformer
  • Variable Voltage Transformer
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Approx. Price: Rs 3,000 / PieceGet Latest Price
Variacs or variable auto transformer is a Continuously variable voltage transformer, having a single layer winding on a toroidal core of high grade Steel.
In an variable voltage autotransformer portions of the same winding act as both the primary and secondary winding. the winding has at least three taps where electrical connections are made. One end of the winding is usually connected in common to both the voltage source and the electrical load. The other end of the source and load are connected to taps along the winding. Different taps on the winding correspond to different voltages, measured from the common end.
On one face of the copped winding, along the periphery, a special durable contact surface is made. A specially designed carbon brush slides smoothly on the surface. A contact arm holding the contact brush is fitted to the central shaft and as the control knob is rotated, the carbon brush slides over the winding and taps off a portion of voltage across the winding.

Any desired voltage within the maximum range can be obtained by adjusting the position of the brush. The calibrated dial reads approximately the output voltage at no-load, when the input is at its rated value. Rotation of the brush arm by manual of motor drive delivers an output voltage from zero to or above line voltage.

Variable Voltage auto Transformer, manufactured by Purevolt is the most useful and effective device for step less, break less and continuous control of A.C voltage and therefore, for control of various other parameters, dependent on A.C voltage. It is ideal controlling device for numerous applications in laboratories and in industrial & commercial fields.

The basic Variable Voltage auto Transformer is meant for operation off a nominal voltage of 240 V A.C & can give output voltage anywhere between 0 – 240 V or upto 290 V, by a simple transformer action. Three such Variable Auto transformer when connected electrically in star & mechanically in tandem, became suitable for operations of 415 V 3 Phase A.C. supply & to give output of 0 – 415 V or upto 470 V.

We can also provide you DC & AC Variable Auto Transformers Variacs with option of DC and AC output. We also provide additional features like MCCB, Motorized Operation, Remote Extension etc.

Rating Available: 2 Amp to 1800 Amp
Air / Oil Cooled and Single / Three Phase
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Additional Information:

  • Pay Mode Terms: L/C (Letter of Credit),T/T (Bank Transfer)
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DC Variable Auto Transformer

DC Variable Auto Transformer
  • DC Variable Auto Transformer
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Approx. Price: Rs 6,000 / PieceGet Latest Price
We are manufacturer and exporter of DC Variable Auto Transformer also called as DC Variacs and DC Dimmerstat which operates on a nominal voltage of 240 V A.C & can give output voltage anywhere between 0 – 290 V, by a simple transformer action.
We give provisions to supply DC Variable Voltages also.
These DC  Variable Auto Transformers can be used in various types of applications. They can be used to supply voltage adjustment, boosting of low lines and line voltage stabilization, either manually or automatically in automatic voltage stabilizers. Voltage and current control in development and experimental work. Some other applications are listed below :
  • DC Variacs for Over and under voltage testing of electrical and electronic equipment.
  • Heat control of ovens, furnaces, infra-red heaters etc…
  • Testing and calibration of voltmeters, ammeters, watt meters etc…
  • Built in as an integral control element in electrical, electronic and automatic control and process equipment.
  • Lighting control in theatres, auditoriums, hotels.
  • Restaurants, photographic studios and darkrooms etc...
  • Motor speed control either direct or through suitable circuits.
  • Control of DC voltage and current through rectifiers.
  • Control of rectifiers in electroplating etc

Rating Available : 2 Amp to 1800 Amp
Air / Oil Cooled and Single / Three Phase
(Special ranges also available on request)
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Additional Information:

  • Pay Mode Terms: L/C (Letter of Credit),T/T (Bank Transfer)
Yes! I am Interested
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Sumit Gupta (Managing Director)
D-9/6, Okhla Industrial Area Phase 1
New Delhi- 110020, Delhi, India



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