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Variable Auto Transformer

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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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