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3 Phase Variable Auto Transformer

3 Phase Variable Auto Transformer
3 Phase Variable Auto Transformer
Product Code : 09
Brand Name : Servo Stabilizer India PVT. LTD.
Product Specification

3 Phase Variable Auto Transformer

We are endowed with a state-of-the-art infrastructural facility which back us in manufacturing and supplying 3 Phase Variable Auto Transformer. We manufacture this transformer using high quality materials and components, sourced from authentic vendors. It is an energy saving electrical transformer which can convert the voltage as required. Available in different sizes and technical specifications, our 3 Phase Variable Auto Transformer is highly demanded in the market. We offer this transformer at cost effective prices to clients.

Key Features:

Continously Variable Voltage Auto Transformer is the most effective device for stepless, breakless & continous control of AC voltage & therefore for various parameters, dependent on AC voltage.

These Variable Voltage Auto Transformers, consists of a single layer winding on a toroidal silicon-steel core. As the control knob is rotated, a carbon brush traverses the winding, tapping off a portion of the total voltage across the winding. The brush is in continous contact with the winding. The discrete voltage increments obtained as the knob is rotated are always less than the voltage between turns. Since the brush spans more than one turn, the change in voltage is practically continuous. As output voltage is continously variable, Variable Voltage Auto Transformers are rated in terms of current that can be drawn from the output.

The basic Continously Variable Voltage Auto Transformers is meant for operation from a nominal input voltage of 240 V I ph AC & can give output voltage anywhere between 0 to 240 v or 0 to 270V AC by simple transformer action. Three such Variable Voltage Auto Transformers connected electrically in star and mechanically in tandem, become suitable for operation from a nominal input voltage of 415V 3Ph AC and can give output anywhere between 0 to 415V or 0 to 470V.

Rating Available: 4 Amps- 1600 Amps



a)Flush Open Manual (Air Cooled) – F

b)Portable Enclosed Manual (Air Cooled) – P

c)In Tank Manual (Oil Cooled) – T 'F' , 'P' , T suffixed by 'M' means motor operated models.


For Single Phase – 240V AC, 50-60 Hz. I- ph.

For Three Phase – 415V AC, 50-60 Hz., 3 – ph – 4wire.


For Oil Cooled models, maximum current & continuous current are Appx. One & the same.

For Air Cooled models. The power Factor is Appx. 0.8


0o - 45oC


Not less than 5M ohms at 500V DC.


2.5KV RMS for 1 Minute.


- 9oC to 70oC


Upto 95% RH


I.S. 5142.



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