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Manual Variable Auto Transformer

Manual Variable Auto Transformer

Product Details:

  • Cooling Type Dry Type,Air Cooled and Oil Cooled
  • Product Type Electrical Transformer
  • Material Metal
  • Frequency (MHz) 50 Hertz (HZ)
  • Power Scope Electric
  • Supply Ability : 100 Piece Per Week

Price And Quantity

  • 4000 INR
  • 1 Piece

Product Specifications

  • Electric
  • 50 Hertz (HZ)
  • Metal
  • Electrical Transformer
  • Dry Type,Air Cooled and Oil Cooled

Trade Information

  • Letter of Credit (L/C), Cheque
  • 100 Piece Per Week
  • 2 Week
  • Box
  • Africa, Middle East
  • All India

Product Description

Manual Variable Auto Transformer

Backed with high technology facilities and machines, we have been able to manufacture and export a quality range of Manual Variable Auto Transformer. Supply voltage adjustment, boosting of low lines and line voltage stabilization in automatic voltage stabilizers. We manufacture this transformer using high quality materials and components. Clients can obtain this Manual Variable Auto Transformer in different technical specifications from us. Also, we offer this transformer at cost effective prices.

Key Features:

  • Comes with a sturdy and easy to use knob to increase or decrease the voltage as per requirement
  • Effective device for step less, break less and continuous control of ac voltage 
  • Ideal controlling device for numerous applications in laboratories and in industrial & commercial fields

Further Details:

We are a commendable manufacturer, supplier, exporter and trader of Manual Variable Auto Transformer Variac that are manufactured in both three and single phases. The general output range of the three phase is between 0 to 470 volts and in single phase it varies between 0 to 270 volt. Our engineers fabricate single or three phase enclosed type and open type Manual Variable Auto Transformer Variac  for mounting purpose. Our manual transformer comes with a sturdy and easy to use knob to increase or decrease the voltage as per requirement. Moreover, we also offer high output voltage product with attributes like enclosure, motorization, ammeter and voltmeter.

Rating Available: 2 Amp to 1200 Amp
1 & 3 Phase / Air & Oil Cooled Types
(Special Input and output Voltage ranges also available on request)


Continuously Variable Voltage Auto Transformer is the most effective device for step less, break less & continuous 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 continuous 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 continuously variable, Variable Voltage Auto Transformers are rated in terms of current that can be drawn from the output.

The basic Continuously 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


  • Simple, rugged construction.
  • Coils made from high grade CRGO Silicon Steel & Pure copper.
  • Variable DC Output can be given using Diodes & Rectifies.
  • Output voltage variation is smooth, continuous, break less & linearly proportional to angular rotation.
  • High efficiency.
  • Negligible waveform & power factor distortion.
  • Excellent short time overload capacity.
  • Remote operation possible by motorization.
  • Wide range of current ratings.
  • High quality carbon brush used for current collection.



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.


  • Single phase Variable Transformers are available in 3 types.
  • Potable type (P) with sheet steel enclosure for floor / table use.
  • Flush type (F) with open type construction. Suitable for panel mounting.
  • Tank type (T) immersed in oil in sheet steel tank with rollers.
  • Three phase Variable Transformers is usually ganged assembly of 3 coils, available in all 3 types: P,F,T.
  • Higher rating Continuously Variable Voltage Auto Transformers (above 200 Amps) use 2/3/4/5/6 or more coils in parallel with load balancing arrangements.
  • Tank type (T) immersed in oil in sheet steel tank with rollers.
  • Motorized Variable Transformers uses 240V AC Step-Syn Motor having 60 rpm speed at 50Hz. With proper gearing higher torque at lower speed can be achieved. Standard gear ratios used provide sweep time of 8, 15, 30, 45, 60, 120secs.


* Tips on getting accurate quotes. Please include product name, order quantity, usage, special requests if any in your inquiry.

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We are catering to top Indian cities such as New Delhi/NCR, Noida, Faridabad, Ghaziabad, Greater Noida, Alwar, Manesar.
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