Power Line Servo

Variable Auto Transformer

Variac or variable auto transformer manufactured by Powerline is available with AC control voltage controls that offer continuous AC voltage supply. Variac ensures a distortion free output that is suitable for sensitive electronic appliances and equipments in residential areas and industries. Manufactured with cutting-edge technology, these auto transformers ensure a consistent linear regulation of AC voltage to provide high output and negligible waveform distortion. It is suitable way of controlling current, light, heat and motor speed with a voltage factor. This transformer finds its wide applications in Auditorium, hotels, conference hall, laboratories, College & universities, Welding equipments, Servo stabilizer, rectifiers, battery charger and Testing instruments.


  • There is a single layer winding on toroidal core of high-grade cold rolled grain oriented (CRGO) steel
  • A special durable contact surface is made on one side of the copper winding and a specially finished carbon brush slide smoothly on the surface
  • A contact arm with a carbon brush is fitted on the centre shaft
  • As the control knob is rotated, the carbon brush slides over the winding


  • Can enhance the output voltage in excess of twice the input voltage
  • Any desired voltage within the maximum range can be obtained by adjusting the carbon brush
  • Calibrated dial show approximately output voltage at no load
  • The contact arm can be moved both manually and by motor
  • Delivers an output voltage from 0 to above line voltage
  • Constructed with 99.9% pure copper
  • High grade CRGO steel is used for constructing coils
  • Low temperature rise
  • Wide assortment of current rating 4 Amp. To 1200 Amp
  • Spare carbon brushes provided up to 28 Amp
  • High quality carbon brush
  • Step-less voltage control
  • Short time overload capacity
  • Maintenance cost


  • Auditorium, hotels, conference hall, laboratories etc.
  • Servo stabilizer, rectifiers, battery charger
  • Welding equipments
  • Testing instruments
  • College & universities

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