Servo Controlled Automatic Voltage Regulators

The hazards of over-voltage are well known and these voltage fluctuations constitute a serious problem for users of most of the electrical equipments. Servo controlled AVR's are designed and manufactured by us for the healthy operation of sophisticated equipments. Our Electro Servo Motor Controlled AVAR’s are high speed electromechanical regulators, manufactured from the highest quality raw materials available. Superior transformer design and top quality raw material used in our Servo’s makes them highly efficient in handling any voltage fluctuations in the main supply

Key features

  • We design both double wound and buck boost type servo as per the requirement
  • Our buck boost transformers are manufactured with glass ware insulated copper with magnesil mitter core for best results.
  • Digital and Solid state control circuitry are used.
  • In oil cooled servo, we provide oil indicator with temperature meter.
  • Energy savings due to high efficiency and superior transformer design.
  • No wave form distortion.
  • High speeds of correction up to 35V/sec for three phase and 20V/sec for single phase.
  • Machine wound variacs with special carbon brushes for enhanced life.
  • Simple, systematic construction for dependability and ease of maintenance.
  • Conforms to IS: 9815 specification.


Single Phase Three Phase
Input Volts* 100-260V 200-440
Output Volts* 230 +/- 1% 380/400/415 +/-1%
Efficiency >95% >98.5%
Frequency 48-52 Hz 48-52 Hz
Wave Form Distortion Nil Nil
Temperature Depends on type of cooling and IS Specifications
Environment Designed for indoor tropical use


How to choose a Servo Stabilizer

  • There can be three types of loading conditions in an electrical system
    • All the loads are of three-phase nature.
    • There is a mixture of three-phase and single-phase loads.
    • All the loads are of single-phase nature.
  • In view of the above facts and the guiding principle, the choice of a three phase stabilizer for condition (a) and (b) falls on balanced load type stabilizer.
  • An unbalanced load type stabilizer should be used only for option (c)

The neutral needs to be solidly grounded for proper functioning of the electrical system.

APPLICATIONS in main line of:

Banks and offices
CNC Machines Air Conditioning Plants
Telecommunication Networks Motor Loads
Data Processing Equipment Bio Medical Equipment
Drives, PLC's Induction Heating
Hotels Defense Application
Industrial Units Lighting Loads
Residential Farm Houses
R & D Institutions Sophisticated Laboratories


  • Low/High voltage trip
  • Short Circuit Protection
  • Single Phasing Protection
  • Input/Output Voltage Metering
  • Reverse Phase Protection
  • Isolation Transformer
  • Silica Gel breather
  • Change over Switch
  • Oil drain valve

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Some Of Our Clients