2-3500 kVA


Servo controlled voltage regulations most widely used method in voltage regulation. We manufacture from 1 kVA to 50 kVA single-phase, from 2 kVA to 3500 kVA three-phase.

The voltage stabilizer basically consists of a variable transformer a servo motor that controls the variable transformer through a gear drive mechanism, a buck-boost transformer electronic circuit, and a sheet iron box that includes all.

Servo-controlled voltage regulator’s operation is based on feedback and comparison processes. Any voltage fluctuation in the network can be easily stabilized with the help of high response capability and ac/dc motor mechanism which have high start-up torque, even if the variation is very little.

Precision micro-switches are used as end limits for cutting off the energy of the motor when input voltage exceeds the regulation.

Output is sinewave with no distortion or interference in network frequency during operation.


The voltage stabilizer is designed to control and regulate the level of tension that comes from the main network (AEC). Each stage is equipped with a built-in microprocessor controller able to control the pressure and the flow and make necessary adjustments to maintain tension in the appropriate values.


The mechanical construction of our voltage stabilizers has been designed in industrial type, to monitor the voltage in an easy operating system. Electrical connections have been constructed in a simple modular design so that the service and maintenance of the device can be performed easily.

Servo Motor Controlled Technology

Servomotors are generally used as a high performance  alternative to ac/dc controlled stepper motor. Stepper motors have some inherent ability to control position, as they have built-in output steps. This often allows them to be used as an open-loop position control, without any feedback encoder, as their drive signal specifies the number of steps of movement to rotate. Our AVR-X logic card check online signals of voltage fluctuation and manage servo motors to make stable output voltage.

2-3500 kVA


Available voltages: 220-400, 275-435, 310-450 VAC

2-3500 kVA


Available voltages: 130-230, 160-250, 180-270 VAC

By-pass system

This device is equipped with a by-pass system that in case of failure can automatically disconnect the voltage stabilizer. The by-pass system saves your voltage stabilizer from suffering any damage.

Input circuit breaker

  • The entries of the voltage stabilizer are protected with an input circuit breaker.
  • This equipment for every voltage movement with wide range operates with
    maximum speed 200 V/sec. This helps to achieve maximum stabilization of the voltage.
    The output voltage has a tolerance with high efficiency ± 1% till 1.5%.
  • The microprocessor system has been designed to stabilize the voltage coming from the mains with maximum efficiency.
  • Phases are independent from each other and give stabilized voltage for each phase.
  • This control is performed by the microprocessor card when the voltage is out of the normal range.


  • Servo Motor Controlled Technology
  • Fast Response for Fluctuations
  • Reliable Stabilization for Secure Energy
  • High efficiency in each model
  • Short circuit protection
  • Ability to work with non-linear loads
  • Manual Bypass Switch
  • Wide input voltage range version (optional)
  • Electro-mechanic (breaker module) high-low voltage protection
  • Output Isolation Transformer (optional)
  • Digital Display AVR-X technology
  • Higher IP applications are available
  • Phase Independent Voltage Regulation for Three Phase Models
  • Surge Arrester option available


The AVR-X is a next generation voltage regulator control unit combining multi-functionality and wide communication possibilities together with a reliable and low cost design. The unit complies and mostly exceeds world’s tightest safety, EMC, vibration and environmental standards for the industrial category. Software features are complete with easy firmware upgrade process through USB port. The Windows based PC software allows monitoring and programming through USB, RS-485,Ethernet and GPRS. The PC based Rainbow Scada software allows monitoring and control of an unlimited number of regulators from a single central location.


  • Ethernet (optional)
  • GSM-GPRS (optional)
  • WiFi (optional)
  • Embedded web server
  • Web monitoring
  • Web programming
  • E-mail
  • Modbus RS-485 (optional)
  • Modbus RS-232 (optional)
  • Modbus TCP/IP
  • SNMP
  • USB


  • Regulation with servo motor control
  • Static regulator control (option)
  • Remote display & control unit
  • Waveform display of V & I
  • Harmonic analysis of V & I


  • 3 phases 4 wires, star
  • 2 phases 3 wires, L1-L2
  • 1 phase 2 wires

Request quotes