JINDAL'S Automatic Voltage Controllers provide foolproof protection against High / Low / Unbalanced Voltage. Jindal's AVC resolves 99% of voltage problems automatically and ensures a steady voltage supply round the clock. They are known for their rugged built and maintenance-free performance.
Jindal's AVC's are trusted in more than 35 countries across 5 continents.

General Trend of Voltage During Day Time

9:00 to 12:00 Hrs. 12:00 to 14:00 Hrs.
Lunch Hours
14:00 to 18:00 Hrs. 18:00 to 22:00 Hrs.
Peak Hours Restriction
22:00 to 5:00 Hrs. 5:00 to 9:00 Hrs.
340 V - 400V 400 V - 440V 340 V - 400V 400 V - 430V 400 V - 470V 400 V - 450V
Voltage fluctuation is a common phenomenon in every part of the country. The industrial units running round the clock, usually face the problem of low and high voltage. 90% of industrial load motors . Electric motors draw considerably high current at low & high voltage. This higher current affects the electrical motors ( particularly smaller capacity motors upto 7.5 H.P.) in three ways:
  • Higher current produces higher losses in electrical motors which causes premature failure winding.
  • These higher losses of electric motors also increase the losses of cables, switches,  transformers and other associated equipments.
  • For smooth continuous operation of motors, overload relays are usually set at 20% higher setting.

Adverse Effects of Single Phasing

  • The line current increases by 1.5 times.
  • If the relay setting is at 15-20% higher than actual operating current then the relay will take 4-6 minutes to trip.
  • The motor ( particularly smaller capacity motors upto 7.5 H.P) cannot withstand this high current for such a long time and in most of the cases it burns out before the relay trips.
  • Heavy short circuit current flows through the relays, contactors, cable etc.
  • Under this condition when the relay, contactor trips, they produce sparks and some times burst.
  • This further damages the switch gear and in some of the cases may cause fire also.
With the installation of the stabilizer and maintaining 390/400 volts, the motor will operate smoothly drawing 15-20% lesser current and correspondingly the relay setting can be reduced by 15-20% In case single phasing occurs, the relay will trip in 40-50 seconds. The motor can withstand the high current fot this period and will be safe. Also, the relays, contactors, switchgears, etc. incorporated with the motor will be safe

If your unit is suffering from low / high / unbalanced voltage, you need to install a stabilizer soon. Industrial units having acute / higher failure rates of Electrical Equipment such as bulbs, tubes, chokes, starter, contactor coils, motors, etc., should verify that it may be due to voltage variation (esp. high voltage). You may note down hourly readings of incoming voltage for a few days continuously. If you find that input voltage is lower or higher than 230V (single ph) / 400V (3-phase) even for a few hours a day, then you definitely require a stabilizer. Call our Engineer for Free On-Site Voltage Analysis.

  • Up to 80% reduction in failure rate of electrical equipment
  • Energy saving up to 10% (up to 30% on lighting load)
  • Reduction in MDI
  • Improvement in Power factor
  • Uniform quality of end products
  • Improves Productivity of the plant
  • Depreciation @ 40% as per Income Tax Act (In India)
           being an energy saving device.

JINDAL'S AVC are available in a wide range & various models. Besides, we also manufacture bespoke designs as per specific customer requirements. The standard models conform to the following specifications:

Capacity 30 kVA to 5000 kVA
Technology Linear Type On-Load Voltage Regulators with Stepless Regulation
(also referred to as Vertical Rolling Contact or Columnar Design)
Control Module Microprocessor based
Frequency 50 / 60 Hz ± 5%
Type Balanced (Common Control for all three phases.
Suited for Balanced input supply & up to 40 % Unbalanced load)Unbalanced (Individual Phase Control. Suited For unbalanced input supply and unbalanced load)
Load Variation Admitted from 0 to 100%
Installation Indoor / Outdoor as per site requirement
Core CRGO Lamination Best Grade
Copper Electrolytic Grade (99.97% Pure)
Cooling Natural Oil-Cooled, ONAN (Available in all models)
Air-Cooled, Natural / Forced (available in select models)
Output Voltage 400V ± 1% (Ph – Ph) / 230V ± 1% (Ph – N)
Input Voltage
350 – 450V 340 – 460V 330 – 470V 320 – 480V 300 – 500V
*(wide & asymmetrical ranges are manufactured on order)
~ 99.5% > 99% ~ 99% ~ 98.5% > 98%
Duty Cycle / Life Designed for 100 % Continuous Duty Cycle &
for a life of 18 – 20 years at extreme conditions
Response Time Less than 10 milliseconds
Correction Rate 6 – 15  Volts / second (up to 500 kVA) and 3 – 8 Volts / second (above 500 kVA)
Waveform Distortion Virtually Nil
Ambient Temperature -10 to +45 °C
Mounting On Unidirectional Wheels
Termination Aluminium Bus – Bars provided for Input & Output in a common junction box
Optional Features High / Low / Over Load / Single Phase Preventer / Short Circuit / Surge Suppressor / Bypass As on Request

Jindal's AVC's not only stabilized incoming voltage fluctuations, but in the process also help save energy upto 30% and reduce breakdowns upto 80%. We ensures continuity in production and consistency in quality despite incoming voltage variations. Owing to its high efficiency and associated benefits, the pay-back period for the cost of our Servo Stabilizer is typically between 6 to 18 months, depending upon the nature and duration of load and the extent of voltage variation. And more often than not, it is simply avoiding a few minutes machine downtime or just one failure to recover the cost of the equipment.

Jindal’s AVCs are installed either along with the main Distribution Transformer / Panel to ensure stabilized voltage supply to entire plant & machinery / complex, or along with individual machines processes to hold voltage / current / power / temperature / lighting intensity constant. Our AVCs find wide application across all kinds of machines or industries / commercial / residential complexes.

Mines & Collieries Cement Plants Flour Mills Rice Shellers
Hotels & Restaurants Food Processing units Pharmaceutical Units Engineering Products
Hsopitals & Clinics Tea & Coffee Estates Paper Mills Cold Storages
Oil Plants Rubber Industries Textile Mills Warehouses
Rolling Mills Plastic Moulding High Rise Buildings Leather & Footwear
Vineyards & Poultry Farms Sponge Iron Units Breweries & Beverages Showrooms
Schools & Colleges Offices & Residences Shopping Malls Any kind of manufacturing

Download Catalogue for Automatic Voltage Controllers