Provides perfectly stable output even under severe conditions of unbalanced voltage conditions. Ideal to protect the electrical and electronic equipments from high and low voltage.


  • Single Phasing Prevention
  • Output Electronic Over Load Protection
  • Phase Reversal Protection
  • Input Short Circuit Protection with MCB
  • Input Over Load Protection with MCB
  • Output Low Voltage Protection
  • Output High Voltage Protection
  • Audio Alarm for Protections


  • Mains Input on 3 LED Indications,
  • 3ph output on indication
  • Phase Reversal indication
  • over Load indication

Indications in LCD Display

  • Input High and Input low
  • Output on indication
  • Output high Cutoff and Output Low Cutoff

Programmable Parameters

  • Output voltage set ( 210-245V)
  • Output Low Voltage Cutoff
  • Output High Voltage Cutoff
  • Input Low on LCD Display
  • Input High on LCD Display
  • Sensitivity / Regulation
  • Over Load Cutoff
  • CT full scale

Programmable Control Timings

  • Over load Cutoff Time
  • Auto Restart Time
  • On & Off Delay Time

Programmable Controls

  • Display Scrolling – Auto / Manual
  • Start / Stop Buttons
  • Menu / Start / Stop / Reset / Log Button
  • Data Log: Last 100 fault events log with Date & Time stamp and works on FIFO basis.
  • Very Important For CSD
  • Analysis Problems

3 Phase Air Cooled Servo Controlled Voltage Stabilizers

Input voltage range 300 – 460v 340 – 480v 360 – 460v ac 3 ph
Output voltage(3 ph) 415v
Ac system unbalanced
wire r y b n
Connections star
Operating frequency 47 to 53 hz
Output voltage adjustable 380 to 415v ac in 3 ph
Output voltage regulation + 1% (no load)
Output voltage regulation + 1% (full load)
Overload capacity 120%
Correction rate 60 30 25v per sec-3 phase
Waveform distortion nil
Output waveform true
Reproduction of input insulation class f short circuit
Period & percentage 300% for 250 milli sec. 0 0 normal
Operation temperature 0 c to 45 c 0
Climate conditions 90% rh max.
Non condensing 35 c
Type of cooling natural air cooled up to 600 kva
Mode of system fully automatic system
Construction as per is – 9815 1994
  • 1.Quick response time 10 milli sec (half a cycle) very high efficiency above 98% excellent regulation as high as +- 0.5% micro controller
  • 2.Controlled system wide input range of operations & high speed of correction metering on lcd display
  • 3.3ph input voltage ph to ph and ph to neutral
  • 4.3ph output voltage ph to ph and ph to neutral system frequency
  • 5.Output current on each ph protections
  • 6.Single phasing prevention
  • 7.Output electronic over load protection
  • 8.Phase reversal protection
  • 9.Input short circuit protection with mcb
  • 10.Input over load protection with mcb
  • 11.Output low voltage protection
  • 12.Output high voltage protection
  • 13.Audio alarm for protections indications mains input on 3 led indications 3ph output on indication phase reversal indication over load indication