Being a renowned Servo Stabilizer manufacturer in Ahmedabad, our “SERVO STABILIZERS” are specially designed and created to meet the perfect standards of industrial and commercial needs. The Servo Stabilizers manufactured with “ASHOK ELECTRICALS” are having outstanding mechanical strength, fire and moisture resistant capacity, with an ability to withstand heavy short circuit forces effectively and with a minimal chances of leakage and spikes in our product. Thus proving us to be one of the high rated Servo Stabilizer manufacturers assuring smooth machinery operations with our wide range of transformers.

Let us now take a close look at Servo Stabilizer specification, features and its advantages.


Rating5 KVA to 100 KVA Air Cooled / 80 KVA to 500 KVA Oil Cooled
Type of connection3Ph 4Wire @ I/P, Star / Delta @ O/P
Input Voltage Range360-460 VAC L-L/
340-480 VAC L-L/ 
320-480 VAC L-L (Customized Range Available)
Output Voltage415 VAC L-L, ± 1 % (Customized Range Available)
Types Of ServoBalance Load / Unbalance Load
Response Time10 m Sec
Rate of CorrectionUp to 35 Volts/Sec
Efficiency> 98 %
ProtectionShort Circuit / Overload Protection by MCB/MCCB @ I/P Over Voltage, Under Voltage, Over Current Trip Protection by Digitally Controlled Power contactor @ O/P
Trip/Fault StatusVisual Fault Frame on LCD
Single Phase PreventionProvided by Digital Controller
CoolingAir Cooled / Oil Cooled
Load Regulation±1% Regulation From No Load To Full Load
Ambient Temperature20 ºC to 55 ºC
TypeAC Servo Based Dimmer Control by Controller Suitable for Unbalanced Load System Enclosure IP 23 – IP 55
Capacity1KVA to 20 KVA (Single phase) 
3 KVA to 500 KVA (Three phase) 
(Air cooled/oil cooled)
Input VoltageSingle Phase : 160-280 VAC /140-300 VAC
Three phase: 340-470 VAC / 300-480 VAC 
(4 wire system)
Output Voltage230 VAC for Single Phase (Adjustable : 10 V)
415 VAC for Three Phase (Adjustable & unbalance type)
Regulation± 1% or 0.5%
Supply Frequency47-53Hz
EfficiencyBetter than 98%
Wave Form DistortionNil
Effect of Load Power FactorNil
Rate of CorrectionSingle Phase : 35 V/sec
Three Phase : 70 V/sec
Type of ControlHigh Torque AC servo motor
Ambient Temp.0 to 45 (Max.)
EnvironmentDesigned for indoor tropical use.(out door unit also available
Accessories@ IndicationsOutput on/input on(R-Y-B)
@AC V-meterI/P :R-Y-B-RN-YN-BN
@ ControlsAuto/manual selector switch
I/P / O/P selector switch
INC/DCR selector switch
O/P Volt Adjustment Potentiometer


  •  O/P over/under volt trip
  •  Over load & short circuit through MCB at I/P
  •  Single phase preventer (SPP)
  •  Phase sequence changer trip (optional)
  •  EMI/RFI Filteration (optional)