Inconsistent power supply leads to voltage fluctuations, both upwards and downwards,which is a common site in most Indian industries. These voltage fluctuations may further negatively impact the factory machinery and reduces its normal life span. When power voltage reduces, the electric current in factory machines spike up that may cause an electric short circuit or burning of the machine.

To eliminate such voltage fluctuations electric stabilizers such as Singh IsoTech Power Stabilizers, the leading manufacturer of stabilizers in India, will not only control, but alleviate the voltage flow before it reaches the machine. A voltage stabilizer automatically maintains a constant voltage level and protects equipment from any damage.

There are various types of Stabilizers but Servo Stabilizers and Static Voltage Stabilizers are the two variants that Indian factory owners primarily install in their units.

Listed below are the key differences that help you decide which one is the best for your factory:


DifferenceServo StabilizerStatic Voltage Stabilizer (SVS)
FunctionalityComprises a servo motor controlled stabilization mechanism that ensures optimum voltage supply to the equipment. The supply is achieved by transformer boosters that capture voltage fluctuations from the input source and regulates current to appropriate output level.SVS is a Switched Mode Power Supply (SMPS) type of stabilizer for mains voltage, that is Alternate Current (AC) input and output. SVS has a switching topology where the Pulse Width Modulation (PWM) happens directly in the AC to AC switching, without causing any sort of harmonic distortions.
ReliabilityAchieves voltage correction in the electric load by increasing or decreasing the winding count in the auto transformer through the servo motor’s shaft. Therefore, consistency of the servo voltage regulators depends mainly on the reliability of the servo motor.Reliability of the SVS depends on the reliability of the insulated gate bipolar transistor (IGBT) power stage, as the static IGBT power stage has proved to be more reliable than the electromechanical servo motor. Therefore, SVS is considered more reliable than servo stabilizer.
PerformanceIt is an electromechanical device that uses a moving servo motor to achieve voltage corrections. Thus, it has a slower voltage correction speed (100 V/ sec) than SVS, while its servo stabilizer correction time ranges between 50 milliseconds and 5 seconds. It has a pure electric circuit (no moving part) to attain voltage the corrections and thus having an extremely low correction time of 20 to 30 milliseconds and an exceptionally high voltage correction speed ranging from 360 to 500 V/ sec.
ProtectionDigital Signal Processor (DSP) control board in the SVS consistently senses the input and output voltages, the IGBT current, and the load current, that quickly clears the over current faults without any additional hardware.Here, the over current protection can be achieved only by installing extra hardware, like Molded Case Circuit Breakers (MCCB), Miniature Circuit Breaker (MCB), or others. The fault clearing process is, however, not instant.
MaintenanceUses motor that results in wear and tear and thus needs frequent maintenance.SVS has a static mechanism that does not require regular maintenance.
Auto BypassComplicates the auto bypass working that makes the whole process quite costly. The mechanism will be with break in the output voltage and will need a transition time.Enables easy auto bypass because of the fast electronic system that automatically transfer to bypass without any break in the output voltage (Zero Transition Time), even in case of a fault.


This comparative overview suggests SVS to be more proficient than Servo Stabilizer.

Reach out to Singh IsoTech, the best electrical contractors in Delhi-NCR region and a proud member of Business Network International (BNI), to get the right stabilizer for your factory.

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