SG Power Products Pvt. Ltd. | Last updated: 27 October 2026
SG Power Products Pvt. Ltd. is a Noida-based servo voltage stabilizer manufacturer with 15+ years of manufacturing experience. We design, build and test servo stabilizers from 10 kVA to 500 kVA, in single-phase and three-phase, air-cooled and oil-cooled designs. More than 5,937 customers across 319+ cities in India use them.
On this page you'll find the full servo stabilizer price list and what affects servo stabilizer cost. You'll also learn how to choose the right voltage servo stabilizer for your home, office or factory. Prices start from about ₹32,000* + GST.

| Capacity | 10 kVA to 500 kVA |
| Phase | Single phase (10, 15 kVA) and three phase (10–500 kVA) |
| Cooling | Air cooled (10–50 kVA), oil cooled (60–500 kVA) |
| Input range | 170–280V or 140–280V per phase; custom on request |
| Control | Microcontroller-based, true RMS sensing, digital display |
| Protections | Over/under voltage cut-off, overload, phase reversal, single phasing, time delay |
| Price | From about ₹32,000* + GST (10 kVA) |
| Testing | 100% units tested, 173 checkpoints, NABL lab-tested design |
| Supply | Manufactured in Noida, supplied across India |
* Prices are indicative. For the latest price, contact SG Power.
Looking to buy a servo voltage stabilizer? Get it straight from SG Power, with no middleman margin.
Prices from about ₹32,000* + GST (10 kVA single phase), with a full price list below
10 kVA to 500 kVA, single phase and three phase, air cooled and oil cooled
Expert help choosing the right capacity for your load and site voltage
Built and tested in our own facility, with 173 quality checkpoints per unit
Supply and service across India from our base in Noida
A servo stabilizer is a voltage regulating device that uses a servo motor to correct voltage fluctuations. It keeps the output voltage stable when the incoming supply rises, drops or becomes unbalanced. A voltage servo stabilizer protects motors, compressors, CNC machines, medical equipment and electronics from damage caused by unstable power.
It is also called a servo controlled voltage stabilizer, an automatic voltage regulator (AVR) or a servo voltage stabiliser. All these names describe the same job: stabilising the supply voltage and improving power quality for everything connected to it.
Steady output voltage, whatever the supply does
Smooth, stepless correction with no sudden jumps
Protection for motors, compressors and electronics
Fewer breakdowns, repairs and production stoppages
Longer equipment life
One unit can protect a whole home, office or factory
Lights dim or flicker when heavy equipment starts
ACs, compressors or machines trip on low or high voltage
Motors run hot or burn out more often than they should
Electronics, controllers or display boards fail frequently
Your area gets very low voltage in summer or at peak hours
You run sensitive or costly equipment such as CNC machines or medical devices
A servo voltage stabilizer works by sensing the input voltage and using a servo motor to move a dimmer, which sets how much voltage a buck-boost transformer adds or subtracts. This keeps the output steady at the set level, smoothly and continuously, whatever the supply voltage does.
Every SG Power servo stabilizer is built around a microcontroller-based, true RMS control system:
True RMS sensing: the controller samples the input voltage at a very high rate and measures its true RMS value, without a separate control transformer.
AC stepper motor: when the voltage changes, the controller drives a high-torque, high-efficiency AC stepper motor.
Dimmer (variable auto transformer, or variac): the motor moves the dimmer to the required position.
Buck-boost transformer: adds or subtracts voltage so the output returns to the set level.
The dimmer and buck-boost transformers are designed to carry 100% load current continuously. For parts and a diagram, read how a servo stabilizer works.
| Type | Capacity | Input Voltage Range | Cooling |
|---|---|---|---|
| Single phase | 10 kVA, 15 kVA | 170–280V per phase | Air cooled |
| Three phase | 10 kVA – 50 kVA | 170–280V or 140–280V per phase | Air cooled |
| Three phase | 60 kVA – 500 kVA | 170–280V or 140–280V per phase | Oil cooled |
Three-phase models are available at 10, 15, 20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 200, 250, 400 and 500 kVA. The 140–280V wide-range option is available from 30 kVA to 60 kVA for low-voltage areas. Output voltage is set to the standard 230V for single phase or 415V for three phase, and can be adjusted on the front panel. We also build stabilizers to customer specifications. See our air cooled servo stabilizers , oil cooled servo stabilizers and 3 phase stabilizers.
Every SG Power unit is a digital servo stabilizer, with a digital display of:
Phase-to-neutral voltage
Phase-to-phase voltage
Frequency
Output load current of each phase
Adjustable output set voltage and input voltage band
Input over-voltage and under-voltage cut-off
Overload cut-off
Phase reversal protection cut-off
Single phasing protection
Trip time delay adjustment with variable settings
Manual or automatic output start and stop
Calibration through a front-panel touch-pad (no potentiometer adjustments)
| Protection | What It Protects Against |
|---|---|
| Over-voltage cut-off | High supply voltage damaging equipment |
| Under-voltage cut-off | Very low voltage that overheats motors |
| Overload cut-off | Connected load exceeding the stabilizer’s capacity |
| Phase reversal protection | Wrong phase sequence that can run motors backwards |
| Single phasing protection | Loss of one phase, which can burn three-phase motors |
| Trip time delay | Restart surges and compressor damage after a power cut |
Transformers made in-house using high-quality grain-oriented (CRGO) silicon steel for low iron losses, constructed as per the Indian standard for servo motor operated line voltage correctors, IS 9815 (Part 1)
AC stepper motor with high efficiency and high torque
100% continuous load rating for the dimmer and buck-boost transformers
NABL lab tested for electrical performance and safety
100% units tested, with a 3-level quality check covering 173 checkpoints
The servo stabilizer cost in India starts from around ₹32,000* for a 10 kVA single-phase model and goes up to several lakhs for a 500 kVA oil-cooled three-phase model. The price lists below cover every SG Power single-phase and three-phase model.
| Model | Cooling | Approximate Price (+ GST) |
|---|---|---|
| 10 kVA | Air cooled | ₹32,000* and above |
| 15 kVA | Air cooled | Price on request |
Prices exclude GST, freight and installation. * Prices are indicative. For the latest price, contact SG Power.
The 3 phase servo stabilizer price depends on capacity, cooling and input range. Larger industrial servo stabilizers are oil cooled, so the oil cooled servo stabilizer price applies from 25 kVA upward.
| Model | Cooling | Input Range (per phase) | Approximate Price (+ GST) |
|---|---|---|---|
| 10 kVA | Air cooled | 170–280V | ₹32,000* and above |
| 15 kVA | Air cooled | 170–280V | Price on request |
| 20 kVA | Air cooled | 170–280V | Price on request |
| 25 kVA | Air cooled | 170–280V | Price on request |
| 30 kVA | Air cooled | 170–280V / 140–280V | Price on request |
| 40 kVA | Air cooled | 170–280V / 140–280V | Price on request |
| 50 kVA | Air cooled | 170–280V / 140–280V | Price on request |
| 60 kVA | Oil cooled | 170–280V / 140–280V | Price on request |
| 75 kVA | Oil cooled | 170–280V | Price on request |
| 100 kVA | Oil cooled | 170–280V | Price on request |
| 125 kVA | Oil cooled | 170–280V | Price on request |
| 150 kVA | Oil cooled | 170–280V | Price on request |
| 200 kVA | Oil cooled | 170–280V | Price on request |
| 250 kVA | Oil cooled | 170–280V | Price on request |
| 400 kVA | Oil cooled | 170–280V | Price on request |
| 500 kVA | Oil cooled | 170–280V | Price on request |
Prices exclude GST, freight and installation, and depend on your exact servo voltage stabilizer model.
* Prices are indicative. For the latest price, contact SG Power.
See the full range in the price list above, compare air cooled, oil cooled and 3 phase stabilizer models, or learn more about SG Power.
Request a QuoteMany buyers know their load in kW, not kVA. Use this table to find the right size and its approximate cost.
| Your Load | Recommended Capacity | Approximate Cost |
|---|---|---|
| 10 kW | 10 kVA | ₹32,000* and above |
| 15 kW | 20 kVA | Price on request |
| 20 kW | 25–30 kVA | Price on request |
| 40 kW | 50–60 kVA | Price on request |
| 80 kW | 100–125 kVA | Price on request |
| 160 kW | 200–250 kVA | Price on request |
Sizing assumes a 0.8 power factor plus about 25% margin. Motors, compressors and lifts may need a larger size.
* Prices are indicative. For the latest price, contact SG Power.
Know your load? Send us your kW or appliance list and get an exact servo stabilizer price for your site.
The servo stabilizer cost depends mainly on capacity (kVA), single- or three-phase supply, input voltage range and cooling type. Customisation, GST, freight and installation also add to the final price. The main factors are:
Capacity (kVA): higher capacity needs more copper and a larger transformer
Single phase or three phase: three-phase models cost more
Input voltage range: the wide 140–280V range costs more than 170–280V
Cooling type: oil-cooled models cost more than air-cooled ones
Winding material: copper-wound stabilizers cost more than aluminium-wound ones, but run cooler and last longer
Customization: special voltage settings, enclosures or isolation transformers
GST, freight and installation: usually charged extra on the quoted price
After-sales support: a manufacturer with local service saves money over the stabilizer’s life
Very low prices usually mean lighter transformers, less copper, a narrow input range or fewer protections. These units can overheat, wear out faster or fail to protect your equipment. Compare stabilizers on transformer quality, input range, protections, testing and service support, not price alone. Every SG Power unit is tested through 173 checkpoints before dispatch.
| Feature | Very Cheap Servo Stabilizer | Quality Servo Stabilizer (SG Power) |
|---|---|---|
| Transformer | Lighter, lower-grade core | In-house CRGO core, built to IS 9815 (Part 1) |
| Load rating | May not handle full load continuously | Rated for 100% load continuously |
| Input range | Often narrow | 170–280V or 140–280V; custom on request |
| Protections | Basic | Over/under voltage, overload, phase reversal, single phasing, time delay |
| Testing | Often limited | 100% units tested, 173 checkpoints, NABL lab-tested design |
| Service | Often unavailable | Service support in 319+ cities |
| Real cost over time | Higher (repairs, downtime, replacement) | Lower |
An air cooled servo stabilizer is a compact, low-maintenance unit for clean indoor rooms; SG Power offers it from 10 to 50 kVA. An oil cooled servo stabilizer handles heavy continuous loads and dusty or hot sites better, and is offered from 60 to 500 kVA. Choose by load, environment and running hours.
| Factor | Air Cooled | Oil Cooled |
|---|---|---|
| SG Power range | 10 kVA – 50 kVA | 60 kVA – 500 kVA |
| Best for | Clean, ventilated indoor rooms | Heavy loads, dusty or hot sites |
| Size | Compact | Larger |
| Maintenance | Very low | Periodic oil checks |
| Price | Lower | Higher |
A servo voltage stabilizer is used wherever equipment must run on steady voltage, even when the supply fluctuates. Typical uses include:
Servo stabilizer for CNC machines and industry: CNC and VMC machines, moulding machines, compressors and motors stop tripping, overheating or breaking down due to low or high voltage.
Servo stabilizer for hospitals: imaging, diagnostic and ICU equipment in hospitals and clinics needs stable voltage for accurate, safe operation.
Keeping production running: factories avoid downtime, rejected products and repair costs caused by voltage swings.
Whole-building protection: one mainline stabilizer protects every load in a home, office, mall or institution.
Servo stabilizer for lifts and HVAC: lifts, chillers and air conditioning run smoothly without voltage-related faults.
Cold storage and process plants: compressors and controls run continuously without voltage damage.
SG Power provides custom engineering for: cold storage, water bottling plants, CNC machines, SCADA-based systems, hospitals, malls and institutions, lifts, and factories, offices and commercial buildings.
The input voltage range is the span of supply voltage the stabilizer can correct. Choose a range that covers the lowest and highest voltage at your site.
| Input Range (per phase) | Best For |
|---|---|
| 170–280V | Most cities and industrial areas with normal fluctuations (SG Power standard) |
| 140–280V | Areas where voltage often drops below 170V (SG Power wide-range option, 30–60 kVA) |
| Wider ranges, such as 90–300V | Very low-voltage areas, such as rural sites or the end of long supply lines |
A servo stabilizer for low voltage areas needs a wider range and a larger transformer, so it costs more. Record your site voltage over a few days before choosing. If your voltage drops very low, contact SG Power to discuss a custom range for your site.
A normal relay-type automatic voltage stabilizer switches between fixed transformer taps using relays, so it corrects voltage in steps and you often hear it click. A servo stabilizer moves a motor-driven dimmer continuously, so correction is smooth and stepless. That makes a servo stabilizer better for sensitive, costly and industrial equipment, and for whole-building protection.
| Feature | Servo Stabilizer | Relay Stabilizer |
|---|---|---|
| How it corrects | Motor-driven dimmer, smooth and stepless | Relays switch fixed taps, in steps |
| Capacity range | Up to 500 kVA (SG Power) | Mostly small capacities |
| Best for | Sensitive and industrial equipment, whole buildings | Single basic appliances |
| Life span | Longer | Moderate |
| Price | Higher | Lower |
A home servo stabilizer is usually installed as a mainline stabilizer for the whole house, right after the electricity meter, so one unit protects every appliance in the house: ACs, refrigerator, TV, washing machine, geyser, water pump and lights. This is more reliable and often cheaper than buying a separate stabilizer for each appliance.
SG Power's single-phase 10 kVA and 15 kVA servo stabilizers are built for homes, flats, villas and small offices. Homes with a three-phase connection can use our three-phase models from 10 kVA.
Check each appliance's rating plate for exact values.
| Appliance | Typical Running Load |
|---|---|
| 1.5 ton split AC | 1,500 – 2,000 W |
| Refrigerator | 150 – 300 W |
| Washing machine | 500 – 2,000 W |
| Geyser | 2,000 – 3,000 W |
| Water pump (1 HP) | about 750 W |
| Microwave oven | 1,000 – 1,500 W |
| LED TV | 50 – 200 W |
| Lights and fans (whole home) | 300 – 800 W |
Add up what runs at the same time and use the sizing table below to pick 5, 10 or 15 kVA.
Most homes need a 5–15 kVA servo stabilizer, while factories and commercial buildings usually need 25 kVA or more. To find the exact size, add up the wattage of everything that runs at the same time, convert it to kVA, and add a margin for motor starting current.
Formula: Required kVA = (total load in kW ÷ 0.8) × 1.25
| Typical Load | Suggested Servo Stabilizer |
|---|---|
| Flat or home with 1–3 ACs, refrigerator, washing machine, geyser | 10 kVA single phase |
| Large home or villa with 3–4 ACs, pump and heavy appliances | 15 kVA single phase |
| Small office, clinic or workshop on three-phase supply | 10–25 kVA three phase |
| CNC machine, small factory or cold storage room | 25–50 kVA three phase |
| Factory, hospital, mall or commercial building | 75–500 kVA three phase, oil cooled |
This table is a starting guide. Share your load list and SG Power will recommend the exact capacity.
Need help sizing your stabilizer? SG Power's engineers will calculate the right capacity for your home, office or factory.
Get Expert AdviceChoose a single phase servo stabilizer if your building has a single-phase connection, typical of homes, flats and shops. Choose a three phase servo stabilizer for a three-phase connection, typical of factories, hospitals, commercial buildings and large homes. The stabilizer must always match your electricity supply.
| Feature | Single Phase | Three Phase |
|---|---|---|
| SG Power capacities | 10, 15 kVA | 10 to 500 kVA |
| Supply type | 2-wire, single-phase connection | 4-wire, three-phase connection |
| Typical users | Homes, flats, shops, small offices | Industries, commercial buildings, hospitals, large homes |
| Cooling | Air cooled | Air cooled (10–50 kVA) or oil cooled (60–500 kVA) |
| Phase protection | Not applicable | Each phase displayed and protected, with phase reversal and single phasing protection |
Always match the stabilizer to your electricity connection.
To choose the right servo stabilizer, match its capacity to your load, its phase to your supply and its input range to your site voltage, then check the cooling type, protections, display and after-sales service. Follow these nine steps:
Calculate your total load. Add the kW of all connected equipment, convert to kVA (kW ÷ 0.8) and add a 20–30% margin.
Check your supply. Choose single phase for small homes and offices, and three phase for industries and large buildings.
Record your site voltage. Choose an input range that covers your lowest voltage. If it often drops below 170V per phase, choose the 140–280V wide-range model.
Choose the cooling type. Air cooled up to 50 kVA for clean rooms; oil cooled for heavy loads and harsh sites.
Check the protections. High/low voltage cut-off, overload cut-off, time delay, and phase reversal and single phasing protection on three-phase models.
Check the display. A digital display should show actual voltage, frequency and load current; SG Power models display all of these.
Plan the installation. Small single-phase units may be wall mounted; larger units are floor standing on wheels or a base.
Ask about isolation transformers for sensitive medical or electronic loads. SG Power manufactures isolation transformers from 10 kVA to 2000 kVA.
Buy from a manufacturer that tests every unit and has service support near you.
| Term | What It Means |
|---|---|
| kVA and kW | kVA is the stabilizer’s capacity; kW is the real power your equipment uses. kVA = kW ÷ power factor (about 0.8 for most loads). |
| Power factor | The ratio of real power (kW) to apparent power (kVA). Motors and compressors usually have a lower power factor, so they need more kVA. |
| Input voltage range | The span of supply voltage the stabilizer can correct, e.g. 170–280V per phase. |
| Output voltage | The steady voltage the stabilizer delivers, usually 230V single phase or 415V three phase. |
| Output accuracy | How closely the output is held to the set voltage. Ask for this figure when comparing models. |
| Correction speed | How fast the stabilizer corrects a change, in volts per second. Faster correction suits loads that switch often. |
| Buck-boost transformer | The transformer that adds (boosts) or subtracts (bucks) voltage to correct the output. |
| Dimmer or variac | The variable auto transformer the servo motor adjusts to set the correction. |
| Carbon brush | The contact that moves along the dimmer winding; it wears slowly and is replaced during servicing. |
| True RMS sensing | Measures the actual effective voltage accurately, even when the waveform is distorted. |
| CRGO core | Cold rolled grain oriented steel used in transformer cores to reduce iron losses and heating. |
| Single phasing | Loss of one phase in a three-phase supply, which can burn motors; the stabilizer cuts off to protect them. |
| Phase reversal | A wrong phase sequence that can run motors in reverse; the stabilizer detects and blocks it. |
| Time delay | A short wait before the output switches on after a power cut, protecting compressors from restart surges. |
| Bypass switch | Connects the load directly to mains during servicing; equipment is unprotected in bypass mode. |
| Relay (automatic) voltage stabilizer | Corrects voltage in steps using relays; cheaper but less precise than a servo stabilizer. |
| Static voltage stabilizer | Corrects voltage electronically with no moving parts; used for some highly sensitive loads. |
| Isolation transformer | Separates the load electrically from the supply, reducing noise for sensitive medical and electronic equipment. |
Not sure which model you need? Share your load and site voltage, and SG Power's engineers will recommend the right servo stabilizer.
Get a QuoteTo operate a servo voltage stabilizer, switch on the input, wait for the time delay, check the display and then switch on the load. To maintain it, keep it clean and ventilated, check the carbon brushes and connections, check the oil on oil-cooled models and book an annual service.
Have the stabilizer installed by a qualified electrician, with correct cable sizes and earthing. See our servo stabilizer installation guide.
Switch on the input supply to the stabilizer.
Wait for the time delay to finish while the stabilizer checks the voltage.
Check the input and output voltage on the digital display.
Switch on the connected load.
Use the bypass switch only for servicing or emergencies, as equipment is unprotected in bypass mode.
Keep the unit clean and well ventilated; don’t block the vents.
Have a trained technician inspect and replace worn carbon brushes.
Keep terminals tight to avoid heating and voltage drop.
Check oil level and condition on oil-cooled models during service visits.
Call for service if the output voltage drifts or the unit trips often.
Book an annual service or AMC to catch problems early.
Fit a surge protection device ahead of the stabilizer; a servo stabilizer corrects slow voltage changes, not lightning spikes.
SG Power combines 15+ years of manufacturing, in-house transformers and 100% unit testing with service support in 319+ cities. That makes it a reliable choice for voltage servo stabilizers from 10 kVA to 500 kVA.
15+ years of manufacturing
7,000 sq m factory with 84 machines and 250+ employees
5,937+ customers and 89% customer retention
Service network across 319+ cities
ISO 9001:2015 certified, CE and RoHS certified, MSME registered
NABL lab-tested servo stabilizers
100% units tested through 173 quality checkpoints
Custom-built stabilizers for your site conditions
Range: 10 kVA to 500 kVA (air cooled from 10 kVA to 50 kVA, oil cooled from 60 kVA to 500 kVA)
Every SG Power servo stabilizer passes a 3-level quality check covering 173 checkpoints before dispatch. Our servo voltage stabilizers have also been tested at an NABL-accredited laboratory (Hydel Laboratories) for electrical performance and safety.
| Certification / Test | What It Means for You |
|---|---|
| NABL lab test (Hydel Laboratories) | Servo stabilizer performance and safety checked by an accredited lab |
| ISO 9001:2015 | Certified quality management system |
| CE certified | Meets safety and performance compliance |
| RoHS compliant | Restricted hazardous substances |
| MSME registered | Registered Indian manufacturer |
| 173-point quality check | Every unit tested before dispatch |
SG Power servo stabilizers are designed and built at our own factory: a 7,000 sq m facility with 84 machines, 17+ heavy machines and 250+ employees. Transformers are wound and tested in-house, which lets us control quality and build custom designs quickly.
| Facility Fact | Detail |
|---|---|
| Factory area | 7,000 sq m |
| Machines | 84, including 17+ heavy machines |
| Team | 250+ employees |
| Experience | 15+ years of manufacturing |
| Quality control | 3-level check, 173 checkpoints, 100% units tested |
Learn more about SG Power.
SG Power supplies power and electrical safety products to government bodies, PSUs and leading private companies across India, including:
Power and utilities: POWERGRID, NTPC, BHEL, Adani, Reliance Power, NPCL, AVVNL, JVVNL, NPCIL, Coal India
Infrastructure and metro: L&T, Alstom, Tata Projects (Smart City), Indian Railways, Shapoorji Pallonji, Welspun, JMC Projects
Defence and government: Indian Army, Indian Air Force, DRDO, BSF, Bharat Dynamics, Ministry of Defence, Airports Authority of India, CSIR
Industry and corporate: Siemens, JSW, Hindalco, JK Cement, Apollo Tyres, KEI, RR Kabel, ICICI Bank, Bhushan Power, Jubilant, Prateek Group
Telecom and aviation: BSNL, CEL, SpiceJet
With 1,319 dealer cities and service support in 319+ cities, SG Power can deliver, install and service stabilizers across India, including:
| Region | Cities |
|---|---|
| North | Noida, Delhi NCR, Gurugram, Kanpur, Mathura, Prayagraj, Roorkee, Rohtak |
| South | Hyderabad, Kukatpally, Bengaluru, Chennai, Coimbatore, Tirupati |
| West | Ahmedabad, Pune, Rajkot, Bhuj, Akola, Aurangabad, Vasai |
| Central | Bhopal, Satna |
| East and North-East | Ranchi, Purnia, Cuttack, Berhampore, Barpeta, Goalpara |
…and many more.
SG Power is a servo voltage stabilizer manufacturer and supplier in Noida, with our office in Sector 62 and our own manufacturing facility. Customers in Noida, Greater Noida, Ghaziabad, Delhi, Gurugram and Faridabad get quick site visits, delivery and service support, and we supply across India from here.
Share these details for a fast, accurate quote:
Required capacity (kVA) or total connected load (kW)
Single phase or three phase
Lowest and highest voltage at your site
Air cooled or oil cooled preference
Application (home, factory, hospital, lift, CNC, cold storage, etc.)
Delivery location