SG Power Products Pvt. Ltd. is one of the Noida-based 25 kva servo stabilizer manufacturers, building three-phase air-cooled and oil-cooled models in its own Ghaziabad factory. A 25 kva servo stabilizer holds the voltage steady for a running load of up to about 16 kW. It suits CNC machines, workshops, offices, clinics, hotels and large homes with lifts.
As direct 25 kva servo stabilizer suppliers, we sell to end users, contractors and project buyers across India with no trader's margin. This page covers the 25 kva servo stabilizer price, how much load it runs, air vs oil cooling, specifications and how to choose a manufacturer.
| Capacity | 25 kVA (25,000 VA, about 20 kW at a 0.8 power factor) |
| Recommended running load | Up to about 16 kW, allowing a 25% safety margin |
| Phase | Three phase, four wire (415V supply) |
| Cooling | Air cooled or oil cooled |
| Input range | 170–280V per phase (340–480V phase to phase); custom on request |
| Output voltage | 410V ±1% (P-P) and 230V ±1% (P-N); set point adjustable to 380, 400 or 415V |
| Full-load current | About 35 A per phase |
| Regulation and efficiency | ±1% regulation, 97% efficiency tested to IS 2026 (Part 1) |
| Output delay | Adjustable from 3 to 200 seconds |
| Control | KNEUTRON microcontroller-based, true RMS sensing, digital display |
| Approximate price | From about ₹60,000 + GST |
| Testing | 100% units tested, 173 checkpoints, NABL lab-tested design |
Prices are indicative. For the latest price, contact SG Power.
Need a dependable 25 kVA unit for a factory, office or building? Buy straight from SG Power, the company that designs, winds and tests it. You get factory pricing, a free load and site-voltage check, and an air or oil-cooled model matched to your site.
| From SG Power (Manufacturer) | From a Trader or Reseller |
|---|---|
| Factory pricing, no middleman margin | Reseller margin added |
| Sizing by the team that builds the unit | Advice varies by seller |
| Air or oil cooling and input range matched to your site | Mostly stock models only |
| Transformers wound and tested in-house | Source of parts often unknown |
| Every unit tested through 173 checkpoints | Testing depends on the source |
| Service support in 319+ cities | Depends on the reseller |
A 25 kVA servo stabilizer is a three-phase voltage stabilizer rated for 25,000 VA, or about 20 kW at a 0.8 power factor. A motor-driven variac and buck-boost transformer on each phase hold the output at 410V ±1% phase to phase, and 230V ±1% phase to neutral, when the mains rises or falls. It protects machines, ACs and electronics across a whole building.
It is also called a 25 kva servo voltage stabilizer, a 25 kva 3 phase servo stabilizer or an automatic voltage regulator (AVR). Some buyers search for a 25 kVA servo controlled voltage stabilizer, also spelt stabiliser. The variac is often called a dimmer, and it handles everyday voltage fluctuations without steps. SG Power's 25 kVA models are part of its KNEUTRON microcontroller-based true RMS range, within the full servo voltage stabilizer lineup from 10 to 500 kVA.
The 25 kVA servo stabilizer price in India typically starts from about ₹60,000 + GST for a three-phase model. Air-cooled models sit at the lower end and oil-cooled models at the upper end. Wider input ranges for low-voltage areas, unbalanced designs and extra protections add to the price.
| 25 kVA Model | Input Range (per phase) | Best For | Approximate Price (+ GST) |
|---|---|---|---|
| Three phase, air cooled | 170–280V | Clean, ventilated electrical rooms; offices, clinics, homes | starts from ₹60,000 |
| Three phase, oil cooled | 170–280V | Dusty or hot sites, factories, round-the-clock use | starts from ₹75,000 |
| Three phase, wide range (custom) | e.g. 140–280V | Industrial areas with very low voltage | Price on request |
| Single phase, 25 kVA (on request) | e.g. 170–270V | Large sites with a heavy single-phase connection | Price on request |
Prices exclude GST, freight and installation. Prices are indicative. For the latest price, contact SG Power.
Online, 25 kVA servo stabilizer prices vary from about ₹19,000 to over ₹1,00,000, because sellers list different products under the same rating. Three-phase and single-phase units, air and oil cooling, narrow and wide input ranges, and prices with or without GST all appear side by side.
| Price Band (Online Listings) | What You Usually Get |
|---|---|
| Under ₹35,000 | Basic or relay-type units, narrow input ranges, or prices shown before GST and freight |
| ₹35,000 – ₹50,000 | Standard three-phase air-cooled servo models |
| ₹50,000 – ₹80,000 | Oil-cooled, wide-range or unbalanced three-phase servo models |
| Over ₹80,000 | Single-phase 25 kVA units, heavy-duty builds, special input ranges, and marketplace prices that include GST and delivery |
These bands describe what other sellers list online, not SG Power's own prices. Prices are indicative. For the latest price, contact SG Power.
Compare the cooling, input range, design and total delivered cost, not just the headline 25 kVA 3 phase servo stabilizer price.
A 25 kVA single phase servo stabilizer exists, but it is rare, because it carries about 104 A at 240V. That needs a large single-phase connection, heavy cables and big switchgear. Single-phase listings online often cost ₹90,000 or more, so most sites with a 25 kVA load use a three-phase unit instead.
If your site has only a single-phase supply and a load near 16 kW, ask SG Power to check the load first. A three-phase connection with a 25 kVA three phase servo stabilizer, or two smaller single-phase units on separate circuits, is often the cheaper option — see the 15 kVA and 10 kVA single-phase models.
The 25 kVA servo stabilizer price depends mainly on cooling, input voltage range and design. Oil cooling, wider ranges and unbalanced correction cost more. Transformer core and winding quality, protections, testing, GST, freight and installation explain the rest of the gap between two quotes, so always compare like for like.
Air or oil cooling: oil-cooled units need a tank and transformer oil, so they cost more
Input voltage range: wider ranges need larger transformers. On published price lists, a very wide-range 25 kVA unit can cost about half as much again
Winding and core: good windings and CRGO cores run cooler and last longer
A 25 kVA servo stabilizer can carry about 20 kW at full rating. For safe everyday use, keep the running load to about 16 kW, which leaves a 25% margin for the surge when motors, compressors and ACs start. Spread the load evenly across the three phases.
Add up the rated power (kW) of every machine and appliance that runs at the same time.
Divide by the power factor, usually 0.8, to convert kW to kVA.
Multiply by 1.25 to add a 25% margin for motor starting current.
Choose the next standard rating: up to 25 kVA means a 25 kVA unit; above it, choose 30 kVA or more.
Sizing formula: Required kVA = (running load in kW ÷ 0.8) × 1.25. Most electricians add a 20–30% margin for starting surges; this page uses 25%.
For a whole building: check the sanctioned (contract) load on your electricity bill. A mainline stabilizer is often sized at about 1.2–1.3 times the sanctioned load in kVA, then checked against the running load.
| Example Load | Running Load | Is 25 kVA Right? |
|---|---|---|
| One mid-size CNC lathe or VMC with a compressor | about 14–15 kW | Yes |
| Workshop: several small machines, lighting and fans | about 13 kW | Yes |
| Office floor: 40 computers, 4 ACs, printers, lighting | about 14 kW | Yes |
| Clinic or diagnostic centre: lab equipment, ACs, lighting | about 12 kW | Yes |
| Large three-phase home: 5 ACs, lift and pumps | about 15 kW | Yes |
| Running load of 17–19 kW | 17–19 kW | No, choose 30 kVA |
| Running load of 20 kW or more | 20 kW and above | No, choose 40 kVA or more |
Check each machine's nameplate rating; compressors and lifts may need extra margin.
Not sure about your load? Send us your machine list and we will confirm whether 25 kVA is the right capacity for your site.
Get Free Sizing AdviceChoose 20 kVA for a running load up to about 12.8 kW and 25 kVA for up to about 16 kW. Choose 30 kVA for up to about 19.2 kW. A 15 kW load needs about 23.4 kVA, so 25 kVA is the right size; buying the right size the first time avoids overload trips.
| 20 kVA | 25 kVA | 30 kVA | |
|---|---|---|---|
| Full rating (0.8 power factor) | about 16 kW | about 20 kW | about 24 kW |
| Safe running load (25% margin) | about 12.8 kW | about 16 kW | about 19.2 kW |
| Current per phase at 415V | about 28 A | about 35 A | about 42 A |
| SG Power cooling options | Air cooled | Air or oil cooled | Air or oil cooled |
| Approximate price (+ GST) | starts from ₹50,000 | starts from ₹60,000 | starts from ₹75,000 |
| Typical users | Large homes, small offices | CNC machines, workshops, offices, clinics | Small factories, hotels, buildings |
Prices are indicative. For the latest price, contact SG Power.
Compare the 15 kVA servo stabilizer, the 10 kVA servo stabilizer and the full servo stabilizer range.
Not sure whether 25 kVA is enough? Share your machine or appliance list, and we'll recommend the right size.
At 25 kVA, SG Power offers both an air-cooled and an oil-cooled servo stabilizer. Choose a 25 kva air cooled servo stabilizer for a clean, ventilated electrical room. Choose a 25 kva oil cooled servo stabilizer for dusty workshops, hot rooms, outdoor sheds or round-the-clock operation.
| 25 kVA Air Cooled | 25 kVA Oil Cooled | |
|---|---|---|
| Cooling | Natural or fan air flow | Transformer immersed in oil |
| Best site | Clean, dry, ventilated indoor rooms; offices and commercial spaces | Dusty, humid or hot sites; heavy industrial loads |
| Duty | Continuous, in a cool room | Continuous, including 24×7 operation |
| Maintenance | Dust cleaning, brush checks | Also oil level and condition checks |
| Weight and size | Lighter, more compact | Heavier, needs a firm base |
A balanced 25 kVA servo stabilizer corrects all three phases together, which suits three-phase motors and machines that load each phase equally. An unbalanced model corrects each phase on its own, which suits buildings where each phase feeds different single-phase loads, such as ACs, lights and computers.
| Balanced | Unbalanced | |
|---|---|---|
| How it corrects | All phases together | Each phase separately |
| Best for | CNC machines, motors, pumps, compressors | Offices, homes, hotels, mixed loads |
| Typical site | Factory, workshop | Commercial building, villa |
| Price | Lower | Higher |
SG Power makes both the balanced and the unbalanced 25 kVA servo stabilizer. One cabinet with three per-phase sections usually costs less and takes less space than three separate single-phase units. If you're unsure, share your load list and supply readings, and we'll recommend one.
The 25 kVA servo stabilizer specifications below are for SG Power's three-phase, four-wire unit in air-cooled and oil-cooled versions. It accepts 170–280V per phase (340–480V phase to phase) and holds 410V ±1% phase to phase. Efficiency is 97%, tested as per IS 2026 (Part 1):1977, and the output delay is adjustable from 3 to 200 seconds.
| Parameter | 25 kVA Air Cooled | 25 kVA Oil Cooled |
|---|---|---|
| Capacity | 25 kVA, three phase | 25 kVA, three phase |
| Input voltage range | 170–280V per phase (340–480V phase to phase) | Same |
| Output voltage | 410V ±1% (P-P), 230V ±1% (P-N); settable to 380, 400 or 415V | Same |
| Regulation | ±1% | ±1% |
| Efficiency | 97%, tested as per IS 2026 (Part 1):1977 | 97%, tested as per IS 2026 (Part 1):1977 |
| Output frequency | 50 Hz ±3% | 50 Hz ±3% |
| Output delay | 3–200 seconds, adjustable | 3–200 seconds, adjustable |
| Control | KNEUTRON microcontroller, true RMS sensing | Same |
| Motor | High-torque AC stepper motor | Same |
| Winding | Pure copper winding | Pure copper winding |
| Housing and mounting | Powder coated CRC sheet, floor mounted | Powder coated CRC sheet, floor mounted |
| Transformer | In-house CRGO core, built to IS 9815 (Part 1), IS 5142 and IS 2026 | Same, oil immersed |
| Design | Balanced or unbalanced | Balanced or unbalanced |
| Duty | 100% load, continuous | 100% load, continuous |
These are the Guaranteed Technical Particulars from SG Power's own datasheets for this model. Other input ranges are built to customer specification, and the IS standards are published by the Bureau of Indian Standards.
Sellers state the range either per phase (such as 170–280V) or phase to phase (such as 300–470V or 270–480V). Convert both to the same basis before comparing; phase-to-phase voltage is about 1.73 times the per-phase voltage. Output is likewise quoted as 400V or 415V; SG Power's guaranteed figure is 410V ±1% phase to phase, and the set point can be adjusted to 380, 400 or 415V.
Key features of every SG Power 25 kVA servo stabilizer are a KNEUTRON digital controller, a front-panel display and ±1% voltage regulation. Its protections cut off the output on over-voltage, under-voltage, overload, phase reversal and single phasing, and add an adjustable trip time delay. Calibration is done on a touch-pad, with no potentiometer adjustment.
The display shows: phase-to-neutral and phase-to-phase voltages, frequency and the current of each phase.
| Protection | What It Guards Against |
|---|---|
| Over-voltage cut-off | High mains voltage reaching machines and electronics |
| Under-voltage cut-off | Very low voltage that overheats motors |
| Overload cut-off | Load above 25 kVA; the output switches off and restarts once the load is reduced |
| Trip time delay (3–200 seconds) | Compressor and motor damage when power returns after a cut |
| Phase reversal cut-off | Wrong phase sequence that can run motors backwards |
| Single phasing protection | Loss of one phase, which can burn out three-phase motors |
A 25 kVA servo stabilizer is used where a three-phase running load of about 12 to 16 kW needs steady voltage. Typical users are CNC machine shops, small factories, offices, clinics, hotels, restaurants and large homes with lifts. One mainline unit protects every machine and appliance on the supply.
25 kva servo stabilizer for CNC machine: CNC lathes, VMCs and other machine tools, where voltage swings cause errors and drive faults
25 kVA servo stabilizer for factory and workshop use: an industrial servo stabilizer for motors, compressors, light-duty welding, and printing, packaging and plastics lines
Offices and IT floors: computers, servers, ACs and lighting, usually with an unbalanced model
Hotels, restaurants, malls and institutions: kitchen equipment, ACs, lifts and lighting
Cold storage and water bottling plants: compressors, filling lines and pumps that run for long hours
SCADA-based and automated systems: controllers and drives that need good power quality and steady voltage to avoid faults
25 kva servo stabilizer for lift: passenger and goods lifts with motors of about 7.5–11 kW
25 kVA stabilizer for home: large homes and villas with five or more ACs, a lift and pumps on a three-phase supply
For hospitals, clinics, labs and diagnostic centres: medical and lab equipment and ACs; pair with an isolation transformer for sensitive medical loads
The main advantages of a 25 kVA servo stabilizer are a precise, steady output and no distortion to the voltage waveform, because it is a motor-controlled variable transformer. Its limitations are carbon brush wear, slower correction than a static stabilizer, and no electrical isolation, so sudden spikes still need a surge protection device.
| Advantages | Limitations |
|---|---|
| ±1% output on SG Power models, smooth and stepless | Carbon brush and variac track wear, so yearly service is needed |
| Handles full load continuously, including motors | Corrects more gradually than a static (solid-state) stabilizer |
| Adds no waveform distortion | No galvanic isolation; add a surge device, or an isolation transformer for sensitive loads |
| Rugged, repairable design with a long service life | Heavier than relay or static units of the same rating |
Running machines that can't afford voltage trips? Tell us what is on the supply and we will size the unit for it.
To choose between 25 kVA servo stabilizer manufacturers and suppliers, first check that the unit suits your load, phase balance and your site's lowest voltage. Then compare cooling, regulation, protections, in-house manufacturing, testing and local service. Ask each seller these ten questions:
Do you manufacture the stabilizer, or resell another company’s unit?
Is it three phase or single phase, air or oil cooled, and balanced or unbalanced? (Confirm your supply type before ordering. For harsh sites, ask about the enclosure’s protection against dust and moisture.)
What input range does it cover per phase? (Record your lowest voltage over a few days first.)
What output regulation, efficiency and correction speed (volts per second) does it hold? (SG Power: ±1%, 97%)
Is the winding copper or aluminium, and are the transformers made in-house?
Does it include over/under voltage, overload, phase reversal, single phasing and time delay protection, and what happens to the healthy phases if one phase fails?
Was the unit tested before dispatch, which standards does it follow, and is there a test report and user manual? (SG Power: 173 checkpoints, IS 9815 design, ISO 9001:2015, NABL lab-tested design)
Are GST, freight and installation included, and on oil-cooled units, is the first fill of transformer oil included?
Who services it near my site, and are carbon brushes and control cards available locally?
What warranty and AMC (annual maintenance contract) are offered, in writing?
Before ordering, share your load list, supply type and voltage readings with the 25 kVA servo stabilizer manufacturer. With these details, the manufacturer can confirm whether 25 kVA is right and choose the cooling, design and input range. Accurate details also give you a firm quote that won't change after a site visit.
Load list: each machine’s or appliance’s rating, and which ones run together
Supply: three phase or single phase, and whether a generator also feeds the load
Voltage readings: the lowest and highest voltage on each phase over a few days, including peak hours
Load balance: whether the phases carry similar loads or very different single-phase loads
Site conditions: indoor or outdoor, dust, heat, moisture and the space available
Output and wiring: the output voltage you need (380, 400 or 415V) and where the unit will be installed
A manufacturer designs, builds and tests the 25 kVA servo stabilizer, while a supplier or dealer resells units bought from a manufacturer. Buying from the manufacturer usually gives factory pricing, custom input ranges and direct technical support. A local supplier can be useful for fast stock delivery, as long as the manufacturer backs the service.
SG Power is both a manufacturer and a direct supplier: every unit is manufactured in its own factory and supplied directly. It also works with contractors, consultants and project buyers who need several units.
For 25 kVA servo stabilizer installation, have a qualified electrician fit the unit on the mainline after the meter. Use cables sized for about 35 A per phase and proper earthing. The installation should follow the CEA safety and electric supply regulations. Maintenance is simple: keep it clean and book a yearly service.
Place the unit on a firm, level floor in a dry, ventilated room near the main distribution board. 25 kVA air-cooled units listed online weigh about 80–130 kg, and oil-cooled units more, so ask for the exact weight and size
Never box or cover the stabilizer; it gives off some heat and needs free airflow
Connect the stabilizer’s body earth terminal to the building’s earthing system
Servo units hum while correcting, so place the unit near the distribution board, away from wards, offices and bedrooms
If an online UPS serves critical loads, connect the stabilizer first and the UPS after it, so the UPS charges from steady voltage
Check the phase sequence at installation, and connect the neutral properly
Use the bypass switch only during servicing; machines and appliances are unprotected in bypass
On oil-cooled units, check the oil level before first switch-on
Fit a surge protection device ahead of the stabilizer; a servo unit corrects slow voltage changes, not lightning spikes.
Check your earthing too. SG Power also makes earthing rods, chemical earthing electrodes, earth pit covers and lightning protection systems.
| Task | How Often | Who |
|---|---|---|
| Dust the body and vents | Monthly | User |
| Check input and output readings on each phase | Weekly | User |
| Inspect and replace worn carbon brushes | Yearly, or if correction slows | Trained technician |
| Oil-cooled units: check oil level every 3 months; test and top up with transformer oil to IS 335 yearly | 3–12 months | Trained technician |
| Full service and calibration | Yearly or under AMC | SG Power service |
Need your 25 kVA unit installed or serviced? We'll recommend the right model and arrange delivery and service in your city.
As a 25 kVA servo stabilizer manufacturer, SG Power has built servo stabilizers for 15+ years, winds its transformers in-house and tests every unit before dispatch. It offers 25 kVA models in air and oil cooling, balanced and unbalanced designs and custom input ranges. Customers in 319+ cities get factory pricing and local service.
| Why SG Power | Detail |
|---|---|
| Experience | 15+ years of manufacturing |
| Factory | 7,000 sq m in Ghaziabad, 84 machines, 250+ employees |
| Quality | 100% units tested, 173 checkpoints, NABL lab-tested design |
| Certifications | ISO 9001:2015, CE, RoHS, MSME registered |
| Customers | 5,937+ customers, service in 319+ cities |
Learn more about SG Power, or see the full servo voltage stabilizer range from 10 to 500 kVA.
Each SG Power 25 kVA servo stabilizer is tested through a 3-level quality check covering 173 checkpoints before it leaves the factory, and the company is ISO 9001:2015 certified. The servo stabilizer design has also been tested at an NABL-accredited laboratory (Hydel Laboratories) for performance and safety.
SG Power makes its 25 kVA stabilizers at its own factory in Ghaziabad, where transformers and variacs are wound and tested in-house.
SG Power supplies power and electrical safety products to government bodies, PSUs and well-known companies across India:
| Sector | Organisations |
|---|---|
| Power and utilities | POWERGRID, NTPC, BHEL, NPCL, Coal India |
| Infrastructure and metro | L&T, Alstom, Indian Railways, Shapoorji Pallonji |
| Defence and government | DRDO, Indian Army, BSF, Airports Authority of India |
| Industry and corporate | Siemens, JSW, Hindalco, JK Cement, Apollo Tyres, ICICI Bank |
Project Location - Karnataka
Power infrastructure project with advanced electrical solutions.
Project Location - Kanheri Hills
Defence sector electrical and protection systems.
Project Location - Hyderabad
Airport infrastructure and electrical safety solutions.
Project Location - Pune
Metro rail electrical installations and grounding systems.
Project Location - Ajmer
State electricity distribution network solutions.
Project Location - Jodhpur
Power distribution and earthing solutions.
Project Location - Bangalore, Noida
Heavy electrical and industrial power systems.
Project Location - Odisha
Steel industry electrical infrastructure solutions.
Project Location - Nashik, Chhattisgarh
Defence-grade electrical protection systems.
Project Location - Lucknow, Jabalpur
Telecom infrastructure and grounding systems.
Project Location - Ghaziabad
Government electronics and power systems.
Project Location - Sambalpur
Aluminium industry electrical safety solutions.
Project Location - Srinagar
Military-grade electrical infrastructure.
Project Location - Kerala
Railway electrification and protection systems.
Project Location - Rajasthan
Cement industry electrical solutions.
Project Location - Haryana
State power distribution infrastructure.
Project Location - Noida
Industrial electrical and safety systems.
Project Location - Khavda, Bikaner
Large-scale construction and power projects.
Project Location - Noida
Private electricity distribution systems.
Project Location - Chhattisgarh
Thermal power plant electrical solutions.
Project Location - Shahjahanpur
Power generation and infrastructure systems.
Project Location - Gurugram
Aviation electrical infrastructure solutions.
Project Location - Noida
Smart city electrical and infrastructure systems.
SG Power Products Pvt. Ltd. is rated 4.2 out of 5 by 132 buyers on IndiaMART (checked October 2026). The rating covers all SG Power products bought through IndiaMART, including servo voltage stabilizers, earthing products and lightning arresters.
| Source | Rating | Number of Ratings |
|---|---|---|
| IndiaMART | 4.2 out of 5 | 132 |
SG Power Products Pvt. Ltd. is a 25 kVA servo stabilizer manufacturer and supplier based in Sector 62, Noida, with its own factory in Ghaziabad. It delivers and services air-cooled and oil-cooled 25 kVA units across Delhi NCR, Uttar Pradesh and the rest of India.
SG Power is one of the 25 kVA servo stabilizer suppliers in India, with customers in 319+ cities. These cities include Noida, Delhi, Gurugram, Ghaziabad, Faridabad, Kanpur, Hyderabad, Chennai, Pune, Rajkot, Coimbatore and Bengaluru.
Want a 25 kVA unit delivered to your site? Ask for a quote, and we'll confirm the model, price and delivery.
A 25 kVA servo stabilizer carries about 20 kW at full rating; keep the running load to about 16 kW.
It draws about 35 A per phase at 415V; a 15 kW load needs about 23.4 kVA, so 25 kVA fits.
A 25 kVA three-phase servo stabilizer typically starts from about ₹60,000 + GST: air cooled from about ₹60,000, oil cooled from about ₹75,000.
SG Power makes 25 kVA models in air and oil cooling, balanced and unbalanced, at 410V ±1% phase to phase and 97% efficiency.
SG Power Products Pvt. Ltd. is a 25 kVA servo stabilizer manufacturer in Noida (Sector 62) and a supplier across India, with its own factory in Ghaziabad.
Prices are indicative. For the latest price, contact SG Power.
Contact SG Power for a free load check and the latest 25 kVA servo stabilizer price. Whether you need an air-cooled or oil-cooled, balanced or unbalanced 25 kVA unit for a factory, office or building, we'll match the model and input range to your site.