Among Noida-based 250 kVA servo stabilizer manufacturers, SG Power Products Pvt. Ltd. builds oil-cooled three-phase models in its own Ghaziabad factory. A 250 kVA servo stabilizer holds the voltage steady for a running load of up to about 160 kW. It suits factories, plastics and textile units, hospitals, hotels, malls and large commercial buildings.
As direct 250 kVA servo stabilizer suppliers, we sell to plant owners, contractors, consultants and project buyers across India, with no trader's margin.
In short, a 250 kVA servo stabilizer is a three-phase, oil-cooled unit for running loads up to about 160 kW, allowing a 25% safety margin. It draws about 348 A per phase at 415V and holds the output within ±1% at 97% efficiency, tested as per IS 2026 (Part 1):1977.
| Capacity | 250 kVA (250,000 VA, about 200 kW at a 0.8 power factor) |
| Recommended running load | Up to about 160 kW, allowing a 25% safety margin |
| Phase | Three phase, four wire (415V supply) |
| Cooling | Oil cooled |
| Input range | 170–280V per phase (340–480V phase to phase); custom ranges 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 348 A per phase at 415V |
| 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 |
| Price | On request, after a free load and site-voltage check |
| Testing | 100% units tested, 173 checkpoints, NABL lab-tested design |
Prices are indicative. For the latest price, contact SG Power.
Buy your 250 kVA servo stabilizer direct from SG Power, the manufacturer that designs, winds and tests every unit for factories, hospitals and large buildings. You get factory pricing, a free load and site-voltage check, and an input range, design and protections 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 |
| Input range and balanced or unbalanced design built to order | 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 network in 127+ cities | Depends on the reseller |
Many 250 kVA servo stabilizer suppliers resell stock models, while SG Power builds each unit for your load and site voltage.
A 250 kVA servo stabilizer is an oil-cooled, three-phase voltage stabilizer rated for 250,000 VA, or about 200 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 when the mains rises (swells) or falls (sags). One unit protects a whole plant or building.
It is also called a 250 kVA servo voltage stabilizer, a 250 kVA 3 phase servo stabilizer or a 250 kVA automatic voltage regulator (AVR). Buyers also search for a 250 kVA voltage stabilizer, a 250 kVA servo controlled voltage stabilizer or a 250 kVA industrial voltage stabilizer. Other names include a 250 kVA automatic voltage stabilizer, a servo automatic voltage stabilizer and a heavy duty voltage stabilizer, and some buyers simply type servo stabilizer 250 kVA. It is sometimes spelt 250 kVA servo stabiliser or typed as 250kva. A 250 kVA rating means 250,000 volt-amperes, not 250 watts.
The variac is a variable autotransformer, often called a dimmer, turned by a servo motor. A three-phase unit has one variac, buck-boost transformer and servo motor for each phase. It gives smooth, stepless voltage correction for everyday voltage fluctuations, so machines get a stabilized supply and continuous voltage stabilization. Steady voltage prevents motor overheating, nuisance tripping of drives and PLC resets during voltage dips. For a step-by-step explanation, read how a servo stabilizer works. SG Power's KNEUTRON range covers 10 to 500 kVA within its servo voltage stabilizer lineup.
The 250 kVA servo stabilizer price in India depends mainly on the input voltage range, balanced or unbalanced design, and build quality. SG Power quotes each 250 kVA unit on request after a free load and site-voltage check, so the price matches your site. Complete oil-cooled 250 kVA units listed online mostly cost about ₹2,25,000 to ₹4,50,000.
| 250 kVA Model | Input Range (per phase) | Best For | SG Power Price (+ GST) | Online Listings (approx.) |
|---|---|---|---|---|
| Three phase, oil cooled, standard range | 170–280V | Factories, hospitals and buildings with normal supply | Price on request | ₹2,25,000 – ₹4,50,000 |
| Three phase, oil cooled, wide range (custom) | e.g. 140–280V | Industrial areas at the end of long supply lines | Price on request | ₹5,00,000 – ₹7,80,000 |
| Three phase, oil cooled, unbalanced design | 170–280V | Buildings where each phase feeds different single-phase loads | Price on request | ₹3,50,000 – ₹4,00,000 |
The online figures are what other sellers list, not SG Power's prices. Prices are indicative. For the latest price, contact SG Power.
Online, 250 kVA servo stabilizer prices range from placeholder figures such as ₹1.75 or ₹11,000 to over ₹7,50,000, because sellers list very different products under the same rating. Input range, design, efficiency, oil and GST all change the figure. Listings under ₹1,00,000 are usually for air-cooled units, range listings or errors.
One published price list for unbalanced, oil-cooled units with a 400V ±1% output shows how much the input range alone changes the price:
| Input Range (phase to phase) | About the Same per Phase | Listed Price, Excluding Oil and GST | Oil Quantity |
|---|---|---|---|
| 340–470V | 196–271V | ₹3,49,830 | about 700 litres |
| 300–460V | 173–266V | ₹3,96,405 | about 800 litres |
| 270–470V | 156–271V | ₹5,01,975 | about 900 litres |
| 240–480V | 139–277V | ₹6,22,035 | about 1,000 litres |
| 190–480V | 110–277V | ₹7,78,320 | about 1,100 litres |
This is another seller's published list, not SG Power's. Prices are indicative. For the latest price, contact SG Power.
The widest range costs more than twice the narrowest, and that list excludes oil. Compare the input range, design and total delivered cost, not just the headline 250 kVA 3 phase servo stabilizer price.
To check a 250 kVA servo stabilizer listing, match its phase, power, current, input range, efficiency and oil against a true 250 kVA three-phase unit. Online listings sometimes show an air-cooled or single-phase 250 kVA unit, a single input figure, or a weight too low for the oil. Each points to an error or a different product.
| Check | True 250 kVA Three-Phase Unit | Red Flag in a Listing |
|---|---|---|
| Price | Usually ₹2,25,000 or more for a complete oil-cooled unit | A placeholder price (such as ₹1.75 or ₹11,000), a wrong currency symbol, or a “100 to 250 kVA” range listing priced for the smallest model |
| Phase and capacity | Three phase, four wire, 250 kVA throughout the listing | “Single phase” 250 kVA with three-phase figures such as 200 kW, or a different capacity in the specifications |
| Cooling | Oil cooled | “Air cooled” at 250 kVA with no temperature rise or duty stated, or “air cooled, oil cooled” both ticked |
| Power | About 200 kW at 0.8 power factor | 250 kW, with kVA shown as kW |
| Current | About 348 A per phase at 415V, or about 361 A at 400V | Not stated |
| Input range | Per phase (e.g. 170–280V) or phase to phase (e.g. 340–480V) | One figure only, such as “415V input” |
| Output | 410V ±1% (P-P), settable to 380, 400 or 415V | No regulation figure such as ±1% |
| Efficiency | Stated and tested to a standard, such as 97% to IS 2026 (Part 1) | 95% or less, which wastes about 70% more heat |
| Oil and weight | Oil quantity stated; 700 litres or more of oil alone weigh over 600 kg | No oil quantity, or a total weight lower than the oil itself (such as “500 kg approx”) |
| Frequency and accuracy | 50 Hz supply; ±1% output accuracy and correction rate in volts per second, stated separately | “60 Hz”, or “±1%” given as the correction speed |
| Use | Factories, hospitals, hotels and large buildings | “Ideal for home use” on a 250 kVA unit |
| Price basis | GST, freight, oil and installation stated | A bare price with no terms |
Prices are indicative. For the latest price, contact SG Power.
Efficiency matters at this size. At a 160 kW load, a 95% efficient unit loses about 8.4 kW as heat, while SG Power's 97% unit loses about 4.9 kW. Have a quote already? Send it with your load list, and we'll check it against your site at no cost.
Get a Free Quote CheckA 250 kVA servo stabilizer for low-voltage sites can be built with a wider input range, such as 140–280V per phase, instead of the standard 170–280V. It suits industrial areas where voltage often drops below 170V per phase. A standard stabilizer would cut off there, while a wide-range model keeps correcting.
Record the lowest voltage on each phase over a few days, including peak hours. If it stays above 170V, the standard range is enough and costs less. The catalogue lists 140–280V models up to 60 kVA, so a wide-range 250 kVA unit is built to order. If voltage stays low all day, ask your electricity distribution company (DISCOM) to check the transformer tap setting first.
A 250 kVA servo stabilizer can run a load of about 200 kW at full rating. For safe everyday use, keep the running load to about 160 kW, which leaves a 25% margin for the surge when motors, compressors and lifts start. Spread the load evenly across the three phases.
Add up the rated power (kW) of every machine 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: from 201 to 250 kVA means a 250 kVA unit; above it, choose 400 kVA or ask about a custom rating.
Sizing formula: Required kVA = (running load in kW ÷ 0.8) × 1.25. For example, a 150 kW load needs about 234 kVA, so 250 kVA is the right size.
If you know the current instead: kVA ≈ 0.72 × the highest current per phase at 415V. About 348 A on the most loaded phase means 250 kVA.
If your motors are rated in HP: multiply HP by 0.746 to get kW. A 160 kW running load is about 215 HP, so a single 200 HP motor (about 149 kW, needing about 233 kVA) fits a 250 kVA unit. A 250 HP motor (about 187 kW) needs about 292 kVA, so choose 400 kVA.
Leave out loads that do not need it: heaters, ovens and furnaces work on almost any voltage. Keeping them on a separate feeder and stabilizing only motors, machines and electronics can cut the stabilizer size and cost.
| Example Load | Running Load | Is 250 kVA Right? |
|---|---|---|
| Machine shop: twenty to twenty-four mid-size CNC machines and compressors | about 135–155 kW | Yes |
| Plastics unit: eight or nine injection moulding machines with a chiller | about 140–155 kW | Yes |
| Hospital: equipment, ACs, lifts and lighting | about 150 kW | Yes |
| Hotel or mall: about sixty 1.5 ton ACs, lifts and lighting | about 155 kW | Yes |
| Textile unit: looms, compressors and humidification | about 148 kW | Yes |
Not sure about your load? Send us your machine list and voltage readings, and we will confirm the right rating for your site.
Get Free Sizing AdviceChoose between a 200 kVA, 250 kVA and 400 kVA servo stabilizer by running load. Use 200 kVA for up to about 128 kW, 250 kVA for up to about 160 kW and 400 kVA for up to about 256 kW. A 180 kW load needs about 281 kVA, so it needs 400 kVA.
| 200 kVA | 250 kVA | 400 kVA | |
|---|---|---|---|
| Full rating (0.8 power factor) | about 160 kW | about 200 kW | about 320 kW |
| Safe running load (25% margin) | about 128 kW | about 160 kW | about 256 kW |
| Current per phase at 415V | about 278 A | about 348 A | about 557 A |
| SG Power cooling | Oil cooled | Oil cooled | Oil cooled |
| SG Power price (+ GST) | Price on request | Price on request | Price on request |
Prices are indicative. For the latest price, contact SG Power.
SG Power's catalogue has no 300 kVA model, so loads between about 160 and 256 kW move up to 400 kVA, or to a custom rating built to order. Compare the 125 kVA and 150 kVA servo stabilizer, the 200 kVA servo stabilizer, the 3 phase stabilizer range and the full servo stabilizer price list. Most sites with a load this large take an HT (11 kV) supply with their own distribution transformer. There, the stabilizer sits on the LT side, or an HT AVR transformer can regulate voltage at the source. The 400 kVA page is not live yet; ask us for its specification and price.
Not sure whether 250 kVA is enough? Share your machine list, and we'll recommend the right size.
A 250 kVA single phase servo stabilizer is rarely practical. At 230V it would carry about 1,087 A, which needs very heavy cables, switchgear and a dedicated supply. Utilities in India supply loads of this size as three phase, so a three-phase unbalanced 250 kVA unit, correcting each phase separately, is the usual choice.
| Single Phase 250 kVA | Three Phase 250 kVA | |
|---|---|---|
| Current | About 1,087 A at 230V | About 348 A per phase at 415V |
| Supply | Needs a dedicated single-phase feed, not a normal utility connection | Standard three-phase, four-wire LT or HT supply |
| Cables and breakers | Very large conductors and switchgear | Normal industrial sizes for 348 A per phase |
| Single-phase loads | All on one phase | Spread over three phases; an unbalanced design corrects each one |
SG Power's single-phase servo stabilizers come in 10 kVA and 15 kVA, and its 250 kVA units are three phase.
A 250 kVA servo stabilizer is oil cooled because its transformers carry about 348 A per phase at full load. Oil removes that heat far better than air; this cooling method is called ONAN (oil natural, air natural). SG Power's air-cooled range stops at 50 kVA, so every 250 kVA oil cooled servo stabilizer suits continuous, heavy industrial duty.
| What Oil Cooling Gives You | What to Plan For |
|---|---|
| Steady temperature under continuous full load | A firm, level plinth for a heavy unit |
| Better tolerance of hot, dusty and humid sites | Oil level checks every three months |
| Longer insulation life in 24×7 operation | Yearly oil testing and top-up with transformer oil to IS 335 |
| Suits factories, cold storage and process lines | Space around the tank for airflow, cable entry and servicing |
A 250 kVA oil-cooled servo stabilizer is a heavy, floor-standing cabinet with an oil tank. Published price lists show about 700 to 1,100 litres of transformer oil for 250 kVA, depending on the input range. Oil alone at that volume weighs about 600 kg to almost a tonne, so ask for the exact weight with oil.
Ask for exact dimensions before planning the room, and check that doors, ramps and the floor can take the unit. Ask whether it sits on a skid base or wheels, and whether the first oil fill is included in the price.
A balanced 250 kVA servo stabilizer corrects all three phases together, while an unbalanced one corrects each phase on its own. Balanced suits three-phase motors and production lines that load each phase equally. Unbalanced suits hospitals, hotels, malls and buildings where each phase feeds different single-phase loads, such as ACs and lighting.
| Balanced | Unbalanced | |
|---|---|---|
| How it corrects | All phases together | Each phase separately |
| Best for | Motors, CNC machines, injection moulding, compressors | Hospitals, hotels, malls, commercial buildings |
| Cost | Lower | Higher |
SG Power makes both balanced and unbalanced 250 kVA designs. An unbalanced model also runs balanced loads, and copes with phase imbalance coming from the supply, such as one low phase at the end of a long line. Large oil-cooled models carry a separate meter for each phase, so the operator can watch all three phases at a glance.
These technical 250 kVA servo stabilizer specifications are for SG Power's oil-cooled, three-phase, four-wire model. It accepts 170–280V per phase (340–480V phase to phase) as standard, with wider ranges built to order, and holds 410V ±1% phase to phase at 97% efficiency, tested as per IS 2026 (Part 1):1977. The output delay is adjustable from 3 to 200 seconds.
| Parameter | Specification |
|---|---|
| Capacity | 250 kVA, three phase, four wire |
| Input voltage range | 170–280V per phase (340–480V phase to phase); custom ranges on request |
| Output voltage | 410V ±1% (P-P), 230V ±1% (P-N); settable to 380, 400 or 415V |
| Regulation | ±1% |
| Efficiency | 97%, tested as per IS 2026 (Part 1):1977 |
| Output frequency | 50 Hz ±3% |
| Output delay | 3–200 seconds, adjustable |
| Cooling | Oil cooled, transformers immersed in oil |
| Control | KNEUTRON microcontroller, true RMS sensing without a control transformer |
| Motor | High-torque AC stepper motor |
| Winding | Pure copper winding |
| Housing and mounting | Powder coated CRC sheet, floor mounted |
| Insulation resistance | 7 mega-ohms, tested at 500V DC |
| Leakage current | 32 micro-amperes, tested as per IS 302-1:1979 |
| Transformer | Transformers and variacs wound and tested in-house on grain-oriented (CRGO) silicon steel; built to IS 9815 (Part 1):1984, IS 5142 and IS 2026 |
| Design | Balanced or unbalanced |
| Duty | 100% load, continuous |
The IS standards are published by the Bureau of Indian Standards. SG Power's catalogue lists oil-cooled models from 25 kVA up to 500 kVA, including 75, 100, 125, 150, 200, 250, 400 and 500 kVA, all with a standard 170–280V per phase input.
Need a 250 kVA unit built to these specifications, a custom input range or the KNEUTRON catalogue? Share your voltage readings and we will quote the right build.
Every SG Power 250 kVA servo stabilizer has 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, with an adjustable trip time delay. Calibration is done on a touch-pad, without potentiometers.
The display shows: phase-to-neutral and phase-to-phase voltage, frequency and the output current of each phase, with Start, Stop and Menu keys on the front panel. True RMS sensing samples the voltage at a high rate, so the reading and correction stay accurate. You can set the output voltage and the input voltage band, and choose manual or automatic start and stop.
| Protection | What It Guards Against |
|---|---|
| Over-voltage cut-off | High mains voltage reaching machines and equipment |
| Under-voltage cut-off | Very low voltage that overheats motors |
| Overload cut-off | Load above the set limit; the display shows “Overload”, and the output restarts once the load is reduced and Start is pressed |
| 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 and lifts backwards; the display shows “Ph. Reversal”, and the unit restarts once two incoming phases are interchanged and Start is pressed |
| Single phasing protection | Loss of one phase, which can burn out three-phase motors |
A 250 kVA servo stabilizer is used where a three-phase running load of about 129 to 160 kW needs constant voltage despite mains fluctuations. Typical users are factories, plastics, textile and printing units, machine shops, hospitals, hotels, malls, cold storage plants and large commercial buildings.
250 kVA servo stabilizer for factory use: a 250 kVA industrial servo stabilizer for production lines, pharma, food processing and packaging machines, steel fabrication, chillers and boilers
250 kVA servo stabilizer for CNC machines: twenty to twenty-four mid-size CNC lathes or VMCs on one supply; for drives with heavy harmonics, ask about a K-rated isolation transformer
250 kVA servo stabilizer for textile, plastics and printing units: injection moulding and PET blow moulding machines, offset presses, looms and their chillers and compressors
250 kVA stabilizer for hotels, malls, institutions and apartments: ACs, VRV/VRF systems, lifts, pumps, kitchens and lighting across several floors
For cold storage, mushroom growing units, water bottling, industrial RO and process plants: compressors, pumps and filling lines that run round the clock
For data centres, telecom, IT, SCADA and research sites: equipment rooms, servers, control systems and laboratories, with the UPS after the stabilizer
250 kVA stabilizer for hospitals: multi-speciality hospitals and MRI or CT diagnostic centres, usually with an unbalanced model; pair with an isolation transformer for sensitive medical equipment
At 250 kVA, a servo stabilizer's main advantages are a precise ±1% output, smooth stepless correction and full load carried continuously. Its limitations are carbon brush wear, slower correction than a static stabilizer and no electrical isolation, so fast 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 a yearly service is needed |
| Handles full load continuously, including motors and lifts | Corrects more gradually than a static (IGBT) stabilizer |
| Lower cost than a static stabilizer of the same rating | No galvanic isolation; add a surge device, or an isolation transformer for sensitive loads |
SG Power's KNEUTRON 250 kVA models use a dimmer-type variac with a buck-boost transformer. Linear servo designs, and rolling-contact designs that use a roller instead of a carbon brush, are also sold at this rating.
A 250 kVA servo voltage stabilizer benefits big companies by holding every phase of the plant supply within about ±1%, whatever the grid does. Motors run cooler, PLCs and drives stop resetting, and production lines avoid unplanned stops. One mainline unit protects a whole building or plant section from a single point.
| Benefit | What It Means for a Big Company |
|---|---|
| Less downtime | Fewer trips and resets on CNC lines, presses and process plants |
| Longer equipment life | Motors, compressors and drives avoid overheating on low voltage and stress on high voltage |
| Steadier product quality | Fewer rejects in printing, moulding and textile lines when the voltage dips |
| Lower repair costs | Fewer motor rewinds, drive repairs and control card failures |
| Works on grid and DG | Installed after the changeover, it protects the load on both supplies |
| Supports UPS systems | Keeps UPS units on mains, so their batteries cycle less |
Running machines that can't afford voltage trips? Share your load list and voltage readings for a free check.
To choose between 250 kVA servo stabilizer manufacturers and suppliers, first check that the unit suits your load, phase balance and lowest site voltage. Then compare regulation, efficiency, protections, oil-cooled build, in-house manufacturing, testing and local service. Ask each seller these nine questions:
Do you manufacture the stabilizer, or resell another company’s unit?
Is it balanced or unbalanced, and what input range does it cover per phase?
What output regulation, efficiency, correction rate (volts per second), response time and short-term overload capacity does it have?
Are the transformers made and tested in-house, and how much oil does the unit hold?
Does it include over- and under-voltage, overload, phase reversal and single phasing protection, plus a time delay?
Is there a routine test report, a user manual, and sites where your units have run for years?
Are GST, freight, installation, a bypass switch or bypass MCCB, an input MCCB and the first oil fill included?
Who services it near my site, are carbon brushes and control cards available locally, and what AMC and warranty terms are offered in writing?
Will you check the site’s power quality before quoting, and is remote monitoring or data logging available?
For more on comparing makers across all ratings, read our guide to automatic servo voltage stabilizer manufacturers in India.
A good tender specification for a 250 kVA servo stabilizer lists the rating, input range, output accuracy, cooling, protections, bypass and site conditions on one sheet. Consultants and purchase teams can then compare every quote on the same basis. Ask each bidder to confirm each line in writing, with test documents.
| Item | What to Specify |
|---|---|
| Rating and duty | 250 kVA, three phase, four wire, continuous duty at 100% load |
| Input and output | Input range per phase or phase to phase from your readings; 410V ±1% phase-to-phase output, settable to 380, 400 or 415V, with the efficiency and no-load loss stated and tested |
| Cooling and construction | Oil cooled (ONAN), buck-boost transformer, transformer oil to IS 335, oil level and oil temperature indicators |
| Electrical design | Insulation class (for example Class B or F), star/star vector group, frequency range (for example 47–53 Hz), high-voltage withstand test (for example 1.5 kV for one minute) and insulation resistance |
| Overload and correction | Short-term overload rating (for example 110%, or 120% for one minute), correction rate (volts per second) and response time, stated by the bidder |
| Protections | Over- and under-voltage, overload, phase failure, phase reversal, over-temperature, and surge protection ahead of the unit |
| Display and logging | Input and output voltage, current on each phase and frequency; optional event log (hours on mains and DG, peak current, low-voltage cut-off count) and password-protected settings; remote monitoring (Modbus or IoT) and alarms where needed |
| Supply and load type | Grid and DG sources (for example grid plus two DG sets); suitable for non-linear loads such as VFDs, UPS systems and LED lighting |
| Bypass and switchgear | Manual bypass, or automatic bypass where the load cannot stop; input and output MCCB sized for about 348 A per phase (for example 400 A) |
| Site conditions | Indoor or outdoor, ambient temperature range (for example 0–55°C), humidity (for example up to 95% non-condensing), dust-protected enclosure (IP rating, for example IP23) with anti-corrosion coating, and tropicalised control cards for hot, humid sites |
| Documents | IS 9815, data sheet, general arrangement drawing, single line diagram, routine test certificate and factory acceptance test report |
Government departments, PSUs and universities often buy 250 kVA units through GeM (Government e-Marketplace) or open tenders. The same table works as a checklist for those bids.
To install a 250 kVA servo stabilizer, have a qualified electrician install and commission it on the mainline after the meter or DG changeover. Size the input cables for the input current at your lowest voltage, about 489 A per phase at 295V phase to phase. Follow the CEA safety and electric supply regulations, and book a yearly service.
Place the unit on a firm, level plinth in a dry, ventilated room near the main LT panel
Check the oil level and phase sequence before first switch-on, and connect the neutral properly
Connect any UPS after the stabilizer, never before it
Use the bypass switch only during servicing; machines are unprotected in bypass
Terminate cables with crimped lugs and double compression glands; SG Power makes lugs for 6–300 sq mm conductors and brass glands up to 4C × 300 sq mm
Connect the body to the building's earthing system, using earthing rods or a chemical earth electrode, earthing clamps and an earth pit cover
Large 250 kVA runs often use single-core cables per phase; lay them in trefoil clamps on a cable tray to limit heating
Fit a surge protection device ahead of the stabilizer; forum users report fires and damaged stabilizers when an 11 kV line touched the low-voltage line. Protect the site in three layers: TruSafe earthing, Surge Protekt surge protection devices and Thunder Guard lightning protection (IEC 62305), with all earths bonded together
| Task | How Often | Who |
|---|---|---|
| Check input and output readings on each phase | Weekly | User |
| Check oil level and leaks | Every 3 months | Electrician |
| Inspect and replace worn carbon brushes | Yearly, or if correction slows | Trained technician |
| Test oil condition (breakdown voltage, as per IS 1866) and top up | Yearly | Trained technician |
| Full service and calibration | Yearly, or under an AMC or comprehensive AMC (CAMC) | SG Power service |
For the full step-by-step process, read the servo stabilizer installation guide.
Safety: dangerous voltages are present inside the cabinet even when the output is off. Only a qualified electrician should install or open the unit, and only after it is isolated from the supply.
Need your 250 kVA unit installed or serviced? We'll recommend the right model and arrange delivery and service in your city.
Buyers choose SG Power as their 250 kVA servo stabilizer manufacturer because it has built servo stabilizers for 15+ years, winds its transformers in-house and tests every unit before dispatch. It offers balanced and unbalanced 250 kVA designs with custom input ranges, and 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 |
| Certifications | ISO 9001:2015, CE, RoHS, MSME registered |
| Customers | 5,937+ customers in 319+ cities; service network in 127+ cities |
| Exports | Kenya and Saudi Arabia |
| Related products | Isolation transformers from 10 to 2000 kVA, K-rated transformers (K1, K13, K20) for harmonic loads, linear servo voltage stabilizers, earthing and lightning protection |
Learn more about SG Power.
Each SG Power 250 kVA servo stabilizer is made at SG Power's own factory in Ghaziabad and passes a 3-level quality check covering 173 checkpoints before dispatch. The servo stabilizer design has been tested at an NABL-accredited laboratory (Hydel Laboratories), and the company is ISO 9001:2015 certified.
SG Power supplies servo stabilizers and other 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. The individual reviews can be read on IndiaMART.
| Source | Rating | Number of Ratings |
|---|---|---|
| IndiaMART | 4.2 out of 5 | 132 |
SG Power Products Pvt. Ltd. is a 250 kVA servo stabilizer manufacturer and supplier in Sector 62, Noida, with its own factory in Ghaziabad. It manufactures, supplies and services 250 kVA units across Delhi NCR, Uttar Pradesh and the rest of India. Buyers looking for a 250 kVA servo stabilizer in Delhi, Noida or Gurugram get local sizing and service.
Looking for the 250 kVA servo stabilizer price in Noida? Ask for a quote with the full delivered cost. If you searched for 250 kVA servo stabilizer suppliers near me, our Sector 62 office and Ghaziabad factory serve the whole NCR. We supply industrial areas such as Noida Sectors 57–65 and Phase 2, Greater Noida, Sahibabad, Okhla, Faridabad and Gurugram.
SG Power is one of the 250 kVA servo stabilizer suppliers in India, with customers in 319+ cities. These include Noida, Delhi, Gurugram, Ghaziabad, Faridabad, Kanpur, Hyderabad, Chennai, Pune, Ahmedabad, Coimbatore and Bengaluru.
SG Power Products Pvt. Ltd.
17th Floor, L-17-1714B, The Iconic Corenthum, Plot No. A-41, Sector 62, Noida, Gautam Buddha Nagar, Uttar Pradesh 201309
Email: enquiry@sgpower.co.in · Contact page
Want a 250 kVA unit delivered to your site? Ask for a quote, and we'll confirm the model, price and delivery.
These are the main facts about a 250 kVA servo stabilizer, in short form for quick reference:
Current: about 348 A per phase at 415V, and about 489 A input at 295V phase to phase.
Sizing: a 150 kW load needs about 234 kVA, so 250 kVA fits; above 160 kW, choose 400 kVA.
Price: on request from SG Power; complete oil-cooled units listed online mostly cost about ₹2,25,000 to ₹4,50,000.
Design: SG Power’s 250 kVA three phase servo stabilizer comes in balanced or unbalanced designs, with custom input ranges built to order.
Build: oil cooled, 170–280V per phase, at 410V ±1% phase to phase and 97% efficiency tested to IS 2026 (Part 1).
Oil: about 700–1,100 litres of transformer oil on a published price list, depending on input range.
Maker: SG Power Products Pvt. Ltd., a 250 kVA servo stabilizer manufacturer in Noida (Sector 62), with its own factory in Ghaziabad.
Prices are indicative. For the latest price, contact SG Power.
Prices are indicative. For the latest price, contact SG Power.
For the latest 250 kVA servo stabilizer price, contact SG Power for a free load check and a written quotation. Whether you need a balanced or unbalanced, standard or wide-range unit for a factory, hospital or building, we'll match the model and input range to your site.