Live since 1979 · Servo Voltage Control

Every volt, held steady — no matter what the grid throws at it.

AltraVolt engineers servo-controlled voltage stabilizers and isolation transformers that turn unpredictable Indian mains power into the clean, stable supply your machinery, medical equipment, and data infrastructure depend on.

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Grid Input 187V

Stabilized Output 230V ±1%

Correction Time <20ms

CH.1 INPUT · CH.2 OUTPUT

Unregulated grid supply

AltraVolt stabilized output

Years of Excellence

Units Installed

Satisfied Clients

Countries Served

Average Efficiency

Trusted by engineering teams at

SIEMENSABBSchneiderL&T Tata PowerRelianceGodrejBoschVoltas

Product Range

Three product lines. One job: stop bad power from becoming your problem.

Select a channel to see full specifications — every unit is engineered, tested, and warrantied in‑house.

1 – 25 KVA Single-Phase Servo Stabilizer

For offices, retail, homes & light commercial

Single‑Phase Servo Stabilizer

Precision voltage regulation for sensitive electronics, diagnostic equipment, and everyday appliances. Handles a wide input swing without hunting, so lights don't flicker and compressors don't stall.

Input Range140 – 280 VAC

Output220V ±1%

Response Time< 20 ms

Efficiency> 98%

StandardIS 9815 (Pt. 1 & 2)

Warranty1 Year

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10 – 500 KVA Three-Phase Servo Stabilizer

For plants, CNC lines, HVAC & heavy industry

Three‑Phase Servo Stabilizer

Balanced, per‑phase correction for industrial motors, compressors, and 24/7 production lines. Oil‑cooled or forced‑air variants handle sustained heavy loads without derating.

Input Range300 – 480 VAC

Output415V ±1%

CapacityUp to 500 KVA

CoolingOil / Forced‑air

StandardIS 9815, IS 2026

MonitoringIoT‑ready, optional

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0.5 – 2500+ KVA Isolation Transformer

For medical, data centres & sensitive electronics

Isolation Transformer

Galvanic isolation and common‑mode noise rejection to protect patients, equipment, and data integrity. Electrostatically shielded windings keep switching noise out of critical circuits.

Dielectric Withstand4 kV

Regulation±1–2% static

Capacity0.5 – 2500+ KVA

ShieldingElectrostatic

CertificationsCE, UL, IEC 60601‑1

StandardIS 2026, IS 1180, IS 335

View Full Specifications →

Inside the Box

How a servo stabilizer corrects power in under 20 milliseconds

No relays, no step switching — just continuous, stepless correction driven by a servo motor and a buck‑boost transformer.

Sense

A microcontroller samples incoming voltage continuously, detecting even brief sags, surges, or single‑phase dips.

Compare

The reading is compared against the target output — 220V or 415V ±1% — and the deviation is calculated in real time.

Correct

A servo motor rotates a carbon‑brush roller across the buck‑boost transformer's winding, smoothly adjusting the turns ratio.

Hold

Output locks to within ±1% and stays there — no overshoot, no oscillation, even as load or supply keeps shifting.

Side by Side

Which product line fits your load?

A quick comparison across the full AltraVolt range.

Specification	Single‑Phase Servo	Three‑Phase Servo	Isolation Transformer
Capacity range	1 – 25 KVA	10 – 500 KVA	0.5 – 2500+ KVA
Typical use	Home, office, retail	Plants, CNC, HVAC	Medical, data centres, labs
Correction type	Continuous servo	Continuous, per‑phase servo	Static isolation, no moving parts
Response time	< 20 ms	< 20 ms	Instantaneous (passive)
Regulation accuracy	±1%	±1%	±1–2% static
Governing standard	IS 9815	IS 9815, IS 2026	IS 2026, IS 1180, IS 335

Why AltraVolt

Built on 45 years of power electronics expertise

Every design decision traces back to one goal: uninterrupted, compliant power for the equipment that can't afford to fail.

🏭

Industrial Grade

CRGO core laminations and heavy‑duty enclosures built for continuous operation in harsh plant environments.

📊

Smart Monitoring

Real‑time voltage, current, power factor, and temperature readouts, with optional IoT‑ready modules.

🛡️

Complete Protection

Overload, short‑circuit, over/under‑voltage, thermal, and surge protection standard on every unit.

🌱

Energy Efficient

Up to 99% efficiency cuts energy losses, lowers electricity bills, and shrinks carbon footprint.

🔧

Low Maintenance

No carbon brushes on transformers, minimal wear parts on servo units — years of trouble‑free service.

✅

Compliance Ready

Designed to IS 9815, IS 2026, IS 1180, IS 335, and international norms including IEC, CE, and UL.

Compliance

Engineered against Indian and international standards

Every AltraVolt product is tested and documented against the relevant BIS specification before it ships.

IS 9815

AC Voltage Stabilizers

Parts 1 & 2 govern electromechanical (servo) voltage stabilizer performance, safety, and test methods.

IS 2026

Power Transformers

Multi‑part specification covering general requirements, temperature rise, insulation, and fittings for transformers.

IS 1180

Distribution Transformers

Covers oil‑immersed distribution transformers up to 2500 KVA, including outdoor‑type isolation units.

IS 335

Insulating Oil

Specifies the quality of new insulating oils used in transformers and switchgear for dielectric performance.

IEC 60601‑1

Medical Electrical Equipment

International safety standard referenced for isolation transformers supplying medical‑grade circuits.

European Conformity

Self‑declared conformity with EU health, safety, and environmental protection requirements for export units.

Underwriters Laboratories

Recognized component certification supporting North American export and OEM integration.

IEC 61558

Safety of Transformers

International equivalent framework for isolating transformer and power supply unit safety.

Field Reports

"AltraVolt's three‑phase stabilizers kept our CNC lines running flawlessly during voltage dips. Zero downtime in 2 years."

Plant Head — Tata SteelJamshedpur, India

"The isolation transformers we sourced from AltraVolt are a benchmark for medical‑grade safety and noise immunity."

Procurement Lead — Siemens HealthineersBengaluru, India

"We deployed 150+ single‑phase units across our retail chain. The energy savings paid back the investment in 11 months."

Operations Director — Reliance RetailMumbai, India

Common Questions

Frequently asked questions

Add up the running kVA of everything on the circuit, then apply a 20–25% headroom margin for motor starting current and future expansion. Our team can also review your electricity bill or nameplate data and recommend an exact KVA rating free of charge.

Relay‑type units correct voltage in fixed steps using switching contacts, which causes audible clicking and steps in output. Servo stabilizers use a motor‑driven variable transformer for smooth, stepless, silent correction with tighter accuracy.

Standard isolation transformers provide static (fixed‑ratio) regulation of roughly ±1–2%, not dynamic correction. For applications needing both isolation and tight dynamic regulation, we offer combined servo‑isolation configurations — ask our team.

All products carry a 1‑year manufacturer's warranty covering parts and workmanship, backed by a pan‑India service network. Extended AMC (annual maintenance contract) plans are available for industrial installations.

Yes. We regularly export to the Middle East, Africa, and Southeast Asia, with units configured for local voltage standards and CE/UL documentation where required for customs and compliance.

Power Knowledge Hub

Insights on stabilization, isolation & power quality

Technology

Why servo stabilizers outperform relay types

Servo stabilizers offer continuous, stepless correction with ±1% accuracy, silent operation, and no relay switching noise.

Safety

The role of isolation transformers in patient safety

Galvanic isolation protects patients in hospitals, eliminates ground loops in data centres, and reduces electrical noise.

Compliance

A plain‑English guide to BIS standards

Understanding IS 9815, IS 2026, and IS 1180 is crucial for compliance — we break down the clauses that actually matter.

Ready to power up?

Get a custom quote, request technical datasheets, or schedule a site survey. Our engineering team is ready to help with selection, sizing, and integration.

✓ Response within 24 hours
✓ Free technical consultation
✓ Pan‑India delivery & installation support
✓ 1‑Year warranty on all products

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