+91 8882730630
info@voltapexpower.com
ISO 9001:2015 Certified Since 1983 BIS & CE Compliant

India's Most Trusted
Servo Voltage
Stabilizer Manufacturer

Precision-engineered servo stabilizers from 5 kVA to 2000 kVA — single phase & 3 phase, air cooled & oil cooled. Protecting critical industrial assets with ±1% accuracy and 98% efficiency for over four decades.

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40+
Years of Engineering
5000+
Industrial Installations
±1%
Voltage Accuracy
98%
Operational Efficiency
Best Seller
3 Phase Servo Voltage Stabilizer
10 kVA – 2000 kVA | Air / Oil Cooled
±1% Accuracy300V–470V InputBalanced Output
Precision Grade
Single Phase Servo Stabilizer
5 kVA – 200 kVA | Air Cooled
±1% Output140V–270V Input98% Efficient
BIS Compliant  ·  CE Marked  ·  2-Year Warranty
Every unit factory-tested before dispatch. Pan-India service network.
40+
Years of Excellence
5000+
Satisfied Clients
2000
Max kVA Capacity
24/7
Technical Support
Our Product Range

Complete Servo Stabilizer
Solutions for Industry

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Industrial Grade
3 Phase Servo Voltage Stabilizer

3 Phase Servo Voltage Stabilizer

Built for heavy industry, manufacturing plants, and large commercial complexes. Handles severe voltage fluctuations, ensuring balanced, stable power for critical machinery.

10–2000 kVAAir / Oil Cooled3 Phase Balanced±1% Accuracy
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Commercial & SMB
Single Phase Servo Voltage Stabilizer

Single Phase Servo Stabilizer

Perfect for offices, retail, hospitals, and light commercial applications. Provides a rock-steady 220V output from a fluctuating 140V–270V mains supply.

5–200 kVAAir Cooled±1% Output98% Efficiency
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Specialty
Isolation Transformer

Isolation Transformers

Essential for sensitive medical (MRI/CT), laboratory, and CNC equipment. Provides complete galvanic isolation, eliminating electrical noise and ground loops.

Noise FilteringSurge ProtectionCustom RatiosMedical Grade
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Technical Insight

How a Servo Controlled Voltage
Stabilizer Works

The superior engineering behind ±1% precision and unmatched reliability for industrial loads.

01

Continuous Voltage Sensing

A high-precision sensing circuit monitors the output voltage in real-time, comparing it to the reference setpoint. Any deviation triggers immediate corrective action.

02

Control Circuit Activation

A microprocessor-based control card calculates the exact error and sends a correction signal to the servo motor, determining the direction and magnitude of adjustment.

03

Servo Motor & Brush Movement

The servo motor rotates a carbon brush along a toroidal auto-transformer (variac). Clockwise rotation boosts the output; counter-clockwise bucks it.

04

Buck-Boost Transformer Correction

The corrected voltage from the variac is fed into a series-connected buck-boost transformer, which adds or subtracts the required voltage from the mains supply.

05

Stable, Pure Sine Wave Output

The result is a stable output voltage with ±1% accuracy and a pure sine wave, free from waveform distortion common in electronic stabilizers.

Why Electro-Mechanical Beats Static for Industrial Loads

Servo stabilizers handle high inrush currents (motors, compressors) and provide a pure sine wave output, making them the only choice for CNC machines, MRI scanners, and sensitive industrial equipment above 10 kVA.

Standard Technical Specifications
Input Voltage (1φ)140V – 270V AC
Input Voltage (3φ)300V – 470V AC
Output Voltage (1φ)220V ±1%
Output Voltage (3φ)415V ±1%
Frequency50 Hz ±5%
Efficiency≥ 98% at full load
Response Time20–40 ms per 1% change
WaveformPure Sine (no distortion)
Capacity Range5 kVA – 2000 kVA
Air Cooled vs Oil Cooled
Air Cooled
  • Up to 500 kVA
  • Indoor, ventilated spaces
  • Lower cost, easier maintenance
  • Forced air ventilation
Oil Cooled
  • 200 kVA – 2000 kVA
  • Outdoor / harsh environments
  • Superior heat dissipation
  • Mineral oil immersion
Full Capacity Range

Select Your Optimal kVA
Servo Stabilizer

From light commercial loads to heavy industrial campuses — we manufacture the right size for every application. All pricing is custom-quoted based on your specific requirements.

Capacity RangeTypical ApplicationKey FeaturesInput Voltage
5 – 10 kVASmall offices, labs, retail shopsCompact, wall-mount option, ±1% accuracy140V–270V
10 – 30 kVASmall workshops, diagnostic centersAir cooled, overload protection, wide input range140V–270V
30 – 75 kVAMedium manufacturing, pharma, printingIndustrial grade, panel-mount display, auto restart300V–470V
75 – 150 kVATextile mills, hospitals, IT parksEnhanced ventilation, dual cooling fans, remote monitoring300V–470V
150 – 300 kVALarge hospitals, data centers, cold chainAir or oil cooled, IP54, heavy-duty busbars300V–470V
300 – 500 kVASteel units, packaging plants, large campusesMotorized bypass switch, SCADA-ready, surge protection280V–480V

Need Custom Pricing?

Pricing depends on capacity, phase, cooling type, input range, enclosure rating, and optional features. As a direct manufacturer, we offer the most competitive rates with zero middlemen. Tell us your load details and we'll respond within 24 hours.

Get Custom Quote Call Now

* Free site survey and load calculation available. Pan-India installation and AMC service included.

Powering Critical Infrastructure

Applications Across Key Sectors

From operating theaters to manufacturing floors, VoltaPex ensures uninterrupted, precision power.

Healthcare

MRI, CT Scanners, X-Ray, Operation Theaters, ICU. Zero downtime is critical — our ±1% accuracy ensures diagnostic precision.

Manufacturing

CNC, VMC, Injection Molding, Robotics, PLC Panels. Protects expensive machinery from voltage sags and surges.

Data Centers & IT

Servers, Network Infrastructure, Storage Systems. Clean stable power preventing data corruption and hardware failure.

Telecom

BTS Towers, Transmission Equipment, Network Hubs. Ensures connectivity and reliability by protecting sensitive hardware.

Cold Chain & HVAC

Industrial chillers, compressors, refrigeration lines. Handles inrush currents from large motors without voltage dip.

Education & Research

Laboratories, smart classrooms, ERP systems. Stable power for sensitive instruments and uninterrupted campus networks.

Airports & Defence

ATC systems, runway lighting, ground radar. Mission-critical facilities demand the reliability only servo provides.

EV Charging & Energy

DC fast chargers, solar inverter systems, battery storage. Conditioned input voltage ensures safe, efficient charging operations.

40+
Years Manufacturing Excellence
5000+
Nationwide Installations
50+
Qualified Engineers
98%
Customer Satisfaction Rate

Your Complete Guide to Servo Voltage Stabilizers

For over 40 years, VoltaPex has been India's trusted partner for power quality solutions. A servo voltage stabilizer is a critical investment in the longevity and reliability of your industrial equipment. Unlike static stabilizers that offer step-correction, our electro-mechanical servo stabilizers provide continuous, stepless voltage regulation with a pure sine wave output.

Servo Controlled Voltage Stabilizer Working Principle

A sensing circuit constantly checks the output voltage. When a fluctuation is detected, a servo motor adjusts a carbon brush on a variable auto-transformer. This "buck" or "boost" action, amplified by a series transformer, instantly corrects the voltage back to the precise setpoint (220V or 415V) with an accuracy of ±1% — without any waveform distortion.

Air Cooled vs. Oil Cooled: Making the Right Choice

Air-cooled servo stabilizers are ideal for indoor applications up to 500 kVA in clean, ventilated environments. For higher capacities, outdoor installations, or high-ambient-temperature environments, our oil-cooled stabilizers are the superior choice — the mineral oil provides superior heat dissipation for continuous heavy-load operation.

How to Calculate the Right KVA for Your Facility

Add the total wattage of all equipment, divide by 1000 for kW, then divide by the power factor (0.8 for mixed industrial loads). Always add a 20-25% safety margin. For motor-driven loads (compressors, pumps), starting current can be 3-5x the running current — our engineering team accounts for this in all sizing recommendations.

Static vs Servo Stabilizer: What's the Difference?

Static stabilizers use solid-state electronics for fast but step-corrected voltage changes, introducing waveform distortion. Servo stabilizers use an electro-mechanical system for continuous, stepless correction with a pure sine wave output, making them the only reliable choice for industrial applications above 10 kVA.

Get Manufacturer-Direct Pricing

As a direct manufacturer since 1983, we offer competitive, transparent pricing with no middlemen. Since pricing depends on capacity, phase, cooling type, and specific features, we provide customized quotes tailored to your exact needs. Contact us for a detailed proposal within 24 hours.

FAQ

Frequently Asked Questions

Have a different question? Our technical team is ready to assist.

How does a servo controlled voltage stabilizer work?
A servo controlled voltage stabilizer uses a servo motor to rotate a carbon brush across a variable auto-transformer. A sensing circuit continuously monitors the output voltage. When deviation is detected, the servo motor adjusts the brush position — either bucking (reducing) or boosting (increasing) the voltage — until stable ±1% output is restored. This process is stepless and delivers a pure sine wave without distortion.
What is the difference between air cooled and oil cooled servo stabilizers?
Air cooled stabilizers use forced air ventilation and are suited for capacities up to 500 kVA in clean, ventilated indoor environments. Oil cooled stabilizers immerse the transformer in mineral oil for superior heat dissipation, making them ideal for 200 kVA and above, outdoor installations, and high-ambient-temperature environments. They run quieter and have a longer service life.
What is the difference between a static stabilizer and a servo stabilizer?
Static stabilizers use solid-state electronics to switch voltage taps, offering fast response but introducing waveform distortion and step-correction. They are best for small, non-inductive loads. Servo stabilizers use an electro-mechanical system for continuous, stepless correction, providing a pure sine wave output and the ability to handle high inrush currents, making them the only reliable choice for industrial applications and large inductive loads.
How do I calculate the kVA rating I need?
The formula is: Total load (in kW) ÷ Power Factor = kVA. For a mixed industrial load, use a power factor of 0.8. We recommend adding a 20-25% safety margin for future expansion and to account for motor starting currents. Our team provides free load calculation services — simply share your equipment list and we'll recommend the optimal size and range.
How do you get custom pricing for a servo stabilizer?
Pricing depends on kVA capacity, phase (single or three), cooling type (air or oil), input voltage range, enclosure rating (IP54/IP55), and optional features such as APFC panels, SCADA integration, or bypass switches. Fill out our contact form or call us with your load details, site conditions, and location. As a direct manufacturer, we provide transparent, competitive quotes with no middlemen — typically within 24 working hours.
What is the typical lifespan and maintenance requirement?
A well-maintained VoltaPex servo stabilizer typically delivers 15–20 years of service. The primary maintenance task is carbon brush replacement every 2–3 years. Annual preventive maintenance should include brush inspection, contact surface cleaning, lubrication, and control card voltage checks. We offer Annual Maintenance Contracts (AMC) to keep your unit in peak condition with pan-India coverage.

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Get a free site survey, load calculation, and a competitive quote from India's most trusted servo stabilizer manufacturer.

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Contact Information

Reach us by phone, email, or visit our manufacturing facility.

Manufacturing Facility
KHAS-615, HALDAUNI
Greater Noida, Gautam Budh Nagar
Uttar Pradesh – 201306, India
Business Hours
Mon – Sat: 9:00 AM – 6:00 PM
24/7 Emergency Support Available

Available Voltage Stabilizers

5KVA Home Voltage Stabilizer

Perfect protection for your household appliances against voltage fluctuations

Residential Custom Pricing

10KVA Servo Stabilizer

Ideal for large homes and small offices with multiple electrical devices

Residential Custom Pricing

20KVA 3-Phase Stabilizer

Commercial-grade protection for shops, hospitals, and small industries

Industrial Custom Pricing

25KVA Servo Stabilizer

Heavy-duty protection for industrial machinery and commercial establishments

Industrial Custom Pricing

30KVA 3-Phase Stabilizer

For medium-scale industries and large commercial complexes

Industrial Custom Pricing

40KVA Servo Voltage Stabilizer

Ideal for growing industries and commercial use

Industrial Custom Pricing

75KVA Voltage Stabilizer

Robust protection for mid-sized manufacturing and commercial units

Industrial Custom Pricing

100KVA 3-Phase Servo Stabilizer

Enterprise-grade solution for factories and large facilities

Industrial Custom Pricing

250KVA Servo Stabilizer

Heavy industrial protection for manufacturing plants

Industrial Custom Pricing

300KVA Servo Voltage Stabilizer

Advanced protection for large-scale industrial operations

Industrial Custom Pricing

400KVA Servo Voltage Stabilizer

Ideal for heavy industry and power-critical applications

Industrial Custom Pricing

600KVA Servo Stabilizer

For large industrial complexes and power-sensitive installations

Industrial Custom Pricing

750KVA Servo Voltage Stabilizer

Heavy-duty power regulation for the most demanding industrial setups

Industrial Custom Pricing

Constant Voltage Transformer

Ultra-stable power for medical and laboratory equipment

Specialized Custom Pricing
VoltaPex Power - Premium Voltage Stabilizer Manufacturer