What is a Servo Voltage Stabilizer?

A Servo Voltage Stabilizer is an electromechanical device that uses a servo motor to drive a variable autotransformer (variac), continuously correcting the output voltage to maintain a near-constant level despite fluctuations in the incoming supply. It achieves voltage regulation accuracy of plus or minus 1% to plus or minus 3%, making it the preferred choice for CNC machines, pharmaceutical equipment, printing presses, medical equipment, and other voltage-sensitive industrial loads.

What is the difference between Air Cooled and Oil Cooled Servo Stabilizers?

Air Cooled Servo Stabilizers dissipate heat through forced air fans and are compact, economical solutions for capacities up to 45 kVA in clean indoor environments. Oil Cooled Servo Stabilizers immerse the transformer core in insulating transformer oil for superior heat dissipation and are the standard for 50 kVA to 2000 kVA in dusty, humid, or harsh industrial environments.

What capacity ranges are available for servo voltage stabilizers?

Hindustan Stabilizers manufactures servo voltage stabilizers from 1 kVA to 2000 kVA in single-phase and three-phase configurations. Common capacities: 1, 2, 3, 5, 7.5, 10, 15, 20, 25, 30, 45, 50, 75, 100, 150, 200, 250, 300, 400, 500, 750, 1000, 1500 and 2000 kVA. Custom ratings are available on request.

Do you provide AMC services for servo stabilizers?

Yes. We offer three types of AMC: Comprehensive AMC (CAMC) covering parts, labour and emergency callouts; Labour-only AMC; and third-party AMC for stabilizers of any make. Coverage available across Delhi NCR, Noida, Gurgaon, Faridabad, Ghaziabad, and major Indian cities.

Is Hindustan Stabilizers ISO certified?

Yes. Hindustan Stabilizers is an ISO 9001:2015 certified manufacturer based in New Delhi, India, with over 30 years of manufacturing experience since 1995.

What is the difference between Servo and Static Voltage Stabilizers?

Servo Voltage Stabilizers use a servo motor to mechanically adjust a variable autotransformer, offering high accuracy (plus or minus 1%) and wide input range but with moderate correction speed. Static Voltage Stabilizers use solid-state switching (SCR or IGBT) to switch transformer taps electronically, offering very fast correction speed but typically with coarser voltage steps. Servo stabilizers are preferred for long-term continuous operation; static stabilizers are preferred when near-instantaneous correction is critical.

Which servo stabilizer is suitable for CNC machines?

For CNC machining centers, VMCs, HMCs, and turning centers, a Three Phase Servo Voltage Stabilizer with plus or minus 1% regulation accuracy is recommended. The kVA rating should be 125% to 150% of the total connected CNC load to account for spindle motor starting currents. For Fanuc, Siemens, and Mitsubishi CNC controls, stable input voltage within 380V to 415V is essential to prevent controller errors, servo alarms, and tool trips.

Why are copper windings preferred in servo voltage stabilizers?

Copper has approximately 60% lower electrical resistivity than aluminium, resulting in significantly lower copper losses (I2R losses), less heat generation, and higher efficiency. Copper windings also have superior mechanical strength, better resistance to thermal cycling and fatigue, and longer service life. For continuous industrial loads running 24/7, copper-wound transformers and stabilizers deliver measurably better long-term reliability and energy efficiency compared to aluminium alternatives.

How do I calculate the correct kVA rating for a servo voltage stabilizer?

Step 1: List all electrical loads with their rated kW or kVA. Step 2: Sum the total connected load in kW. Step 3: Add a 25 to 30 percent safety margin for expansion and starting current. Step 4: Divide by average power factor (0.8 for mixed industrial loads) to convert to kVA. Step 5: For three-phase installations, ensure loads are reasonably balanced across all phases. Hindustan Stabilizers provides free load assessment and capacity sizing consultation — call plus 91-+91-9971812266.

Servo Voltage Stabilizer & Transformer Manufacturer in Delhi NCR | Hindustan Stabilizers

ABOUT US

Established in 1995, Hindustan Stabilizers is an ISO 9001:2015 certified manufacturer of servo voltage stabilizers, isolation transformers and power transformers.

Hindustan Stabilizers provides industrial power quality solutions including digital servo voltage stabilizers, automatic voltage regulators, isolation transformers and power transformers for industries across Delhi NCR and India.

KNOW MORE

POWER QUALITY SOLUTIONS

PRODUCTS BY CAPACITY

Explore Hindustan Stabilizers products by phase, cooling type and capacity.

10 / 20 / 30 / 40 / 50 / 60 / 75 kVA

THREE PHASE AIR COOLED DIGITAL SERVO VOLTAGE STABILIZERS

EXPLORE CAPACITIES

50 / 55 / 60 / 65 / 70 / 75 kVA

THREE PHASE OIL COOLED DIGITAL SERVO VOLTAGE STABILIZERS

EXPLORE CAPACITIES

100 / 150 / 200 / 250 / 300 / 350 kVA

THREE PHASE OIL COOLED DIGITAL SERVO VOLTAGE STABILIZERS

EXPLORE CAPACITIES

400 / 450 / 500 / 550 / 600 / 650 / 700 / 750 / 800 / 900 / 1000 / 1100 / 1200 / 1300 / 1400 / 1500 kVA

THREE PHASE OIL COOLED DIGITAL SERVO VOLTAGE STABILIZERS

EXPLORE CAPACITIES

10 / 20 / 30 / 40 / 50 kVA

SINGLE PHASE SERVO VOLTAGE STABILIZERS

EXPLORE CAPACITIES

STEP DOWN • HT / DISTRIBUTION • ISOLATION

TRANSFORMERS

EXPLORE CAPACITIES

EXPLORE ALL CAPACITIES →

INDUSTRIES WE SERVE

Power Quality Solutions for Demanding Industries

Reliable electrical solutions engineered around the needs of critical industries.

PRINTING INDUSTRY

EXPLORE INDUSTRY

CNC MACHINES

EXPLORE INDUSTRY

TEXTILE INDUSTRY

EXPLORE INDUSTRY

PHARMACEUTICAL INDUSTRY

EXPLORE INDUSTRY

DATA CENTERS

EXPLORE INDUSTRY

HOSPITALS & HEALTHCARE

EXPLORE INDUSTRY

LEADERSHIP & VISION

A MESSAGE FROM OUR FOUNDER

"Since 1995, Hindustan Stabilizers has been building reliable power-quality solutions for demanding industrial applications across India."

Hindustan Stabilizers was established in 1995 with a simple objective: to engineer dependable electrical solutions for industries where stable power is essential. Today, we manufacture and supply digital servo voltage stabilizers, isolation transformers and power transformers with a focus on practical engineering, quality manufacturing and long-term reliability.

Our commitment remains unchanged — understand the customer's operating environment, engineer the right solution and stand behind it with dependable after-sales service.

— R.K. SINGH Hindustan Stabilizers

READ OUR STORY

— R.K. SINGH, Founder and Director, Hindustan Stabilizers New Delhi

HINDUSTAN STABILIZERS AT A GLANCE

BUILT ON EXPERIENCE. PROVEN BY PERFORMANCE.

For over three decades, Hindustan Stabilizers has delivered reliable power-quality solutions to industries, institutions and organizations across India.

EXPLORE OUR STORY →

Years of Experience

Successful Installations

Clients Across India

ISO 9001:2015

Certified Quality