Servo Voltage Stabilizer Manufacturer
ISO 9001:2008 certified manufacturer of servo controlled voltage stabilizers – air cooled and oil cooled – from 1 KVA to 2500 KVA. Trusted by industries in 60+ countries since 1995.
Servo Voltage Stabilizer Types
Purevolt manufactures servo-controlled voltage stabilizers in two construction types – air cooled for moderate environments and oil cooled for heavy industrial loads and hot climates. Both are available in single-phase and three-phase configurations, balanced and unbalanced design, customised to your input/output voltage specifications.
Air Cooled Servo Voltage Stabilizer
Forced-air cooling with exhaust fans and louvers. Ideal for moderate climates and light-to-medium industrial loads.
1 KVA – 200 KVA Single & Three Phase Indoor Use View Air Cooled Range →
Oil Cooled Servo Voltage Stabilizer
Internal assembly immersed in mineral transformer oil for superior heat dissipation. Best for heavy loads, extreme heat, and outdoor/export use.
15 KVA – 2500 KVA Three Phase Outdoor / Export View Oil Cooled Range →
Single Phase Servo Stabilizer
For offices, showrooms, clinics, and light industrial loads. Available in balanced and unbalanced configurations.
1 KVA – 90 KVA 230V AC Output ±1% Regulation View Single Phase →
Three Phase Servo Stabilizer
For heavy industrial machinery, manufacturing plants, textile mills, cement plants, and cold storage. Custom-built to spec.
10 KVA – 2500 KVA 400V AC Output Balanced / Unbalanced View Three Phase →Why Your Plant Needs a Servo Voltage Stabilizer
Unstable supply voltage is one of the leading causes of unplanned machine downtime and equipment failure in India, Africa, and the Middle East. Installing a servo stabilizer is the most cost-effective way to eliminate this risk.
Voltage Fluctuations Are Unavoidable
Power transmission systems stepping down from 11kV/33kV to 415V AC are affected by load variations, causing unstable LT voltage at the consumer end – even in commercial areas.
Machines Fail at Over/Under Voltage
CNC machines, injection moulding equipment, packaging machines, and medical devices are all designed for ±5% of their rated voltage. Beyond this, failures and permanent damage occur.
Downtime Costs More Than Prevention
A single unplanned shutdown in a manufacturing plant can cost lakhs. A servo stabilizer from Purevolt typically pays for itself within the first 6-12 months through reduced maintenance costs alone.
One Solution for the Entire Plant
A centralized servo voltage stabilizer from Purevolt protects your entire factory load – not just individual machines – reducing complexity and providing a single-point power protection solution.
How a Servo Voltage Stabilizer Works
Purevolt servo stabilizers use a solid-state electronic control circuit and an AC synchronous servo motor to continuously monitor and correct output voltage in real time.
Sense Input Voltage
The PCB control card continuously monitors the incoming supply voltage and compares it with a preset reference value.
Generate Error Signal
Any deviation from the reference voltage generates an error signal, which is amplified and sent to drive the servo motor.
Servo Motor Correction
The AC synchronous servo motor rotates the arm of a dimmerstat (variable auto transformer) in the appropriate direction to correct the voltage.
Buck-Boost Output
The corrected voltage is fed through a series buck-boost transformer to deliver a stable ±1% regulated output to your equipment.
Servo Stabilizer Specifications & Capacity Range
| Specification | Single Phase | Three Phase |
|---|---|---|
| Capacity Range | 1 KVA – 90 KVA | 10 KVA – 2500 KVA |
| Input Voltage Range | 130V – 270V AC | 300V – 460V AC |
| Output Voltage | 230V AC ±1% | 400V AC ±1% |
| Frequency | 50 Hz | 50 Hz |
| Correction Speed | 25-30V/sec | 25-30V/sec |
| Cooling Type | Air Cooled (standard) | Air or Oil Cooled |
| Efficiency | 98%+ | 98%+ |
| Construction | Balanced / Unbalanced | Balanced / Unbalanced |
| Certifications | ISO 9001:2008, NABL, SONCAP (Bureau Veritas / SGS / Intertek) | |
| Warranty | 1 Year standard; extended warranty available | |
| Customization | Input/output specs, enclosure, voltage ratios – all customizable | |
Which Type Is Right for You?
Both types deliver the same ±1% output regulation. The difference is in the cooling method, maximum capacity, and operating environment.
- Offices, showrooms, hospitals, schools
- Moderate ambient temperature (<45°C)
- Capacity up to 200 KVA
- Indoor environments
- Light to medium industrial loads
- CNC machines, printing, packaging
- Lower upfront cost
- Cement plants, steel mills, oil refineries
- High ambient temperature (Africa, Middle East)
- Capacity up to 2500 KVA
- Outdoor and export installations
- 24/7 continuous industrial operation
- Textile mills, rolling mills, food processing
- Longer service life in harsh conditions
Applications of Servo Voltage Stabilizers
Wherever a stable, regulated voltage supply is critical for safe and efficient operation, a Purevolt servo stabilizer is the trusted solution.
See Our Manufacturing Facility
Watch how Purevolt manufactures and tests servo voltage stabilizers at our Okhla, Delhi factory
Countries We Regularly Export To
Purevolt exports servo voltage stabilizers to 60+ countries. Our SONCAP, ISO 9001:2008, and NABL certifications – tested by Bureau Veritas, SGS, and Intertek – are accepted in all major import markets.
Frequently Asked Questions
Clients
Trusted by MNCs, government organisations, and industrial leaders across India and 60+ countries worldwide.
User Reviews of Purevolt
Real feedback from our customers across Africa, Middle East, and Asia who trust Purevolt for their power protection needs.
Mr. Ridhwan
Tanzania
Mr. John
Nigeria
Mr. Mohammad
Iraq
Overseas Installations & Trade Shows
From 600 KVA plants in Delhi to 1000 KVA systems in Nigeria and 250 KVA units to Iraq – Purevolt stabilizers run in the world’s most demanding industrial environments.
Request a Quote or Technical Consultation
Tell us your load in KVA, input voltage range, and location – our engineers will recommend the right servo stabilizer model and send you a detailed quotation within 24 hours.