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A Clean, Separate Supply for Sensitive Machines
A Servolink isolation transformer gives your equipment its own supply, electrically separated from the mains, with a fresh neutral and earth reference at the machine.
Most of the problems that trip CNC controllers, medical machines and lab instruments are not about voltage level at all. They come from a high neutral-to-earth voltage, from noise and spikes that other machines push into the line, or from a shared neutral that carries the current of the whole building. A stabilizer cannot fix these, because it is connected to the same line.
An isolation transformer can: there is no direct electrical connection between its input and output windings, so the power reaches the load only through the magnetic core, and the noise stays behind.
SERVOLINK makes single phase and three phase isolation transformers — 1 to 100 kVA single phase, 5 to 500 kVA three phase — in our own factory in Ghaziabad.
In most buildings the neutral wire is shared by many loads and runs a long way back to the main transformer. Current flowing in this shared neutral raises its voltage above earth, so at the machine the neutral-to-earth voltage can climb to several volts or more, especially when the phases are unbalanced or the earthing is weak.
Modern machines treat this voltage as an error. CNC and VMC controllers stop with alarms, medical equipment shows noise on its readings, and lab instruments drift. Many machine suppliers specify a maximum neutral-to-earth voltage and will not honour warranty above it. On top of that, noise and harmonics from neighbouring machines travel along the same wiring and reach the controller.
None of this is fixed by correcting the voltage level. The machine needs its own clean supply, with a fresh neutral bonded to earth right at the machine — and that is what an isolation transformer creates.
It has two separate copper windings on one CRGO core. The input (primary) winding creates a magnetic flux in the core, and that flux induces the output voltage in the secondary winding. There is no copper path between the two — only the magnetic path — so the output is a new, independent supply.
Between the two windings, a thin earthed copper sheet (electrostatic shield) catches the high-frequency noise that would otherwise pass from one winding to the other through their natural capacitance, and sends it to earth.
| Your problem | What solves it |
|---|---|
| Voltage goes too high or too low | Servo stabilizer |
| High neutral-to-earth voltage | Isolation transformer |
| Noise, spikes, machine errors with normal voltage | Isolation transformer |
| Both voltage fluctuation and high N-E voltage | Servo stabilizer followed by isolation transformer |
For sites with both problems, we supply the servo stabilizer and isolation transformer together, sized as one system.
| Brand | SERVOLINK |
| Product Type | Double wound isolation transformer with electrostatic shield |
| Phase | Single phase / three phase |
| Capacity | 1-100 kVA (single phase); 10-500 kVA (three phase) |
| Input Voltage | 230 V (single phase) / 415 V (three phase), or as required |
| Output Voltage | 230 V / 415 V, or as required (step up / step down on request) |
| Frequency | 50 Hz |
| Core | CRGO silicon steel |
| Winding | Copper, made in-house |
| Shield | Electrostatic (copper foil) shield between windings, brought to earth terminal |
| Neutral-to-Earth Voltage at Output | Less than 2 V |
| Insulation Class | F-Class |
| Cooling | Air cooled (dry type) / oil cooled on higher ratings |
| Enclosure | Powder coated M.S. enclosure |
| Installation | Indoor |
Because CNC controllers are sensitive to neutral-to-earth voltage and line noise. An isolation transformer creates a new neutral bonded to earth right at the machine, which brings the neutral-to-earth voltage down to almost zero and keeps noise away from the controller.
No. If the input voltage drops 10%, the output also drops about 10%. For voltage fluctuation you need a servo stabilizer; use the isolation transformer after it.
A thin earthed copper sheet placed between the input and output windings. It catches high-frequency noise and spikes and sends them to earth, so they do not reach your equipment.
Take the total kVA of the equipment it will feed and add margin for starting current. Share the machine nameplate details with us and we will suggest the right rating.
Yes. The output neutral, the shield and the body must all be connected to a good earth pit. Without proper earthing, the transformer cannot bring the neutral-to-earth voltage down.
Very little. Keep it dust-free and ventilated, and get the terminals tightened and the earthing checked once a year.
ISO 9001:20152024–2027
NSIC Registration2025–2027
MSME / UdyamRegistered 2021
Importer–Exporter CodeIssued 2019
Industrial Registration2010 record
CE — Certificate of Compliance2015–2016 record
NSIC–ONICRA Rating2016–2017 rating
ISO 9001:20152021–2024
ISO 9001:20152018–2021
ISO 9001:20082015–2018
ISO 9001:20082011–2014
At Servolink, we are committed to providing you with the best isolation transformer solutions. Whether you need assistance in selecting the right transformer for your needs or require support with your existing system, our team is here to help. Contact us today to learn more about our products and services.
Experience the reliability and efficiency of Servolink Isolation Transformers and protect your valuable electrical equipment from voltage fluctuations and electrical noise. Join our growing list of satisfied customers who trust Servolink for their isolation transformer needs.
★ 4.9
★ 4.9
★ 4.9
★ 4.9