Voltage Stabilizers – Pros and Cons of Servo Electro-Mechanical Design Based Stabilizers

For most applications Servo Electronic (AKA Electro-Mechanical) based Voltage Stabilizers & AC Power Conditioners have proved to be a very reliable and cost-efficient voltage stabilisation solution, with models readily available to accommodate an input voltage swing of in excess of 40% whilst still delivering an accuracy of 1% on the output.

Comprising a transformer having its secondary winding connected between the mains supply and the load, the primary voltage is automatically controlled through a motor driven variable transformer – ensuring a continuous, smooth and very stable output voltage.

High Voltage / Transient Spikes are normally limited by the inclusion of ‘Spike Clippers’. Such clippers typically limit transients to twice the peak voltage of the supply. However buyers should be aware that to reduce spikes to totally harmless levels it is often necessary to request that your supplier fits additional Spike Attenuation protection.

While Electronic Servo stabilisers do contain some moving parts, experience over the last 25 years in some of the most demanding power conditions has proved the design to be a very reliable method of delivering voltage regulation with only a low-level of ongoing maintenance required being deliverable by universally readily available skill sets.

The long-life expectancy, compact size and low cost of ownership makes servo electro-mechanical stabilisers economical solutions for a wide variety of applications in industry, commerce, mining, aerospace, computing and telecommunications and is normally the recommended design solution for most applications.


* Very competitively priced

* Fast speed of response to voltage changes – ideal for most applications

* Negligible output waveform distortion

* Not Frequency dependent

* Size and weight advantages over other methods of stabilisation

* Will attenuate voltage spikes if required

* Unaffected by load or power factor changes

* Low cost of ownership with ease of serviceability

* Endurable, with long life expectancy


* Moving parts requiring limited maintenance

* Lower speed of response compared to solid state designs