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SVR Series Voltage Stabilisers

The SVR Series by Claude Lyons is the trusted standard in automatic voltage stabilisation, offering dependable protection and precision voltage control in even the most demanding electrical environments. Designed for continuous operation, SVR stabilisers maintain a stable output voltage despite wide input fluctuations—safeguarding sensitive equipment and optimising performance across industrial, commercial, and laboratory settings.


With models ranging from single-phase to three-phase, and power capacities from kVA to hundreds of kVA, the SVR series ensures clean, regulated power where it matters most. These units are especially valuable in regions or facilities with unstable mains supply or critical electrical loads.

Key Features:


Input Voltage:
Wide tolerance (e.g., ±15%, ±20%, or custom)

Output Voltage: Regulated to within ±1% or better

Fast correction speed and precise control

Available in single- and three-phase configurations

Suitable for indoor or IP-rated outdoor installations

Designed and manufactured in the UK

Optional bypass, alarms, remote monitoring, and metering

Ideal For:

  • Industrial automation and plant equipment
  • Medical systems and diagnostic machines
  • Laboratory and test equipment
  • Data centres, telecoms, and broadcasting
  • Commercial premises and HVAC systems

Top Use Cases Include:

  • Protecting mission-critical loads from under-voltage or over-voltage
  • Stabilising voltage in unstable grid environments
  • Ensuring performance in high-precision applications

Claude Lyons’ SVR Series is the go-to solution for organisations that demand stability, safety, and service continuity in their power infrastructure.

TS Series Voltage Stabilisers

The Claude Lyons TS Series of electromechanical voltage stabilisers delivers automatic, stepless voltage regulation with industry-leading precision. Designed and manufactured in the UK, these robust units are trusted worldwide for their accuracy, reliability, and adaptability—ensuring stable output voltage even in environments with significant supply fluctuations. Using an advanced microprocessor-controlled servomechanism, TS stabilisers provide exceptional performance with no added waveform distortion and maintain tolerances as tight as ±0.32%.

Built to accommodate both single-phase and three-phase applications, the TS Series offers extensive flexibility with selectable input ranges, alternative tappings, and independent phase control—making it ideal for everything from standard industrial setups to bespoke engineered systems. With capacities up to 4000kVA, these stabilisers are designed to support critical equipment in sectors where voltage stability is non-negotiable.

Key Features:


Output accuracy:
User-selectable ±0.32%, ±0.55%, ±0.9%, or ±1.6%

Input swing range: Up to ±25% or custom (up to 450V)

Power range: 350VA to 1000kVA+ (single and three-phase)

High efficiency: Approx. 98% at full load

No waveform distortion; unaffected by frequency variation

Independent phase control on three-phase models

Alternative tappings and input ranges included as standard

Designed and engineered in the UK

Ideal For:

  • Medical and diagnostic equipment
  • Broadcasting and AV systems
  • Manufacturing and production lines
  • Communications and data centres
  • Rail, defence, and calibration labs

Top Use Cases Include:

  • Maintaining precision in laboratory and calibration environments
  • Protecting sensitive medical and diagnostic equipment from voltage fluctuations
  • Ensuring stable power for broadcasting and communications systems
  • Reducing downtime in industrial automation and production lines
  • Improving energy efficiency through voltage optimisation in commercial facilities
  • Custom integration into legacy or specialist systems via bespoke engineering solutions

The TS Series is more than just a stabiliser, it's a comprehensive voltage management solution trusted by global industries for over a century. Whether you're working in high-precision labs or harsh industrial environments, Claude Lyons’ TS Series offers stability, efficiency, and peace of mind.

Helping our customers since 1968

Lyons Instruments

Lyons Instruments Ltd (formerly part of the Claude Lyons Group, founded in 1918) is a world leader in the field of variable transformers, voltage stabilisers and power conditioning systems.

With our head office, engineering and production assembly facilities firmly placed in the United Kingdom we offer our customers the high level of quality and durability you would expect from a UK company, while maintaining competitive pricing.

We continue to support and service Claude Lyons products using our stocks of OEM parts.

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