Offering solution-led manufacturing services since 1982

Three Phase & Single Phase Transformer Manufacturer

We manufacture transformers from 18VA up to 1MVA, and have facilities to repair or rewind transformers up to 3MVA. Our technical team can help to design, modify and reverse engineer to your specification or to agreed transformer design features. All our manufactured equipment can be supplied with full working drawings, component lists and written instructions in any language.

We pride ourselves on excellent customer service, offering short lead-times for jobs that just can't wait.

All our quality standards and procedures are monitored independently to BS EN ISO 9001:2000 and are subject to regular external and internal audits. We also work with all the leading testing and quality authorities such a BSI, DNV, Lloyds, NSN, Nemko and VDE, to give you total peace of mind.

Our transformer range

  • Air cooled transformers
  • Bespoke transformers
  • Current transformers
  • Auto-transformers
  • Isolation transformers
  • Earthing transformers
  • Marine transformers
  • Offshore transformers
  • Bushing transformers
  • Step up and step down transformers
  • Zone 1 and Zone 2 hazardous areas transformers
  • Epoxy cast resin encapsulated transformers
  • Harmonic current reduction transformers
  • Liquid cooled transformers (oil immersed)
  • Military transformers / NSN / NATO Transformers
  • Ex d, Ex o, Ex e, Ex n, Ex m, Ex p, Ex i power transformers
  • Single and three phase transformers
  • Transformer-rectifier units for D.C. power supplies
  • Winding configurations to Delta/Star, Interconnected Star, Auto Wound, Phase Shifted Scott & Tapped Delta
  • Transformers maintenance Programmes
  • Ministry of Defence transformers (a series and NSN / NATO)

Examples of completed projects

Customer: BAE Systems - 10kVA to 60kVA

To supply military standard air cooled enclosed transformers, ranging from 10KVA up to 60KVA. All transformers shock tested and approved by 'QinetiQ'. This project required us to manufacture over 200 transformers for the new Queen Elizabeth Class Aircraft Carriers being built for the British Royal Navy.

Customer: Testing Facility - Bespoke transformer

To design and manufacture a one-off air cooled transformer capable of generating 8000A at 9v. Our engineering team also produced a busbar system to allow our customer to test their equipment.

Testing transformer

Customer: Rail Sector - 500va transformer

Our engineering team were required to re-engineer a single phase obsolete 500VA transformer; our customer required the transformer to be within a size tolerance of 0.02mm.

Customer: Pilkington Glass (NSG) - Repair 750kVa

Our team attended our client's site to remove a 3 phase 750kVa transformer; which required one of the phases to be rewound. This was achieved with 2 day turnaround to ensure production was up and running as soon as possible.

Customer: Offshore platform - 9kVA Hazardous Area Transformer

Manufactured a hazardous area transformer designed to isolate and step down the incoming 440 Volts, single phase (2 Phases of Available 3), 50-Hertz supply to 240 Volts Centre tap connected to earth.

hazardous area offshore

Marine Transformer

Hazardous Area Transformers

Our in-house Engineering Team have the design and engineering capabilities to be able to manufacture transformers to meet the requirements for zone 1 and zone 2 hazardous areas. This includes Ex d, Ex o, Ex e, Ex n, Ex m, Ex p, Ex i, which are manufactured to BS EN 60079 with IECex & ATEX certification.

Having a diverse range of clients has given our team the experience of working in the Pharmaceutical, Offshore, Chemical and Petroleum sectors; offering bespoke solutions for zone 1 and zone 2 hazardous areas.

For more information regarding our hazardous area transformer range please contact us at or call 0151 486 6760.

hazardous area transformer


All military transformers (NSN, NATO stock numbers, a series) we manufacture and repair for defence applications fully comply with the shock and vibration requirements of NES 501 and DEF STAN 02-535. Our type tests also include self-induced vibration and EMC requirements for military vessels, our entire range has been shock tested by a MOD approved agency (QinetiQ).

Transformers are hard mounted to bulkheads and decks, and do not require shock mounts. All equipment is manufactured to a minimum of IP23 of BS60529 and to Cat.2 Shock Grade C. Units are naturally air-cooled, and mounted in IP rated enclosures.

To find out more information regarding our Military services please click here.

Transformer design

How healthy are your transformers?

As transformers age, the probability of failure increases, but with a proper condition assessment and maintenance program, transformers can provide reliable service for years, even decades more than the average life expectancy.

With the right maintenance and reporting, you can make the critical decisions necessary to extend the life of your transformers. These decisions could be the difference between planned, cost-effective maintenance and life extension solutions or expensive responses to preventable disasters. Make informed decisions by knowing what is happening with your critical assets. This can be accomplished through a comprehensive condition assessment program, like the one R Baker (Electrical) Ltd offers.


We manufacture and repair marine transformers for blue chip clients across the UK, and have manufactured transformers for oil platforms, commercial vessels, ocean-going yachts and specialist marine vessels.

Working with the leading offshore and marine companies, we have developed our range of transformers to be used in the arduous environments of oil rigs and other areas with high levels of vibration and humidity.

All our marine work can be carried out to marine, military or hazardous area standards and are credited to the related manufacturing authority.

To find out more information regarding our marine and offshore services please click here.

Other industrial standards

We liaise with leading industry standard authorities to meet the highest of standards and testing requirements for every industry we work in. Our highly skilled team manufactures transformers for Rail, Glass, Nuclear, Offshore and Chemical industries, which all require different exacting specifications, and we can meet any requirements you may have.

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