Custom Toroidal Transformers

The custom  toroidal power transformer range is suitable for all normal transformer applications and covers a range of power outputs from 1VA up to 10kVA when operated from a 50Hz power supply. Transformers can also be supplied for use on 60Hz and 400 Hz supplies.

SIGA transformers are designed and manufactured to optimise the inherent benefits of the toroidal type of construction, resulting in increased efficiency, reliability, reduced core losses and radiated field. The range of core sizes available allows the designer greater scope to meet the customers’s dimensional requirements.

SIGA transformers can also be supplied complying with the requirements of a number of international standards- typically EN61558, EN60950, EN60601 and UL506.

Laminated Transformers

SIGA design and manufacture a range of bobbin wound laminated transformers with power output range extending from 1VA up to 5kVA at a supply frequency of 50Hz.

All SIGA laminated transformers can be designed to conform to the latest safety standards e.g. EN60601, EN60950 and EN61558.

Ferrite Cores

SIGA production facilities extend to cover the design, manufacture and test of wound components using the standard types of core available manufactured from the modern powder magnetic materials.

Ferrite cores can be used in a wide range of toroidal and bobbin wound, inductors and transformers, and a selection of ferrite materials are available to ensure the optimum performance over a range of frequencies.

Potted Transformers

Transformers can be potted into circular shells or potting boxes to give additional protection in adverse enviromental conditions and to provide an attractive uniform package.

Plastic enclosures may be used and a range of metal shells are also available which can result in improved electromagnetic and electrostatic screening.

Special Assemblies

Since SIGA was established over 50 years ago, special coil assemblies have formed a significant proportion of the production. The experience and expertise which has been accumulated over this period, has enabled many ingenious development ideas to be brought to the production stage.

SIGA design engineers work closely with the customer’s development engineers to finalise the design necessary to produce non standard wound assemblies for special applications.

Medical Isolating

SIGA design and manufacture a wide range of transformers for the medical industry.

These can be supplied on either a stand alone unit or for assembly in customer’s equipment.

Medical Isolating transformers can be designed to meet client’s specific requirements, either toroidal or bobbin wound, and supplied either as the transformer only or assembled in a case.


  • More than fifty years experience designing, producing and selling transformers and inductors
  • Custom design and manufacture to your needs
  • Own factories in Europe and Asia
  • R&D Centres in UK, Estonia and Sri Lanka
  • Short lead time for prototypes
  • Global company