Power Assemblies and Controllers

Circuit Protection

Transformer and Mu Metal Cores

GD Rectifiers are a leading distributor of Torodial, Soft Ferrite, Amorphous and Nanocrystalline Laminated Cores and Powder Cores. They offer a wide range of Transformer and Mu Metal Cores from Telcon and Sirio.



Toroidal Cores

Telcon high permeability strip wound cores are manufactured to the highest international standards, in a range of alloys and sizes developed to meet the most stringent specifications, and are used in a variety of applications. Core manufacturing, including winding and heat treatment, is carried out and controlled using processes and machines specially developed by Telcon.

There are a variety of finishes to the cores from Epoxy Resin Coated, Impregnated, Loctite, Plain or Cased.


Telcon Torodial Cores


Soft Ferrite Cores

Soft ferrite is the most popular and cost effective material used in high frequency applications.

In high frequency power conversion system ferrite materials have saturation flux in the range of 0,3¸0,5 Tesla and some thousands of relative permeability. Therefore, ferrite materials have quite low saturation flux, that is the most critical limit for inductive components, especially in case of high DC currents or high overcurrent risk. Ferrite materials for power application have the great advantage of low losses level on a wide frequency range.


Amorphous and Nanocrystalline Laminated Cores

Amorphous and nanocrystalline laminations are obtained by a special rapid quenching technology. Typical thicknesses of those laminations are few tens of μm. Amorphous cores are suitable for output inductors, when high DC current, low ripple current, extremely compact dimensions. High saturation flux level is suitable for high currents and low ripple current doesn't cause critical core losses.

Nanocrystalline cores have vary low losses, even for high variation of magnetic flux, so they can be used for switching transformers too.

Sirio Inductors


Powder Cores

Powder cores differ in chemical composition. Powder cores are pressed with an organic or inorganic binder, that is responsible for storage of energy. Each material, identified by the producer with a code or a commercial name, possesses its own characteristics in terms of permeability, saturation flux, specific losses. They are typically very stable with the temperature and they can be used in critical environment applications. Powder cores are more expensive than ferrite cores, but normally cheaper than amorphous and nanocrystalline ones.


For further information on all Transformer and MU Metal Cores please call: 01444 243 452 or email your enquiry to: .(JavaScript must be enabled to view this email address).

GD Rectifiers Ltd

GD Rectifiers design and manufacture Selenium and Silicon Rectifiers, Suppressors, Converters, Inverters and Regulator Products for industrial power control applications.

They are the UK's leading Distributor of power electronic components and hold extensive stock of Diodes, Thyristors, IGBTs and MOSFETs from the world's leading semiconductor manufacturers.

Further information:

You can find further information on GD Rectifiers Ltd using the following links:

Tel: 01444 243 452

Fax: 01444 870 722

Email: enquiries@gdrectifiers.co.uk