Iskra d. d.


Iskra is one of the major Slovenian producers of different types of wounded transformer cores made from oriented silicon steel. With own production line and highly trained personnel we fulfill requirements of customers.










To produce high-quality cores for transformers and chokes we use electrical silicon steel sheet, in which is the 3% of silicon. For our clients we produce mainly cores of M0 and M4 thicknesses. Sheet metal, thickness 0.3 mm and 0.27 mm can be used up to 200 Hz, metal sheet 0.1 mm, can be used in a range from 200 Hz to 2 kHz.

Additional services

We offer our customers also insulated cores, while the C cores and other cores can be supplied with different length of the clamps.









Development of cores

Our engineers will use their knowledge and their experience for professional advice you need for the planning and selection of cores to meet your requirements.

Types of cores:

  • Toroidal cores
  • CU cores
  • U cores
  • Rectangular cores of any dimension