CUSTOM DESIGNS for 60Hz or 50/60Hz

O-Core power transformers are the preferred choice for applications when a lowest possible profile is a design priority.  O-Core transformers have a diameter to height ratio of around 3:1 compared to 2:1 for our regular toroidal transformers.

Since O-Cores have no sharp edges they require less insulation and can be wound with less fill factor resulting in a lighter and smaller transformer than a regular toroidal core transformer.

The grain oriented silicon steel properties of O-Cores are the same as in our regular toroidal cores giving the O-Core transformers the same electrical benefits. They can be used in designs for the same applications.

If your design requires a small footprint our regular toroidal core is a better choice as it offers flexible dimensions.

O-Cores are wound from a steel strip which is continuously pointed towards each end to produce a circular cross section. The circumference of a circle is about 12% less than that of a square with same area and 18% less than a rectangle with the same area and a diameter to height ratio of 2:1 as in the typical regular toroidal core transformer.
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