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 conventional toroid transformer.
The grain oriented silicon steel properties of O-Cores are the same as in our conventional 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 narrow footprint our conventional toroidal core is a better choice. Please contact us regarding the flexible dimensions of our conventional toroidal core designs.
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 height to width ratio of 2:1 as in the most popular conventional toroidal transformer.
Please refer to the chart below for the physical sizes of power ratings up to 2,000VA 60Hz
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