Toroidal O-Core Power Transformers

Overview

Picture shows a regular toroidal and an O-core toroidal transformer with the same power rating.

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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Please refer to the chart below for the physical sizes of power ratings up to 2,000VA 60Hz, or 1600VA for 50/60Hz frequencies.

O-Core Transformers
Size and weight of different power ratings
Power
VA @ 60Hz
Power
VA @ 50/60Hz
         Dimensions *
OD x Height    OD x Height
(inches)             (mm)
Weight *
(Approx.)
Lbs          kg
45363.0×1.076×241.20.5
65523.2×1.080×261.40.6
90723.4×1.186×281.70.8
115923.7×1.293×302.21.0
1751403.9×1.399×322.71.2
2201764.2×1.4105×343.21.5
2752204.5×1.4113×363.81.7
3202564.6×1.5116×384.21.9
4253404.9×1.6124×415.22.4
5504405.2×1.7131×436.12.8
6505205.4×1.8138×456.83.1
8006405.7×1.9144×498.53.9
10008006.0×2.05152×529.84.5
130010406.3×2.1159×5412.55.7
160012806.7×2.3169×5715.06.8
200016007.0×2.4179×6117.57.9

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