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.

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
45 36 3.0×1.0 76×24 1.2 0.5
65 52 3.2×1.0 80×26 1.4 0.6
90 72 3.4×1.1 86×28 1.7 0.8
115 92 3.7×1.2 93×30 2.2 1.0
175 140 3.9×1.3 99×32 2.7 1.2
220 176 4.2×1.4 105×34 3.2 1.5
275 220 4.5×1.4 113×36 3.8 1.7
320 256 4.6×1.5 116×38 4.2 1.9
425 340 4.9×1.6 124×41 5.2 2.4
550 440 5.2×1.7 131×43 6.1 2.8
650 520 5.4×1.8 138×45 6.8 3.1
800 640 5.7×1.9 144×49 8.5 3.9
1000 800 6.0×2.05 152×52 9.8 4.5
1300 1040 6.3×2.1 159×54 12.5 5.7
1600 1280 6.7×2.3 169×57 15.0 6.8
2000 1600 7.0×2.4 179×61 17.5 7.9

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