The numbers refer to the dimensions of the frame, i.e. 20 = 20 mm.
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The bar has a symbol BAR20/3/5.5 (or BAR20-3-5.5).
The relative winding width is longer than in most of other ferrite cores, which allows for the bobbin to have multiple sections. The manufacturer offers the multiple-chamber bobbin, but there is no indication of how all the parts should be held together (e.g. a clip).
|Σ(l/A)||core factor (C1)||3.29 mm-1|
|Ve||effective volume||655 mm|
|le||effective length||46 mm|
|Ae||effective area||14 mm2|
|Amin||minimum area||7.4 mm2|
|m||mass of frame||2.1 g|
|m||mass of bar||1.5 g|