The numbers refer to the dimensions of the frame in millimetres, so 24 = 24 mm, etc.
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The bar has a symbol BAR25/2.2/4 (or BAR25-2.2-4). The bar is marked with “25” because it is slightly longer (24.7 +/- 0.3 mm).
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||5.65 mm-1|
|Ve||effective volume||370 mm|
|le||effective length||45.8 mm|
|Ae||effective area||8.1 mm2|
|Amin||minimum area||6.0 mm2|
|m||mass of frame||1.3 g|
|m||mass of bar||1.2 g|