The numbers refer to dimensions of the frame, so 27 = 27 mm, etc.
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The bar has a symbol BAR28/2.3/3.8 (or BAR28-2.3-3.8). The bar is marked with “28” because it is slightly longer (28 +/- 0.5 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||5.56 mm-1|
|Ve||effective volume||504 mm|
|le||effective length||52.1 mm|
|Ae||effective area||9.7 mm2|
|Amin||minimum area||8.7 mm2|
|m||mass of frame||1.6 g|
|m||mass of bar||1.2 g|