FRM27/3.8/9

FRM 27/3.8/9 - a type of frame core made of soft ferrite, supplied by Ferroxcube.

The core comprises a cuboid bar, which slides into a bobbin. The outer frame of the core is assembled on top of the bobbin.

The bar has a symbol BAR28/2.3/3.8.

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).

In 2013 the core was offered in two materials: 3C90 and 3C91.