FRM21/4/12

FRM 21/4/12 - 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 BAR22/2/6.

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.

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