This part is a kind of semiconductor called EER29.

Function of this product has EER Cores.

Manufacturers : Yuxiang

Image and pinout :

Some of the text within the PDF file :

EER42,ETD-core,EER-core,EER40,EER20,EER35,EER cores,EER28,EER30,EER34,EER43,EER45,EER50,ETD cores, HOME PRODUCTS PROFILE CONTACT SITEMAP CATALOG p EER CORES ETD CORES Description of the “E” patterns The "E" patterns are sought that are easy to assemble, could be interleave to minimize gap effects, and would minimize waste. Since “E” cores have two open coil sides, they provide substantial room to bring high current lead wires out from the coil. It is easier to achieve high voltage electrical isolation with an “E” core. In the typical “E” lamination, the center leg (one of three legs) is twice the width of either outer leg. In theory, magnetic flux flowing out of the center leg divides equally and flows into the outer two "E" core legs. Since th [ ... ]

EER29 PDF Datasheet Download