Electromagnetic retention magnet, in particular for a retention relay, with a permanent magnet whose magnetic flux is closed, at rest, on the one hand, through a magnetic branch and, on the other hand, through a magnet armature, and in which, by means of a firing coil, the flux through the armature of the magnet is neutralized by opposite excitation or is shifted towards the magnetic shunt, essentially characterized in that the cylindrical core of magnetic conductive material has a cross section in the shape of t, with a part of smaller diameter and a part of greater diameter, of which the. The second one acts as a bypass and is fixed in a surrounding sleeve of magnetic conductive material, while in the part of smaller diameter there is, on one side of the frame, the firing coil and the permanent magnet, the armature of the magnet being in the part of the terminal surface of the cylindrical shell and of the part with the smallest diameter of the core. (Machine-translation by Google Translate, not legally binding)
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