Magnetic contact operating device fed with signal - has yoke and cross piece made from same piece with armature spring

A magnetic device has a yoke with both limbs consisting of a magnetically conducting material. They are linked via a cross piece. There is an armature which operates in conjunction with the front contact surface of the yoke limb. The armature is made from magnetic material with a permanent magnet attached to this material. The limb of the yoke and the cross piece are made from the cross piece to form a continuous yoke section (7) made from a magnetically conducting material. The permanent magnet (8) is attached to the yoke section or armature (10) and has a component of insignificant rigidity. The armature can be lifted off the yoke section via biasing spring (11). There is an electrical coil (9) which induces a magnetic force of the opposite polarity to the permanent magnet into the yoke section.