Electromagnetic drive for an electrical switch, in particular an electrical circuit breaker, with - at least one movable armature, which can implement a lifting movement along a predetermined pushing direction, can be connected indirectly or directly to a movable switching contact of the switch, and, in a closed position, closes a magnetic circuit (M1, M2) of the drive at a first armature-side stop face with a first magnetically conductive yoke part of the drive and at a second armature-side stop face with a second magnetically conductive yoke part of the drive, - at least one permanent magnet (90, 95), which produces a magnetic field for the magnetic circuit (M1, M2) and a holding force for holding the armature in the closed position, and - at least one coil, which is arranged in such a way that a magnetic flux can be brought about by a current flow through the coil, which magnetic flux is directed in the same direction as or in opposition to the magnetic flux of the permanent magnet (90, 95) in the magnetic circuit (M1, M2), - wherein the electromagnetic drive provides the possibility of a readjustment state after installation by virtue of self-adjustment of the position of the first yoke part and the second yoke part relative to one another being possible as a result of the magnetic force of the permanent magnet (90, 95), and - wherein the yoke parts (100, 105) can be brought into a fixedly installed state, in which the alignment of the yoke parts (100, 105) is fixed independently of the further positioning of the armature, wherein - in the readjustment state, the magnetic circuit (M1, M2) is closed by the armature and at least two yoke parts (100, 105) of the drive can be displaced relative to one another along the pushing direction of the armature, so - driven by the magnetic force of the permanent magnet (90, 95) - the yoke-side stop face of the first yoke part is brought in a self-adjusting manner to a spacing from the yoke-side stop face of the second yoke part which is identical to the spacing between the first and the second armature-side stop face along the predetermined pushing direction, characterised in that - the at least two yoke parts (100, 105), which can be displaced relative to one another along the pushing direction of the armature, are screwed together, wherein one screw (210, 215) is led through a hole in one of the two yoke parts (100, 105) and is screwed to the other of the two yoke parts (100, 105), wherein the diameter (d) of the hole along the pushing direction of the armature is greater than the diameter (d) of the screw (210, 215), - wherein, with a loose screw connection and closed position of the armature, the yoke parts (100, 105) are in the readjustment state and - wherein, with a tight screw connection, the yoke parts (100, 105) are in a fixedly installed state. - at least one movable armature, which can implement a lifting movement along a predetermined pushing direction, can be connected indirectly or directly to a movable switching contact of the switch, and, in a closed position, closes a magnetic circuit (M1, M2) of the drive at a first armature-side stop face with a first magnetically conductive yoke part of the drive and at a second armature-side stop face with a second magnetically conductive yoke part of the drive, - at least one permanent magnet (90, 95), which produces a magnetic field for the magnetic circuit (M1, M2) and a holding force for holding the armature in the closed position, and - at least one coil, which is arranged in such a way that a magnetic flux can be brought about by a current flow through the coil, which magnetic flux is directed in the same direction as or in opposition to the magnetic flux of the permanent magnet (90, 95) in the magnetic circuit (M1, M2), - wherein the electromagnetic drive provides the possibility of a readjustment state after installation by virtue of self-adjustment of the position of the first yoke part and the second yoke part relative to one another being possible as a result of the magnetic force of the permanent magnet (90, 95), and - wherein the yoke parts (100, 105) can be brought into a fixedly installed state, in which the alignment of the yoke parts (100, 105) is fixed independently of the further positioning of the armature, wherein - in the readjustment state, the magnetic circuit (M1, M2) is closed by the armature and at least two yoke parts (100, 105) of the drive can be displaced relative to one another along the pushing direction of the armature, so - driven by the magnetic force of the permanent magnet (90, 95) - the yoke-side stop face of the first yoke part is brought in a self-adjusting manner to a spacing from the yoke-side stop face of the second yoke part which is identical to the spacing between the first and the second armature-side stop face along the predetermined pushing direction, characterised in that - the at least two yoke parts (100, 105), which can be displaced relative to one another along the pushing direction of the armature, are screwed together, wherein one screw (210, 215) is led through a hole in one of the two yoke parts (100, 105) and is screwed to the other of the two yoke parts (100, 105), wherein the diameter (d) of the hole along the pushing direction of the armature is greater than the diameter (d) of the screw (210, 215), - wherein, with a loose screw connection and closed position of the armature, the yoke parts (100, 105) are in the readjustment state and - wherein, with a tight screw connection, the yoke parts (100, 105) are in a fixedly installed state.