| 摘要 |
An electromagnetic drive unit (415) comprises a yoke (153), a coil (152) around said yoke (153), and a movable armature (151). Said coil (152) and said yoke (153) are at least partly surrounded by a magnetic layer (400). An electromechanical switching device (40) comprises a housing (18); at least one input terminal (11) and a responsive output terminal (12) for connecting the electromechanical switching device (40) to at least one current phase; and at least one electromagnetic drive unit (415) according to the first aspect of the invention. The coil (152) is adapted to receive a current responsive to the current of the responsive current phase (Æ1, Æ2, Æ3), and the movable armature (151) is adapted to break or limit at least the responsive current phase (Æ1, Æ2, Æ3) if the responsive current phase (Æ1, Æ2, Æ3) carries an excessive current.
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