| 摘要 |
The invention relates to a switchgear (4) for a single-phase motor (16) and a three-phase motor (14), the switchgear (4) comprising a processing unit (6) and a first, second and third current path (1, 3), the first and third current path (1, 3) each comprising a current transformer (5), and the processing unit (6) being adapted to detect, by means of the current transformers (5), the current I1 of the first current path (1) and the current I3 of the third current path (3). In order to provide a cost-effective switchgear (4) for a one-phase motor (16) and a three-phase motor (14) which is adapted to identify the failure of every single phase (11, 12, 13) in the three-phase operation and a phase failure in the one-phase operation, the processing unit (6) is designed such as to detect the currents I1, I3 of the first and third current path (1, 3) and to determine, based on the phase shift between the detected currents I1, I3 of the first and third current path (1, 3) in which operating mode the switchgear (4) is operated. |
