| 摘要 |
PURPOSE:To prevent a load current from being cut off unnecessarily when reclosing operation is conducted electromagnetically by providing additionally a slow-releasing relay so as to eliminate a fault display generated unnecessarily when the power cut-off operation is conducted. CONSTITUTION:The slow-releasing relay D activated when an alarm contact al3 is closed and released slowly when the contact is opened is provided additionally. A break contact (d) of the relay D is inserted in series with a break contact br3. Further, a break contact of3 of a relay OF for disconnecting power supply is inserted in series with a fault display circuit AL. Through the constitution above, the fault display generated unnecessary in operating a power cut- off switch SW is eliminated. Moreover, the cut-off of the load current I1 caused unnecessarily when an electromagnetic switch NFB is reclosed is prevented. |
