| 摘要 |
<p>An operation circuit (25) is set to a conductive state in a case where a three-phase alternating-current power supply switching circuit (100) receives an R phase and an N phase. An internal switch (21 b) is set to a non-conductive state in a case where the state of the operation circuit (25) is the conductive state. One contactor (20) electrically connects an input terminal (8bN) to output terminals (91, 92, 93) in a case where the state of the operation circuit (25) is the conductive state. Another contactor (10) electrically disconnects input terminals (8aR, 8aS, 8aT) from the output terminals (91, 92, 93) in a case where the state of the internal switch (21b) is the non-conductive state.</p> |
