| 摘要 |
PROBLEM TO BE SOLVED: To reliably prevent a diode from being damaged, despite of a simple constitution.SOLUTION: A backflow prevention device includes: a plurality of contact open/close sections allowing a contact to be opened/closed by magnetizing or demagnetizing an electromagnet block 40 having a coil 41 to drive; and a diode 29. The coil 41 and the diode 29 are connected in series, and each of the contact open/close sections and the diode 29 are connected in parallel. |
