| 摘要 |
PROBLEM TO BE SOLVED: To prevent a disconnecting part from allocating the responsibility for current disconnection. SOLUTION: A commutation capacitor 8 is connected in parallel with a charging circuit 15 via a releasing switch 11, and the releasing switch 11 is opened at the time of a breaking action of a breaking part 6 and shut after the self extinction of arc of a commutation 9 switch itself.
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