| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a three-phase common enclosed circuit breaker capable of restraining exciting inrush current in a circuit breaker operation mechanism of a simple structure. Ž<P>SOLUTION: The circuit breaker operation mechanism of the three-phase common enclosed circuit breaker 10 is provided with a breaker operation part 11 functioning as a main contact breaking/inputting means for breaking a third main contact of a three-phase transmission line earlier by 1/4 cycle than a first and a second main contacts of the three-phase transmission line, and at the same time, inputting the first and the second main contacts earlier by 1/4 cycle than the third main contact, a coupling shaft 12, a first to a third cam plates 13<SB>1</SB>to 13<SB>3</SB>, a first to a third cam rollers 13b<SB>1</SB>to 13b<SB>3</SB>, a first to a third guide rollers 13c<SB>1</SB>to 13c<SB>3</SB>, a first to a third coupling tools 14<SB>1</SB>to 14<SB>3</SB>, and an operation control part 15. A first to a third grooves 13a<SB>1</SB>to 13a<SB>3</SB>are formed at the first to the third cam plates 13<SB>1</SB>to 13<SB>3</SB>, respectively. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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