| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance the withstand voltage characteristics and the interruption characteristics by improving the magnetic field distribution between contacts. <P>SOLUTION: In a vacuum valve having a pair of make/break contacts 6, the contact 6 comprises an electrode 10 fixed to the end of an energization shaft 7 and generating a magnetic field, an electrode plate 11 attached to the electrode 10, a first contact member 12 attached to the central part of the electrode plate 11 and made of an alloy improving the withstand voltage characteristics, a second contact member 13 attached to the circumference of the first contact member 12 and made of an alloy improving the interruption characteristics, and a magnetic body 14 provided between the electrode 10 and the electrode plate 11 and improving the magnetic field strength. The electrode plate 11 has a conductivity higher than those of the first contact member 12 and second contact member 13 so that temperature rise can be limited, and the magnetic body 14 is provided with a plurality of slits in the circumferential direction in order to limit generation of eddy current. <P>COPYRIGHT: (C)2012,JPO&INPIT |
