| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum circuit breaker having both breaking performance and a low surge property. SOLUTION: A substance comprising Cr, either of Cu and Ag and a carbide and forming a structure where Cr with its circumference surrounded by the carbide is dispersed in a matrix formed of a carbide and containing either of Cu and Ag as a main constituent is used for an electric contact. Sufficient breaking performance can be provided by containing Cr and either of Cu and Ag; a chopping current can be reduced by a sublimation phenomenon of the carbide in current cutoff; arc drive is facilitated; and excellent breaking performance can be exerted. In addition, the carbide is present by surrounding the circumference of Cr, whereby current-carrying performance of the matrix containing either of Cu and Ag as a main constituent can be secured and a low surge property improving action can be exerted. COPYRIGHT: (C)2007,JPO&INPIT
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