Contact for vacuum interrupter
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMasaru Kato, Hitoshi Takeuchi, Toshiaki Horiuchi
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Abstract
A contact for a vacuum interrupter has excellent characteristics of high withstand voltage, low melt bonding property, large current durability and low chopping current and is prepared by uniformly distributing, in a copper matrix, two kinds of high melting point metal powders having a melting point of higher than 1450.degree. C. which have different particle diameters of (1) 80-300 .mu.m and (2) less than 30 .mu.m. The low chopping current characteristic is imparted by incorporating more than 10 wt. % of the high melting point metal powder. The high melting point metal powder can be selected from the group consisting of Cr, W, Mo, Ir and Co.
Claims6
A contact for a vacuum circuit interrupter which is prepared by uniformly distributing, in a copper matrix, at least 10 wt.% of a high melting point metal powder having a melting point higher than 1450.degree. C. and selected from the group consisting of Cr, Fe, Co and mixtures thereof, wherein said powder is a mixture of two different particle sizes wherein one particle size has a diameter of (1) 80-300 .mu.m and the other particle size has a diameter of (2) less than 30 .mu.m.
Dependencies are inferred from the claim text.