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US 4,784,829 AGranted
Contact material for vacuum circuit breaker
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMitsuhiro Okumura, Eizo Naya
Life of this patent
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Abstract
A contact material for a vacuum circuit breaker of excellent current breaking property and voltage withstand capability can be made from an alloy composed of copper and boride of tantalum, or an alloy composed of copper, boride of tantalum and titanium, or an alloy composed of copper, chromium, and boride of tantalum.
Claims4
A contact material for a vacuum circuit breaker which consists essentially of copper, chromium, and a boride of tantalum, wherein the content of said boride of tantalum is 10% by weight or less.
Dependencies are inferred from the claim text.