Patent US4627786A successfully refreshed from Google Patents.
EP0083245A2
Expired / Lapsed
EP
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A sintered contact material for a vacuum circuit breaker
Assignee: Mitsubishi Electric Corp
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Filing: 1982-12-30
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Granted: —
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Expires: 2002-12-30
Abstract
Abstract A contact for a vacuum circuit breaker contains copper and also at least two elements of the group of chromium, molybdenum, and tungsten, each of these other elements in an amount not greater than 40% by weight. Up to 20% of low melting-point metal e.g. Bi may be added. Such alloys have a uniform fine-grained structure, leading to improved breakdown voltage and large current characteristics.
Inventors
- 👤 Eizo Naya
- 👤 Toshiaki Horiuchi
- 👤 Yasushi Takeya
- 👤 Kouichi Inagaki
- 👤 Michinosuke Demizu
- 👤 Mitsuhiro Okumura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 14:57
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; H01H1/0206
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A contact for a vacuum circuit breaker comprising copper as a first component and at least one further metal characterized in that two or more elements of the group of chromium, molybdenum, and tungsten are present as the further metal components, and that each of said further components is present in an amount less than or equal to 40% by weight.
Claim 2
Dependent Claim
61 words
A contact for a vacuum circuit breaker comprising copper as a first component and at least one further metal characterized in that two or more elements of the group of chromium, molybdenum, and tungsten are present as the further metal components, and that each of said further components is present in an amount less than or equal to 40% by weight.
Claim 3
Dependent Claim
44 words
A contact for a vacuum circuit breaker according to Claim 1, wherein said further components are chromium and tungsten, chromium being present in an amount of 10 to 40% by weight, and tungsten being present in an amount of 0.3 to 15% by weight.
Claim 4
Dependent Claim
55 words
A contact for a vacuum circuit breaker according to Claim 1 or 2, characterized in that it further contains at least one element having a low melting-point of the group of bismuth, tellurium, antimony, thallium, and zinc, and alloys and intermetallic compounds of these low-melting metals, in an amount not greater than 20% by weight.
References Cited (Backward Citations)
No citation records indexed.
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