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US 7,679,021 B2Granted
Switching device
AssigneeSiemens Aktiengesellschaft
InventorsJoachim Gericke, Volker Lehmann, Andrzej Nowakowski, Klaus Schuler
Life of this patent
Estimating the term…
Abstract
An electrical switching device, especially a high-voltage circuit breaker, contains arcing contacts and nominal current contacts. At least one of the nominal current contacts has a surface formed of an arc-resistant material provided with a galvanic coating. In this configuration, the contact points can withstand high mechanical and thermal loads and at the same time maintain a high current carrying capacity.
Claims8
A switching device, comprising:
- a first and a second arcing contact piece, lying axially opposite one another;
- a first and a second rated current contact piece, disposed coaxially with respect to said arcing contact pieces, at least one of said rated current contact pieces having a hollow-cylindrical basic body formed with a substantially continuous outer circumferential wall having a front end;
- an arc-resistant material covering said front end, said arc-resistant material having an electroplated surface;
- and
- contact-making points disposed between said first and second rated current contact pieces and lying axially in a region of said electroplated surface in a switched-on state of the switching device;
- said electroplated surface making initial contact with said contact-making points and making contact with said contact-making points in the switched-on state of the switching device and
- wherein said arc-resistant material is made of a plurality of different metals, and said arc-resistant material is fixed to said hollow-cylindrical basic body in a form of a ring so as to cover said front end of said circumferential wall of said hollow-cylindrical basic body, wherein said ring has a smaller radial wall thickness at a further end facing away from said switching path than at an end facing said switching path.
4 more elements
A switching device, comprising:
- a first and a second arcing contact piece, lying axially opposite one another;
- a first and a second rated current contact piece, disposed coaxially with respect to said arcing contact pieces, at least one of said rated current contact pieces having a hollow-cylindrical basic body formed with a substantially continuous outer circumferential wall having a front end;
- an arc-resistant material covering said front end, said arc-resistant material having an electroplated surface;
- contact-making points disposed between said first and second rated current contact pieces and lying axially in a region of said electroplated surface in a switched-on state of the switching device;
- and
- a ring attached to said front end of said circumferential wall of said hollow-cylindrical basic body;
- said ring made of said arc-resistant material;
- said electroplated surface making initial contact with said contact-making points and making contact with said contact-making points in the switched-on state of the switching device and
- wherein said arc-resistant material is made of a plurality of different metals.
6 more elements
Dependencies are inferred from the claim text.