Device for detecting contact wear in switching appliances
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United States of America Patent
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Aug 5, 2008
Grant Date -
Jan 4, 2007
app pub date -
Sep 17, 2004
filing date -
Sep 29, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A device for detecting wear of switching contacts in an electric switch appliance is disclosed, the wear of the contacts being caused at least at a pair of switching contacts appliance. The device includes a lightwave guide and a detector. A light exiting from at least one light source is capable of being injected into the lightwave guide and guided by the lightwave guide up to the detector. The lightwave guide is arranged relative to the pair(s) of switching contacts, such that the intensity of the light injected in the lightwave guide, which is measured by the detector, decreases in the switching appliance as the number of wear particles of contacts generated by the wear of the contacts increases.
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