PTC device
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United States of America Patent
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-
Sep 21, 1993
Grant Date -
N/A
app pub date -
Apr 23, 1991
filing date -
Apr 25, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A self-recovery PTC device for overcurrent protection of electrical circuits is made with a polymer/metal powder composition electrode that displays stable resistivity over a broad range of contact forces. Secure bonding of electrodes to a PTC element is achieved because both components are polymer composites, eliminating the problems associated with attempts to bond metal electrodes to a polymer PTC element. Swelling of metal electrodes, that results from outgassing by a PTC element, is also eliminated, because polymer electrodes are gas permeable.
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