Composite circuit protection devices
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United States of America Patent
Stats
-
Sep 15, 1992
Issued Date -
N/A
app pub date -
Dec 22, 1989
filing date -
Jul 10, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Circuit protection devices which comprise a PTC conductive polymer element and a second electrical component which is thermally coupled to the PTC element and which, when a fault causes the current in the circuit to become excessive, generates heat which is transferred to the PTC element, thus reducing the time taken to 'trip' the PTC element. The second component is for example a voltage-dependent resistor which is connected in series with the PTC element under the fault conditions and is thus protected from damage. Alternatively, the second component is a thick film resistor which is connected in series with the PTC element.
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