Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1989-12-22
1991-11-12
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219510, 219494, 219209, 338 22R, H05B 702, H01C 710
Patent
active
050649973
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 voltate-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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Au Andrew N.S.
Carlomagno William D.
Fahey Timothy E.
Fang Shou-Mean
Horsma David A.
Burkard Herbert G.
Gerstner Marquerite E.
Paschall M. H.
Raychem Corporation
Richardson Timothy H. P.
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