Composite circuit protection devices

Electric heating – Heating devices – With power supply and voltage or current regulation or...

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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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