Composite circuit protection devices

Details Composite circuit protection devices Composite circuit protection devices

H - Electricity

05

B

306/110, 317/15

H05B 1/02 (2006.01)

Patent

CA 1333411

Circuit protection devices which comprise a PTC conduc- tive 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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