Circuit protection devices

Details Circuit protection devices Circuit protection devices

H - Electricity

01

C

317/12.9

H01C 7/02 (2006.01)

Patent

CA 1175098

Abstract The invention relates to circuit protection devices which comprise a PTC conductive polymer element. The devices of the invention comprise two columnar electrodes and a conductive polymer element, at least a part of which is a PTC element, between the electrodes. The device also comprises at least one insulating element which lies within the conductive polymer element between the electrodes and produces an intermediate portion of increased resistance such that when a fault current passes through the device and converts it to the high temperature high resistance state, a hot zone forms in the PTC element at a location away from the electrodes.

375780

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