Circuit protection devices comprising ptc elements

Details Circuit protection devices comprising ptc elements Circuit protection devices comprising ptc elements

H - Electricity

01

C

328/199

H01C 7/02 (2006.01) G05F 1/44 (2006.01) H03K 17/14 (2006.01)

Patent

CA 1143802

ABSTRACT The invention relates to circuit protection devices com- prising PTC elements, and circuits containing such devices. The devices protect the circuit against excessive current, and/or exces- sive temperature, which greatly increase the resistance of the device, so that the power in the circuit is very sharply reduced. The PTC element is composed of a material, preferably a conductive polymer, having a normal resistivity less than 10 ohm. cm. and the ; device has a normal resistance less than 1 ohm. The device com- : prises electrodes such that current flows through the PTC element over an area of equivalent diameter d with an average path length . t such that d/t is at least 2.

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