CPC H01C 7/021 (2013.01) [H01C 1/1406 (2013.01); H01C 7/028 (2013.01); H02H 9/026 (2013.01)] | 12 Claims |
1. A radial-leaded over-current protection device, comprising:
a PTC element comprising comprises a first conductive layer, a second conductive layer and a PTC material layer laminated therebetween;
a first electrode lead having an end connecting to the first conductive layer;
a second electrode lead having an end connecting to the second conductive layer; and an electrically insulating encapsulation layer, wherein the electrically insulating encapsulation layer comprises a fluorine-containing polymer, and wraps around an entire outer surface of the PTC element and the ends of the first and second electrodes connecting to the PTC element;
wherein the electrically insulating encapsulation layer has a thickness of 102˜105 nm;
wherein the radial-leaded over-current protection device has an initial resistance Rbf of 0.0017˜0.0027Ω; and
wherein after being put in a high temperature and high humidity environment for 336 hours, the radial-leaded over-current protection device has a resistance recovery R % of 1.07-1.21, and an endurable current per unit area of the device of 0.85-1.10 A/mm2.
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