Over-current protection device
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United States of America Patent
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Aug 30, 2016
Grant Date -
Aug 11, 2016
app pub date -
Feb 11, 2015
filing date -
Aug 5, 2014
priority date (Note) -
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Abstract
An over-current protection device includes two metal foils and a PTC material layer laminated therebetween. The PTC material layer has a volumetric resistivity between about 0.07 Ω-cm and 0.45 Ω-cm. The PTC material layer comprises a crystalline polymer and first and second conductive fillers dispersed therein. The first conductive filler is carbon black powder. The second conductive filler is selected from the group consisting of metal powder and conductive ceramic powder and has a volumetric resistivity less than 0.1 Ω-cm. The weight ratio of the second conductive filler to the first conductive filler is less than 4. The resistance jump R300/Ri of the over-current protection device is in the range from 1.5 to 5, where Ri is an initial resistance and R300 is a resistance after tripping 300 times.
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