Patent ID: 8169294
Filing Date: 2012-05-01
Classification: H01C

Abstract:
1. An over-current protection device, comprising: two metal foils; and a positive temperature coefficient (PTC) material layer sandwiched between the two metal foils, exhibiting a volume resistivity below 0.1 Ω-cm, and comprising: a plurality of crystalline polymers, wherein at least one of the crystalline polymers exhibits a melting point below 115° C.; and an electrically conductive nickel filler having a particle size from 0.1 μm to 15 μm and a volume resistivity below 500 μΩ-cm; and a non-conductive metal nitride filler; wherein the electrically conductive nickel filler and the non-conductive metal nitride filler are dispersed in the crystalline polymers.