Patent ID: 8937525
Filing Date: 2015-01-20
Classification: H01C

Abstract:
1. A surface-mountable over-current protection device being a substantially rectangular cuboid having upper and lower surfaces, a first lateral surface, a second lateral surface, a first end surface and a second end surface, the first and second lateral surfaces and the first and second end surfaces interconnecting the upper and lower surfaces; the over-current protection device comprising: a PTC device comprising a PTC material layer, a first conductive layer and a second conductive layer, the PTC material layer being disposed between the first and second conductive layers, and comprising crystalline polymer and conductive filler dispersed therein; a first electrode comprising a pair of first metal foils formed at the upper and lower surfaces; a second electrode comprising a pair of second metal foils formed at the upper and lower surfaces; a first circuit electrically connecting the first electrode and the first conductive layer and comprising a first planar line extending horizontally and a first conductive connecting member extending vertically; and a second circuit electrically connecting the second electrode and the second conductive layer and comprising a second planar line extending horizontally and a second conductive connecting member extending vertically; wherein at least one of the first planar line and the second planar line has a thermal resistance sufficient to mitigate heat dissipation, thereby the over-current protection device undergoes a test at 25° C. and 8 amperes can trip within 60 seconds.