插件式过电流保护元件;Radial-leaded over-current protection device

摘要

一种插件式过电流保护元件包含PTC元件、第一电极接脚、第二电极接脚和绝缘包覆层。PTC元件包含第一导电层、第二导电层及叠设于第一和第二导电层间的PTC材料层。PTC材料层的体积电阻率小于0.18Ω-cm，该PTC材料层包含结晶性高分子聚合物及均匀散布于其中之导电陶瓷填料，该导电陶瓷填料的体积电阻率小于500mΩ-cm，且占该PTC材料层之体积百分比在35-65%之间。第一电极接脚一端连接该第一导电层，第二电极接脚一端连接该第二导电层。绝缘包覆层包覆该PTC元件以及第一和第二电极接脚连接该PTC元件的一端。插件式过电流保护元件在25℃之维持电流除以PTC元件面积在0.027~0.3A/mm 2 之间。各该第一和第二电极接脚的截面积至少为0.16mm 2 。 A radial-leaded over-current protection device comprises a PTC device, a first electrode lead, a second electrode lead and an insulating encapsulation. The PTC device comprises a first conductive layer, a second conductive layer and a PTC material layer laminated therebetween. The PTC material layer has a resistivity less than 0.18Ω-cm and comprises crystalline polymer and conductive ceramic filler dispersed therein. The conductive ceramic filler has a resistivity less than 500mΩ-cm and comprises 35-65% by volume of the PTC material layer. The first electrode lead has an end connecting to the first conductive layer, whereas the second electrode lead has an end connecting to the second conductive layer. The insulating encapsulation wraps the PTC device and the ends of the first and second conductive layer connecting to the PTC device. The radial-leaded over-current protection device at 25℃