自恢复保险丝原理
自恢复保险丝(以下简称保险丝)由聚合物树脂基体及分布在里面的导电粒子组成,在正常情况下,导电粒子在树脂基体中构成链状导电通路,保险丝表现为低阻抗(a)。电路中有过电流发生时,流经保险丝的大电流产生的热量使聚合物树脂基体体积膨胀,切断了导电粒子形成的链状导电通路,导致保险丝的阻抗迅速升高,从而起到对电路的过流保护作用(b)。故障排除后,树脂重新冷却结晶,体积收缩,导电粒子重新形成导电通路,保险丝恢复为低阻抗。
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