深圳市尧丰发科技有限公司

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。 自恢复保险丝参数 在自恢复保险丝选型过程中，主要涉及以下参数 1. 保持电流（Ih）：25℃静止空气环境中不触发电阻突越的电流。 2. 触发电流（It）：25℃静止空气环境中PTC聚合物自复保险丝从低阻转为高阻抗的电流。 3. 电压（Vmax）：PTC聚合物自复保险丝的工作电压。 4. 电流（Imax）：PTC聚合物自复保险丝能承受的电流。 5. 动作功率（Pdtyp.）：25℃环境温度时PTC聚合物自复保险丝动作状态下的消耗功率。 6. 动作时间（Ttrip）：5倍保持电流下动作时间。 

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