型号: | SMD1206P075TF |
---|---|
品牌: | 聚鼎 |
原产地: | 台湾 中国 |
类别: | 电子、电力 / 其它电力、电子 |
标签︰ | 自恢复保险 , 可恢复保险丝 , 热敏电阻 |
单价: |
¥0.1
/ 件
|
最少订量: | 4000 件 |
最后上线︰2017/05/17 |
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。自恢复保险丝原理
自恢复保险丝参数
D2920P250TF 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最高电流。
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最小电流。
3. 最大电压(Vmax):PTC聚合物自复保险丝的最大工作电压。
4. 最大电流(Imax):PTC聚合物自复保险丝能承受的最大电流。
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倍保持电流下最大动作时间。
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