型號: | SMD1812P110TF |
---|---|
品牌: | 聚鼎 |
原產地: | 臺灣 中國 |
類別: | 電子、電力 / 其它電力、電子 |
標籤︰ | 自恢復保險 , 保險絲 , 可恢復保險絲 |
單價: |
-
|
最少訂量: | 2000 件 |
最後上線︰2017/05/17 |
保險絲(以下簡稱保險絲)由聚合物樹脂基體及分布在裡面的導電粒子組成,在正常情況下,導電粒子在樹脂基體中構成鏈狀導電通路,保險絲表現為低阻抗(a)。電路中有過電流發生時,流經保險絲的大電流產生的熱量使聚合物樹脂基體體積膨脹,切斷了導電粒子形成的鏈狀導電通路,導致保險絲的阻抗迅速升高,從而起到對電路的過流保護作用(b)。故障排除后,樹脂重新冷卻結晶,體積收縮,導電粒子重新形成導電通路,保險絲恢復為低阻抗。自恢復保險絲原理
自恢復保險絲參數
D2920P250TF 在自恢復保險絲選型過程中,主要涉及以下參數
1. 保持電流(Ih):25℃靜止空氣環境中不觸發電阻突越的最高電流。
2. 觸發電流(It):25℃靜止空氣環境中PTC聚合物自復保險絲從低阻轉為高阻抗的最小電流。
3. 最大電壓(Vmax):PTC聚合物自復保險絲的最大工作電壓。
4. 最大電流(Imax):PTC聚合物自復保險絲能承受的最大電流。
5. 動作功率(Pdtyp.):25℃環境溫度時PTC聚合物自復保險絲動作狀態下的消耗功率。
6. 動作時間(Ttrip):5倍保持電流下最大動作時間。
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