深圳市堯豐發(fā)科技有限公司

自恢復(fù)保險絲原理 自恢復(fù)保險絲(以下簡稱保險絲)由聚合物樹脂基體及分布在里面的導(dǎo)電粒子組成，在正常情況下，導(dǎo)電粒子在樹脂基體中構(gòu)成鏈狀導(dǎo)電通路，保險絲表現(xiàn)為低阻抗（a）。電路中有過電流發(fā)生時，流經(jīng)保險絲的大電流產(chǎn)生的熱量使聚合物樹脂基體體積膨脹，切斷了導(dǎo)電粒子形成的鏈狀導(dǎo)電通路，導(dǎo)致保險絲的阻抗迅速升高，從而起到對電路的過流保護(hù)作用（b）。故障排除后，樹脂重新冷卻結(jié)晶，體積收縮，導(dǎo)電粒子重新形成導(dǎo)電通路，保險絲恢復(fù)為低阻抗。 自恢復(fù)保險絲參數(shù) 在自恢復(fù)保險絲選型過程中，主要涉及以下參數(shù) 1. 保持電流（Ih）：25℃靜止空氣環(huán)境中不觸發(fā)電阻突越的最高電流。 2. 觸發(fā)電流（It）：25℃靜止空氣環(huán)境中PTC聚合物自復(fù)保險絲從低阻轉(zhuǎn)為高阻抗的最小電流。 3. 最大電壓（Vmax）：PTC聚合物自復(fù)保險絲的最大工作電壓。 4. 最大電流（Imax）：PTC聚合物自復(fù)保險絲能承受的最大電流。 5. 動作功率（Pdtyp.）：25℃環(huán)境溫度時PTC聚合物自復(fù)保險絲動作狀態(tài)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。 1. SMD0805P010TF SMD0805P020TF SMD0805P035TF SMD0805P050TF SMD0805P075TF SMD0805P100TF SMD1206P012TF SMD1206P016TF SMD1206P020TF/24 SMD1206P025TF SMD1206P035TF/16 SMD1206P050TF SMD1206P050TF/15 SMD1206P075TF SMD1206P075TF/13.2 SMD1206P100TF SMD1206P110TF SMD1206P150TF SMD1026P200TF SMD1210P005TF SMD1210P010TF SMD1210P020TF SMD1210P035TF SMD1210P050TF SMD1210P075TF SMD1210P110TF SMD1210P150TF SMD1812P010TF SMD1812P014TF SMD1812P020TF SMD1812P050TF SMD1812P075TF SMD1812P075TF/24 SMD1812P075TF/33 SMD1812P110TF SMD1812P110TF/16 SMD1812P110TF/24 SMD1812P110TF/33 SMD1812P125TF/16 SMD1812P125TF/6,4L SMD1812P150TF/8 SMD1812P150TF/12 SMD1812P150TF/24 SMD1812P160TF/8(4L) SMD1812P200TF SMD1812P260TF SMD1812P300TF SMD2016P030TF SMD2016P050TF SMD2016P100TF SMD2016P100TF/33 SMD2016P150TF SMD2016P200TF SMD2920P030TF SMD2920P050TF SMD2920P075TF SMD2920P100TF SMD2920P125TF SMD2920P150TF SMD2920P185TF SMD2920P200TF SMD2920P200TF/24 SMD2920P250TF SMD2920P260TF SMD2920P300TF SMD2920P300TF/15 專業(yè)生產(chǎn)和銷售：ESD靜電阻抗器，貼片壓敏電阻，壓敏電阻，熱敏電阻，瞬態(tài)抑制二極管，整流二極管，陶瓷放電管，玻璃放電管，半導(dǎo)體放電管，自恢復(fù)保險絲，ESD靜電二極管。