貼片自恢復(fù)保險(xiǎn)絲PTC
自恢復(fù)保險(xiǎn)絲(以下簡稱保險(xiǎn)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(xiǎn)絲表現(xiàn)為低阻（a）。電路中有過電流發(fā)生時，流經(jīng)保險(xiǎn)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(xiǎn)絲的阻升高，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(xiǎn)絲恢復(fù)為低阻。
自恢復(fù)保險(xiǎn)絲參數(shù)
在自恢復(fù)保險(xiǎn)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(xiǎn)絲從低阻轉(zhuǎn)為高阻的小電流。
3.電壓（Vmax）：PTC聚合物自復(fù)保險(xiǎn)絲的工作電壓。
4.電流（Imax）：PTC聚合物自復(fù)保險(xiǎn)絲能承受的電流。
5.動作功率（Pdt.）：25℃環(huán)境溫度時PTC聚合物自復(fù)保險(xiǎn)絲動作狀態(tài)下的消耗功率。
6.動作時間（Ttrip）：5倍保持電流下動作時間。
貼片自恢復(fù)保險(xiǎn)絲PTC
Model Number: SMD1206，1812，0805，2920
Key Specifications/Special Features:
1812封裝：0.1~3.5A/6V~33V
1206封裝：0.05A~2A/6V~60V
0805封裝：0.1A~1.1A/6V~15V
1210封裝：0.05A~1.5A/6V~30V
2920封裝：0.3A~3A/6V~60V
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