深圳市堯豐發(fā)科技有限公司
:何小易
:
: :hexiaoyi2010
熱自恢復保險絲原理
自恢復保險絲(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(xiàn)為低阻抗(a)。電路中有過電流發(fā)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。
自恢復保險絲參數
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(huán)境中不觸發(fā)電阻突越的zui高電流。
2. 觸發(fā)電流(It):25℃靜止空氣環(huán)境中PTC聚合物自復保險絲從低阻轉為高阻抗的zui小電流。
3. zui大電壓(Vmax):PTC聚合物自復保險絲的zui大工作電壓。
4. zui大電流(Imax):PTC聚合物自復保險絲能承受的zui大電流。
5. 動作功率(Pdtyp.):25℃環(huán)境溫度時PTC聚合物自復保險絲動作狀態(tài)下的消耗功率。
6. 動作時間(Ttrip):5倍保持電流下zui大動作時間。
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,半導體放電管,自恢復保險絲,ESD靜電二極管。