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自恢(hui)(hui)(hui)復(fu)保險絲，英文PPTC（Polymer Positive Temperature Coefficient），由(you)高(gao)分(fen)子(zi)基(ji)(ji)體材(cai)(cai)料及導(dao)電(dian)(dian)微(wei)(wei)粒組成的，是(shi)壹種具有自動(dong)恢(hui)(hui)(hui)復(fu)功能(neng)的過流(liu)保護元器件。當有異(yi)常(chang)過電(dian)(dian)流(liu)通(tong)(tong)過PPTC時(shi)，產生的熱量使(shi)高(gao)分(fen)子(zi)基(ji)(ji)體材(cai)(cai)料膨(peng)脹，包裹在高(gao)分(fen)子(zi)基(ji)(ji) 體材(cai)(cai)料外(wai)的導(dao)電(dian)(dian)微(wei)(wei)粒會(hui)分(fen)開從而切斷PPTC的導(dao)電(dian)(dian)通(tong)(tong)道使(shi)PPTC電(dian)(dian)阻(zu)上(shang)升，從而減小異(yi)常(chang)過電(dian)(dian)流(liu)。當異(yi)常(chang)過電(dian)(dian)流(liu)故(gu)障清除後(hou)，PPTC高(gao)分(fen)子(zi)基(ji)(ji)體材(cai)(cai)料收縮(suo)至(zhi)原(yuan)來(lai)的形狀(zhuang)重(zhong)新(xin)將導(dao)電(dian)(dian)微(wei)(wei)粒聯(lian)結起(qi)來(lai)，導(dao)電(dian)(dian)通(tong)(tong)道會(hui)恢(hui)(hui)(hui)復(fu)，PPTC電(dian)(dian)阻(zu)又恢(hui)(hui)(hui)復(fu)到原(yuan)來(lai)的低阻(zu)狀(zhuang)態(tai)。上(shang)述過程(cheng)可循環(huan)多次。

自恢復(fu)保(bao)險絲(si)(si)最大(da)(da)的優勢就是在其額(e)定(ding)使(shi)用範圍內，每次故障排除後PPTC不需要(yao)更換，可反(fan)復(fu)多次應用於電(dian)(dian)(dian)路中，最大(da)(da)化有效節(jie)約維修(xiu)時間及成本。自恢復(fu)保(bao)險絲(si)(si)對電(dian)(dian)(dian)流、溫(wen)度比較敏感(gan)，廣泛應用於計算(suan)機、電(dian)(dian)(dian)子整流器、汽車、通信、家用電(dian)(dian)(dian)渠、電(dian)(dian)(dian)池及其他工業領域。