電(dian)(dian)(dian)阻(zu)加熱(re)方式(shi)電(dian)(dian)(dian)熱(re)帶是(shi)人(ren)們所熟知(zhi)的一種。電(dian)(dian)(dian)阻(zu)型(xing)(xing)加熱(re)的電(dian)(dian)(dian)阻(zu)（發熱(re)元件）有銅(tong)—鎳合金和鎳—鉻合金，可以(yi)制作成串聯(lian)電(dian)(dian)(dian)阻(zu)型(xing)(xing)電(dian)(dian)(dian)熱(re)電(dian)(dian)(dian)纜(lan)和并聯(lian)電(dian)(dian)(dian)阻(zu)型(xing)(xing)電(dian)(dian)(dian)熱(re)電(dian)(dian)(dian)纜(lan)，電(dian)(dian)(dian)阻(zu)型(xing)(xing)電(dian)(dian)(dian)熱(re)電(dian)(dian)(dian)纜(lan)材料(liao)選擇主要(yao)取決(jue)于所維(wei)持(chi)被(bei)伴熱(re)體溫度(du)。如高溫礦物材料(liao)絕(jue)緣電(dian)(dian)(dian)熱(re)電(dian)(dian)(dian)纜(lan)可維(wei)持(chi)溫度(du)達數百攝氏度(du)。

    隨著材料(liao)科學(xue)的(de)(de)發展(zhan)，電(dian)(dian)(dian)(dian)阻半(ban)(ban)導體材料(liao)也有(you)：用經(jing)過射(she)線(xian)處(chu)理(li)過的(de)(de)具(ju)有(you) PTC 性能(neng)的(de)(de)高分(fen)子(zi)半(ban)(ban)導體塑(su)料(liao)的(de)(de)電(dian)(dian)(dian)(dian)阻，這種半(ban)(ban)導體塑(su)料(liao)具(ju)有(you)特殊的(de)(de)分(fen)子(zi)記憶(yi)能(neng)力，它可(ke)以根據環(huan)境溫度(du)的(de)(de)變化，自動進行電(dian)(dian)(dian)(dian)流量的(de)(de)調節，因此而派生出一種新型(xing)(xing)的(de)(de)產品：自限溫電(dian)(dian)(dian)(dian)熱(re)帶，從此克(ke)服了原電(dian)(dian)(dian)(dian)阻型(xing)(xing)電(dian)(dian)(dian)(dian)熱(re)電(dian)(dian)(dian)(dian)纜的(de)(de)溫度(du)不(bu)能(neng)自行限制的(de)(de)不(bu)安(an)全隱患，使用也更為便捷。

    這種半導體PTC材料(liao)，在(zai)溫(wen)度上升時，受熱膨脹，使得部分電(dian)流(liu)通道網絡逐步斷開，通過(guo)的(de)電(dian)流(liu)減(jian)少，發(fa)熱量(liang)也(ye)隨之減(jian)少。當(dang)溫(wen)度上升到(dao)某個范圍時，半導體PTC材料(liao)中電(dian)流(liu)通道因受熱膨脹，幾(ji)乎都成斷路，電(dian)熱帶(dai)電(dian)源等于切斷，而(er)在(zai)溫(wen)度降低時，芯帶(dai)收縮，電(dian)流(liu)通道重新接通，電(dian)熱帶(dai)又開始供(gong)給(gei)熱量(liang)，這就(jiu)是自(zi)限溫(wen)伴熱帶(dai)實現自(zi)動調(diao)節溫(wen)度的(de)工作原理。