什么是熔斷器？熔斷器有什么作用？
熔斷器是指當電流超過規定值時，以本身產生的熱量使熔體熔斷，斷開電路的一種保護器件。主要由熔體、外殼和支座3部分組成，其中熔體是控制熔斷特性的關鍵元件。熔體的材料、尺寸和形狀決定了熔斷特性。熔體材料分為低熔點和高熔點兩類。低熔點材料如鉛和鉛合金，其熔點低容易熔斷，由于其電阻率較大，故制成熔體的截面尺寸較大，熔斷時產生的金屬蒸氣較多，只適用于低分斷能力的熔斷器。
熔斷器的作用（西整熔斷器）
熔(rong)(rong)斷器(qi)的(de)作用是保(bao)護電(dian)(dian)流。熔(rong)(rong)斷器(qi)由熔(rong)(rong)體(ti)和(he)熔(rong)(rong)管(guan)構成，作為金(jin)屬導體(ti)串(chuan)聯在電(dian)(dian)路中(zhong)，當電(dian)(dian)流超過(guo)一(yi)定數值時，熔(rong)(rong)斷器(qi)會產生熱量使(shi)其熔(rong)(rong)體(ti)熔(rong)(rong)化，從(cong)而斷開電(dian)(dian)流，達到(dao)保(bao)護的(de)效果。熔(rong)(rong)斷器(qi)以(yi)其構造簡單、使(shi)用便捷的(de)特性，被廣泛(fan)應用于(yu)各種電(dian)(dian)工及電(dian)(dian)器(qi)設備中(zhong)。
熔斷器擴展資料（西整熔(rong)斷器）
熔體的材料、尺寸和形狀決定了熔斷特性。熔體材料分為低熔點和高熔點兩類。低熔點材料如鉛和鉛合金，其熔點低容易熔斷，由于其電阻率較大，故制成熔體的截面尺寸較大，熔斷時產生的金屬蒸氣較多，只適用于低分斷能力的熔斷器。高(gao)熔(rong)(rong)(rong)(rong)點材料如(ru)銅、銀(yin)，其熔(rong)(rong)(rong)(rong)點高(gao)，不(bu)容易熔(rong)(rong)(rong)(rong)斷(duan)，但由于其電阻率較低，可制成比(bi)低熔(rong)(rong)(rong)(rong)點熔(rong)(rong)(rong)(rong)體(ti)較小(xiao)的(de)(de)截(jie)面(mian)尺寸，熔(rong)(rong)(rong)(rong)斷(duan)時產生的(de)(de)金屬蒸氣少，適用(yong)于高(gao)分(fen)斷(duan)能(neng)力的(de)(de)熔(rong)(rong)(rong)(rong)斷(duan)器。熔(rong)(rong)(rong)(rong)體(ti)的(de)(de)形(xing)狀(zhuang)(zhuang)分(fen)為絲狀(zhuang)(zhuang)和(he)帶狀(zhuang)(zhuang)兩種(zhong)。改變變截(jie)面(mian)的(de)(de)形(xing)狀(zhuang)(zhuang)可顯(xian)著改變熔(rong)(rong)(rong)(rong)斷(duan)器的(de)(de)熔(rong)(rong)(rong)(rong)斷(duan)特(te)性。熔(rong)(rong)(rong)(rong)斷(duan)器有(you)各(ge)種(zhong)不(bu)同(tong)的(de)(de)熔(rong)(rong)(rong)(rong)斷(duan)特(te)性曲線，可以適用(yong)于不(bu)同(tong)類型保護(hu)對象(xiang)的(de)(de)需要(yao)。
