浪涌保護(hu)(hu)器(qi)實(shi)際就是壓(ya)敏電(dian)(dian)(dian)阻，具有(you)高(gao)通(tong)低阻的特性。當電(dian)(dian)(dian)網(wang)在(zai)不(bu)超過(guo)最大(da)持續運(yun)行(xing)電(dian)(dian)(dian)壓(ya)的情況下運(yun)行(xing)時(shi)(shi)(shi)，兩個電(dian)(dian)(dian)極之間(jian)呈高(gao)阻狀(zhuang)(zhuang)態(tai)。如(ru)果電(dian)(dian)(dian)網(wang)因(yin)雷擊(ji)或者(zhe)操作過(guo)電(dian)(dian)(dian)壓(ya)使兩個電(dian)(dian)(dian)極之間(jian)的電(dian)(dian)(dian)壓(ya)超過(guo)點火電(dian)(dian)(dian)壓(ya)時(shi)(shi)(shi)，間(jian)隙(xi)被(bei)擊(ji)穿(chuan)，通(tong)過(guo)弧光放電(dian)(dian)(dian)將過(guo)電(dian)(dian)(dian)壓(ya)能(neng)量(liang)釋(shi)放。沖擊(ji)波過(guo)后，電(dian)(dian)(dian)弧將被(bei)由分(fen)弧片和滅(mie)弧室組(zu)成的滅(mie)弧系統熄滅(mie)，恢(hui)復到高(gao)阻狀(zhuang)(zhuang)態(tai)用(yong)以保護(hu)(hu)系統。浪涌保護(hu)(hu)器(qi)本身如(ru)果出現(xian)故障，會出現(xian)長時(shi)(shi)(shi)間(jian)接(jie)通(tong)狀(zhuang)(zhuang)態(tai)，造成電(dian)(dian)(dian)源/系統短路，此時(shi)(shi)(shi)就需要前端的及時(shi)切斷(duan)(duan)接地回路(lu)，保(bao)(bao)證回路(lu)正常工作(zuo)。（熔(rong)(rong)(rong)斷(duan)(duan)器(qi)(qi)的作(zuo)用）那(nei)么(me)此(ci)斷(duan)(duan)路(lu)器(qi)(qi)或(huo)熔(rong)(rong)(rong)斷(duan)(duan)器(qi)(qi)怎樣辨(bian)別(bie)到底是(shi)(shi)(shi)雷(lei)擊造成(cheng)(cheng)(cheng)短路(lu)的（稱(cheng)為A）還是(shi)(shi)(shi)浪涌保(bao)(bao)護器(qi)(qi)自身損壞(huai)(稱(cheng)為B)造成(cheng)(cheng)(cheng)的短路(lu)，因(yin)為如果(guo)是(shi)(shi)(shi)A被(bei)辨(bian)別(bie)成(cheng)(cheng)(cheng)B，斷(duan)(duan)路(lu)器(qi)(qi)斷(duan)(duan)開(kai)(kai)，主(zhu)電(dian)(dian)(dian)路(lu)就(jiu)會燒(shao)毀(hui)，反之如果(guo)B被(bei)辨(bian)別(bie)成(cheng)(cheng)(cheng)A，主(zhu)電(dian)(dian)(dian)路(lu)就(jiu)會持(chi)續短路(lu)也(ye)會導致燒(shao)毀(hui)電(dian)(dian)(dian)路(lu)。 你(ni)(ni)的所(suo)有(you)問(wen)題歸納起來只要(yao)你(ni)(ni)搞懂(dong)了(le)(le)(le)在防(fang)雷(lei)器(qi)(qi)前段(duan)加(jia)裝熔(rong)(rong)(rong)斷(duan)(duan)器(qi)(qi)的原理就(jiu)能明白了(le)(le)(le)。 我們(men)用的防(fang)雷(lei)器(qi)(qi)防(fang)的雷(lei)，其實是(shi)(shi)(shi)電(dian)(dian)(dian)壓峰值高，電(dian)(dian)(dian)流大(da)，時(shi)間非常短的感應雷(lei)。熔(rong)(rong)(rong)斷(duan)(duan)器(qi)(qi)要(yao)熔(rong)(rong)(rong)斷(duan)(duan)要(yao)滿足一(yi)定的條件(jian)，那(nei)就(jiu)是(shi)(shi)(shi)能量(liang)積累，瞬態(tai)的雷(lei)擊很顯(xian)然不(bu)(bu)會在防(fang)雷(lei)器(qi)(qi)工作(zuo)時(shi)把熔(rong)(rong)(rong)斷(duan)(duan)器(qi)(qi)給(gei)熔(rong)(rong)(rong)斷(duan)(duan)了(le)(le)(le)。因(yin)為有(you)了(le)(le)(le)熔(rong)(rong)(rong)斷(duan)(duan)器(qi)(qi)所(suo)以不(bu)(bu)管你(ni)(ni)所(suo)謂的A還是(shi)(shi)(shi)B都不(bu)(bu)會燒(shao)壞(huai)電(dian)(dian)(dian)路(lu)，而只是(shi)(shi)(shi)讓(rang)熔(rong)(rong)(rong)斷(duan)(duan)器(qi)(qi)斷(duan)(duan)路(lu)，從而使電(dian)(dian)(dian)路(lu)安全(quan)的斷(duan)(duan)開(kai)(kai) 。
BUSSMANN 熔斷器
浪涌保護器加熔斷器的目的：
1，防止因雷擊而產生的工頻續流（針對放電間隙型器件）對SPD及其線路的損壞。
2，方便維護更換SPD。
3，防止因SPD老化（如mov器件的漏流增大）而造成線路故障 SPD前端熔斷器應根據避雷器廠家的參數安裝。 如廠家沒有規定，一般選用原則： 根據（浪涌保護器的最大保險絲強度A）和（所接入配電線路最大供電電流B）來確定（開關或熔斷器的斷路電流C）。
確定方法： 當：B>A時 C小于等于A 當：B＝A時 C小于A或不安裝C當：B
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