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壓敏電(dian)(dian)(dian)阻，英(ying)文MOV（Metal Oxide Varistors），是壹種(zhong)對電(dian)(dian)(dian)壓變化(hua)(hua)反應(ying)靈(ling)敏的限壓型浪湧器(qi)件。目(mu)前市場上應(ying)用於低壓電(dian)(dian)(dian)器(qi)浪湧保(bao)護的壓敏電(dian)(dian)(dian)阻多為氧(yang)(yang)化(hua)(hua)鋅為主體材料的壓敏電(dian)(dian)(dian)阻，以氧(yang)(yang)化(hua)(hua)鋅為主體，摻雜多種(zhong)金屬氧(yang)(yang)化(hua)(hua)物(wu)，采(cai)用典型的電(dian)(dian)(dian)子陶瓷工藝制(zhi)成的多晶半導(dao)體陶瓷元器(qi)件。

壓(ya)(ya)敏(min)電(dian)(dian)阻(zu)具有對稱(cheng)的(de)(de)(de)(de)(de)伏安特性曲(qu)線，流(liu)過(guo)MOV的(de)(de)(de)(de)(de)電(dian)(dian)流(liu)隨MOV兩端電(dian)(dian)壓(ya)(ya)的(de)(de)(de)(de)(de)增大(da)(da)呈(cheng)指(zhi)數(shu)規(gui)律增大(da)(da)。應(ying)用時(shi)(shi)，MOV壹(yi)般並(bing)聯在電(dian)(dian)路(lu)(lu)(lu)中(zhong)，當電(dian)(dian)路(lu)(lu)(lu)正(zheng)(zheng)常(chang)工作時(shi)(shi)，它處於高阻(zu)狀(zhuang)(zhuang)態，不影響電(dian)(dian)路(lu)(lu)(lu)正(zheng)(zheng)常(chang)工作。當電(dian)(dian)路(lu)(lu)(lu)出(chu)現異常(chang)瞬(shun)時(shi)(shi)過(guo)電(dian)(dian)壓(ya)(ya) 並(bing)達(da)到其導通(tong)電(dian)(dian)壓(ya)(ya)時(shi)(shi)，MOV迅速由(you)高阻(zu)狀(zhuang)(zhuang)態變為低阻(zu)狀(zhuang)(zhuang)態，泄放(fang)由(you)異常(chang)瞬(shun)時(shi)(shi)過(guo)電(dian)(dian)壓(ya)(ya)導致的(de)(de)(de)(de)(de)瞬(shun)時(shi)(shi)過(guo)電(dian)(dian)流(liu)，同(tong)時(shi)(shi) 把異常(chang)瞬(shun)態過(guo)壓(ya)(ya)鉗制(zhi)在壹(yi)個安全水平之內(nei)，從而保(bao)(bao)護(hu)後級(ji)電(dian)(dian)路(lu)(lu)(lu)免遭異常(chang)瞬(shun)時(shi)(shi)過(guo)電(dian)(dian)壓(ya)(ya)的(de)(de)(de)(de)(de)損壞。MOV具有較高的(de)(de)(de)(de)(de)瞬(shun)時(shi)(shi)脈沖吸收 能力(li)，電(dian)(dian)容量較大(da)(da)，壹(yi)般應(ying)用於AC 交(jiao)流(liu)輸入端防雷保(bao)(bao)護(hu)。由(you)於壓(ya)(ya)敏(min)電(dian)(dian)阻(zu)的(de)(de)(de)(de)(de)電(dian)(dian)湧吸收能力(li)取決(jue)於它的(de)(de)(de)(de)(de)物理尺寸(cun)，可(ke)通(tong)過(guo)定制(zhi)制(zhi)造(zao)不同(tong)大(da)(da)小的(de)(de)(de)(de)(de)MOV而獲得不同(tong)的(de)(de)(de)(de)(de)瞬(shun)態浪湧電(dian)(dian)流(liu)值。