①防止操作過電壓防護電路

        

caozuoguodianyashidianlugongzuozhuangtaituranbianhuashi，diancinengliangjijuzhuanhua，kuaisushifangshichanshengdeyizhongguodianya，fangzhizhezhongguodianyakeyiyongyamindianzuqibaohugezhongdianyuanshebei、電機等。

 

②電路輸入過壓保護

        

大氣過電壓由於雷擊引起，大多數屬於感應性過電壓

，雷擊對輸電線路放電產生的過電壓，這種過電壓的電壓值很高，可達100～10000V，造zao成cheng的de危wei害hai極ji大da。因yin此ci對dui於yu必bi須xu對dui電dian氣qi設she備bei采cai取qu措cuo施shi防fang止zhi大da氣qi過guo電dian壓ya。可ke以yi采cai用yong壓ya敏min電dian阻zu器qi。一yi般ban采cai用yong與yu設she備bei並bing聯lian。如ru果guo電dian氣qi設she備bei要yao求qiu殘can壓ya很hen低di時shi，可ke以yi采cai用yong多duo級ji防fang護hu。

 

③半導體器件的過壓保護

        

weilefangzhibandaotiqijiangongzuoshiyouyumouxieyuanyinchanshengguodianyashibeishaohui
，changyongyamindianzujiayibaohu
，zaijingtiguanfashejihejidianjizhijian，huozhezaibianyaqideyicilianjieyamindianzu，nengyouxiaodibaohuguodianyaduijingtiguandesunshang。zaizhengchangzhuangtaixia
，yamindianzuchenggaozutai，zhiyouhenxiangdeloudianliu，erdangchengshouguodianyashi，yamindianzuxunsubianchengdizuzhuangtai，guodianyanengliangyifangdiandianliudexingshibeiyamindianzuxishou，langyongdianyaxiaoshiyihou，dangdianluhuoyuanjianchengshouzhengchangdianyashi，yamindianzuyouhuifudaogaozuzhuangti。duiyuerjiguanhejingzhaguanlaishuo，yibanjiangyamindianzuhezhexiebandaotiyuanjianbinglianhuozheyudianyuanbinglian

，erqieyingmanzulianggeyaoqiu：一是重複動作的方向電壓要大與壓敏電阻的殘壓
，二是非重複動作的反向電壓也要大於壓敏電阻的殘壓。

 

④接觸器、繼電器防護器

        

當dang切qie斷duan含han有you接jie觸chu器qi，繼ji電dian器qi等deng感gan性xing負fu載zai的de的de電dian路lu時shi，其qi過guo電dian壓ya可ke以yi超chao過guo電dian源yuan電dian壓ya的de數shu倍bei，過guo電dian壓ya造zao成cheng接jie點dian間jian電dian弧hu和he火huo花hua放fang電dian
，燒shao損sun觸chu頭tou，縮suo短duan設she備bei壽shou命ming。由you於yu壓ya敏min電dian阻zu在zai高gao電dian位wei的de分fen流liu作zuo用yong

，從cong而er保bao護hu了le觸chu點dian。壓ya敏min電dian阻zu和he線圈並(bing)聯(lian)時(shi)，觸(chu)點(dian)間(jian)的(de)過(guo)電(dian)壓(ya)等(deng)於(yu)電(dian)源(yuan)電(dian)壓(ya)與(yu)壓(ya)敏(min)電(dian)阻(zu)殘(can)壓(ya)之(zhi)和(he)，壓(ya)敏(min)電(dian)阻(zu)吸(xi)收(shou)的(de)能(neng)量(liang)為(wei)線(xian)圈(quan)存(cun)儲(chu)的(de)能(neng)量(liang)
，壓(ya)敏(min)電(dian)阻(zu)與(yu)觸(chu)點(dian)串(chuan)聯(lian)時(shi)，觸(chu)點(dian)的(de)過(guo)電(dian)壓(ya)等(deng)於(yu)壓(ya)敏(min)電(dian)阻(zu)的(de)殘(can)壓(ya)

，壓(ya)敏(min)電(dian)阻(zu)吸(xi)收(shou)的(de)能(neng)量(liang)為(wei)線(xian)圈(quan)存(cun)儲(chu)能(neng)量(liang)的(de)1.2倍。

 

 

以上便是壓敏電阻在電路中起到的一些應用了。