微動(dong)開(kai)關(guan)(guan)是一(yi)(yi)種施(shi)壓促(cu)動(dong)的(de)快速(su)(su)開(kai)關(guan)(guan)，又叫靈敏開(kai)關(guan)(guan)。一(yi)(yi)種行程很小(xiao)的(de)、瞬時(shi)動(dong)作(zuo)(zuo)的(de)主令電(dian)(dian)器(qi). 微動(dong)開(kai)關(guan)(guan)是小(xiao)型的(de)接(jie)觸(chu)(chu)開(kai)關(guan)(guan)，手輕輕碰一(yi)(yi)下(xia)就接(jie)通，工(gong)廠里常(chang)用作(zuo)(zuo)大(da)開(kai)關(guan)(guan)內(nei)部(bu)的(de)短路、過流保(bao)護.  當外界機械力作(zuo)(zuo)用于操(cao)作(zuo)(zuo)鈕時(shi)，操(cao)作(zuo)(zuo)鈕便向下(xia)運動(dong)，通過拉(la)鉤將彈(dan)(dan)簧(huang)(huang)拉(la)伸。當彈(dan)(dan)簧(huang)(huang)拉(la)到(dao)一(yi)(yi)定長度后，動(dong)簧(huang)(huang)片迅速(su)(su)向下(xia)運動(dong)，動(dong)簧(huang)(huang)片右端(duan)的(de)觸(chu)(chu)頭(tou)轉(zhuan)向與下(xia)面的(de)常(chang)開(kai)觸(chu)(chu)頭(tou)接(jie)觸(chu)(chu)，從(cong)而實現(xian)電(dian)(dian)路的(de)轉(zhuan)換。如果去(qu)除外力，在彈(dan)(dan)簧(huang)(huang)恢(hui)復力的(de)作(zuo)(zuo)用下(xia)，觸(chu)(chu)頭(tou)又瞬時(shi)地進(jin)行轉(zhuan)換。再加裝(zhuang)一(yi)(yi)些滾輪(lun)或壓塊，則(ze)可派(pai)生出其他結構型式(shi)的(de)微動(dong)開(kai)關(guan)(guan)，可適(shi)應(ying)不同用途(tu)。廣泛應(ying)用在鼠標，家用電(dian)(dian)器(qi)，工(gong)業機械，摩托(tuo)車(che)等地方，開(kai)關(guan)(guan)雖小(xiao)，但起著(zhu)不可替代的(de)作(zuo)(zuo)用。  
    微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)(dong)開(kai)(kai)關(guan)(guan)的(de)工作(zuo)(zuo)(zuo)(zuo)原理是：外機械(xie)力(li)(li)(li)通過傳(chuan)動(dong)(dong)(dong)(dong)(dong)(dong)元(yuan)件(jian)（按(an)銷、按(an)鈕(niu)、杠桿、滾(gun)(gun)輪等(deng)）將力(li)(li)(li)作(zuo)(zuo)(zuo)(zuo)用(yong)(yong)于動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)簧(huang)(huang)片上，并(bing)將能量積聚(ju)到(dao)臨(lin)界點后，產生瞬(shun)時動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)，使動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)簧(huang)(huang)片末端(duan)的(de)動(dong)(dong)(dong)(dong)(dong)(dong)觸(chu)點與(yu)定觸(chu)點快(kuai)速接通或斷(duan)(duan)開(kai)(kai)。當傳(chuan)動(dong)(dong)(dong)(dong)(dong)(dong)元(yuan)件(jian)上的(de)作(zuo)(zuo)(zuo)(zuo)用(yong)(yong)力(li)(li)(li)移去后，動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)簧(huang)(huang)片產生反向(xiang)動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)力(li)(li)(li)，當傳(chuan)動(dong)(dong)(dong)(dong)(dong)(dong)元(yuan)件(jian)反向(xiang)行程(cheng)達到(dao)簧(huang)(huang)片的(de)動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)臨(lin)界點后，瞬(shun)時完成反向(xiang)動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)。微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)(dong)開(kai)(kai)關(guan)(guan)的(de)觸(chu)點間距小、動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)行程(cheng)短、按(an)動(dong)(dong)(dong)(dong)(dong)(dong)力(li)(li)(li)小、通斷(duan)(duan)迅速。其(qi)動(dong)(dong)(dong)(dong)(dong)(dong)觸(chu)點的(de)動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)速度與(yu)傳(chuan)動(dong)(dong)(dong)(dong)(dong)(dong)元(yuan)件(jian)動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)(zuo)速度無關(guan)(guan)。微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)(dong)開(kai)(kai)關(guan)(guan)以(yi)按(an)銷式(shi)為基(ji)本型(xing)，可(ke)派生按(an)鈕(niu)短行程(cheng)式(shi)、按(an)鈕(niu)大(da)行程(cheng)式(shi)、按(an)鈕(niu)特大(da)行程(cheng)式(shi)、滾(gun)(gun)輪按(an)鈕(niu)式(shi)、簧(huang)(huang)片滾(gun)(gun)輪式(shi)、杠桿滾(gun)(gun)輪式(shi)、短動(dong)(dong)(dong)(dong)(dong)(dong)臂式(shi)、長動(dong)(dong)(dong)(dong)(dong)(dong)臂式(shi)等(deng)等(deng)。微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)(dong)開(kai)(kai)關(guan)(guan)在(zai)電子設(she)備(bei)及其(qi)他(ta)設(she)備(bei)中用(yong)(yong)于需頻繁換接電路(lu)的(de)自動(dong)(dong)(dong)(dong)(dong)(dong)控制及安全保(bao)護等(deng)裝置中。微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)(dong)開(kai)(kai)關(guan)(guan)分(fen)為大(da)型(xing)、中型(xing)、小型(xing)，按(an)不(bu)同(tong)的(de)需要(yao)分(fen)有(you)可(ke)以(yi)有(you)防水(shui)型(xing)（放在(zai)液體環境中使用(yong)(yong)）和普通型(xing)，開(kai)(kai)關(guan)(guan)連接兩個線路(lu)，為電器、機器等(deng)提供通斷(duan)(duan)電控制。 
    而對(dui)微(wei)動開(kai)(kai)關的(de)(de)控制，又(you)是(shi)利用(yong)控制節氣門(men)開(kai)(kai)度之油門(men)拉線(xian)凸(tu)輪來實現(xian)的(de)(de)。微(wei)動開(kai)(kai)關安裝(zhuang)在拉線(xian)凸(tu)輪合適位(wei)置上，油門(men)拉線(xian)凸(tu)輪回位(wei)時(shi)，頂住微(wei)動開(kai)(kai)關臂(bei)，斷(duan)開(kai)(kai)繼(ji)電(dian)器電(dian)磁(ci)線(xian)圈電(dian)源，繼(ji)電(dian)器斷(duan)開(kai)(kai)