微動開關(guan)是一種施壓(ya)促(cu)動的(de)(de)快速開關(guan)，又叫靈敏開關(guan)。一種行(xing)程(cheng)很小(xiao)的(de)(de)、瞬(shun)時(shi)動作(zuo)的(de)(de)主令電(dian)器(qi). 微動開關(guan)是小(xiao)型的(de)(de)接(jie)觸(chu)開關(guan)，手輕輕碰一下就接(jie)通，工廠(chang)里(li)常(chang)用(yong)(yong)作(zuo)大開關(guan)內部的(de)(de)短(duan)路、過(guo)流(liu)保(bao)護.  當(dang)外界機(ji)械力(li)作(zuo)用(yong)(yong)于操作(zuo)鈕時(shi)，操作(zuo)鈕便向下運動，通過(guo)拉鉤將彈(dan)簧(huang)拉伸。當(dang)彈(dan)簧(huang)拉到一定長度后，動簧(huang)片迅速向下運動，動簧(huang)片右端的(de)(de)觸(chu)頭(tou)轉(zhuan)向與下面的(de)(de)常(chang)開觸(chu)頭(tou)接(jie)觸(chu)，從而實現電(dian)路的(de)(de)轉(zhuan)換。如果去(qu)除外力(li)，在(zai)彈(dan)簧(huang)恢復力(li)的(de)(de)作(zuo)用(yong)(yong)下，觸(chu)頭(tou)又瞬(shun)時(shi)地(di)進行(xing)轉(zhuan)換。再加(jia)裝一些滾輪或壓(ya)塊，則可派生(sheng)出其他結構型式的(de)(de)微動開關(guan)，可適應不同用(yong)(yong)途。廣(guang)泛(fan)應用(yong)(yong)在(zai)鼠標(biao)，家用(yong)(yong)電(dian)器(qi)，工業機(ji)械，摩托車等地(di)方，開關(guan)雖小(xiao)，但(dan)起著不可替代(dai)的(de)(de)作(zuo)用(yong)(yong)。  
    微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)開關(guan)的(de)工作(zuo)原理(li)是：外機械力(li)通(tong)過傳(chuan)動(dong)(dong)(dong)(dong)(dong)元件(jian)(jian)（按(an)銷(xiao)、按(an)鈕(niu)(niu)、杠(gang)(gang)桿(gan)、滾(gun)輪(lun)(lun)等(deng)(deng)）將力(li)作(zuo)用(yong)(yong)于動(dong)(dong)(dong)(dong)(dong)作(zuo)簧片(pian)上(shang)，并將能(neng)量積聚到臨界點(dian)后，產(chan)生(sheng)瞬時動(dong)(dong)(dong)(dong)(dong)作(zuo)，使(shi)動(dong)(dong)(dong)(dong)(dong)作(zuo)簧片(pian)末端的(de)動(dong)(dong)(dong)(dong)(dong)觸(chu)點(dian)與定觸(chu)點(dian)快速接通(tong)或斷(duan)開。當傳(chuan)動(dong)(dong)(dong)(dong)(dong)元件(jian)(jian)上(shang)的(de)作(zuo)用(yong)(yong)力(li)移去后，動(dong)(dong)(dong)(dong)(dong)作(zuo)簧片(pian)產(chan)生(sheng)反(fan)向動(dong)(dong)(dong)(dong)(dong)作(zuo)力(li)，當傳(chuan)動(dong)(dong)(dong)(dong)(dong)元件(jian)(jian)反(fan)向行(xing)程達(da)到簧片(pian)的(de)動(dong)(dong)(dong)(dong)(dong)作(zuo)臨界點(dian)后，瞬時完成反(fan)向動(dong)(dong)(dong)(dong)(dong)作(zuo)。微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)開關(guan)的(de)觸(chu)點(dian)間距小(xiao)(xiao)、動(dong)(dong)(dong)(dong)(dong)作(zuo)行(xing)程短、按(an)動(dong)(dong)(dong)(dong)(dong)力(li)小(xiao)(xiao)、通(tong)斷(duan)迅(xun)速。其(qi)動(dong)(dong)(dong)(dong)(dong)觸(chu)點(dian)的(de)動(dong)(dong)(dong)(dong)(dong)作(zuo)速度(du)與傳(chuan)動(dong)(dong)(dong)(dong)(dong)元件(jian)(jian)動(dong)(dong)(dong)(dong)(dong)作(zuo)速度(du)無關(guan)。微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)開關(guan)以按(an)銷(xiao)式(shi)為基本型(xing)，可派(pai)生(sheng)按(an)鈕(niu)(niu)短行(xing)程式(shi)、按(an)鈕(niu)(niu)大行(xing)程式(shi)、按(an)鈕(niu)(niu)特大行(xing)程式(shi)、滾(gun)輪(lun)(lun)按(an)鈕(niu)(niu)式(shi)、簧片(pian)滾(gun)輪(lun)(lun)式(shi)、杠(gang)(gang)桿(gan)滾(gun)輪(lun)(lun)式(shi)、短動(dong)(dong)(dong)(dong)(dong)臂式(shi)、長(chang)動(dong)(dong)(dong)(dong)(dong)臂式(shi)等(deng)(deng)等(deng)(deng)。微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)開關(guan)在電(dian)子(zi)設備(bei)及(ji)其(qi)他設備(bei)中(zhong)(zhong)用(yong)(yong)于需頻繁換接電(dian)路的(de)自動(dong)(dong)(dong)(dong)(dong)控制(zhi)及(ji)安全保護(hu)等(deng)(deng)裝置中(zhong)(zhong)。微(wei)(wei)動(dong)(dong)(dong)(dong)(dong)開關(guan)分為大型(xing)、中(zhong)(zhong)型(xing)、小(xiao)(xiao)型(xing)，按(an)不同的(de)需要分有可以有防水型(xing)（放在液體環境中(zhong)(zhong)使(shi)用(yong)(yong)）和普通(tong)型(xing)，開關(guan)連接兩個線(xian)路，為電(dian)器(qi)、機器(qi)等(deng)(deng)提供通(tong)斷(duan)電(dian)控制(zhi)。 
    而對(dui)微動(dong)(dong)(dong)開(kai)(kai)關(guan)的控(kong)制，又是(shi)利用控(kong)制節(jie)氣門(men)開(kai)(kai)度(du)之油門(men)拉(la)線(xian)凸輪來實(shi)現的。微動(dong)(dong)(dong)開(kai)(kai)關(guan)安裝在拉(la)線(xian)凸輪合(he)適(shi)位(wei)置上(shang)，油門(men)拉(la)線(xian)凸輪回位(wei)時，頂住微動(dong)(dong)(dong)開(kai)(kai)關(guan)臂，斷開(kai)(kai)繼(ji)電(dian)(dian)器電(dian)(dian)磁線(xian)圈電(dian)(dian)源(yuan)，繼(ji)電(dian)(dian)器斷開(kai)(kai)，停(ting)止向(xiang)電(dian)(dian)動(dong)(dong)(dong)渦輪供(gong)電(dian)(dian)，使產品停(ting)止工作。同(tong)理，節(jie)氣門(men)打開(kai)(kai)時，油門(men)拉(la)線(xian)凸輪松(song)開(kai)(kai)微動(dong)(dong)(dong)開(kai)(kai)關(guan)臂，微動(dong)(dong)(dong)開(kai)(kai)關(guan)閉合(he)，接(jie)通(tong)繼(ji)電(dian)(dian)器電(dian)(dian)磁線(xian)圈電(dian)(dian)源(yuan)，繼(ji)電(dian)(dian)器閉合(he)，向(xiang)電(dian)(dian)動(dong)(dong)(dong)渦輪供(gong)電(dian)(dian)，產品工作。利用不同(tong)發動(dong)(dong)(dong)機轉速下拉(la)線(xian)凸輪所在位(wei)置來觸動(dong)(dong)(dong)微動(dong)(dong)(dong)開(kai)(kai)關(guan)斷開(kai)(kai)或閉合(he)，就可(ke)實(shi)現對(dui)電(dian)(dian)動(dong)(dong)(dong)渦輪增壓器開(kai)(kai)關(guan)時間的人為控(kong)制。