Bernstein開(kai)關/博(bo)恩(en)斯坦限(xian)位開(kai)關又稱行(xing)程(cheng)限(xian)位開(kai)關,用於控(kong)制機(ji)械(xie)設備的行程(cheng)及限(xian)位保(bao)護。在(zai)實(shi)際(ji)生產(chan)中(zhong),將行程(cheng)限(xian)位開(kai)關安裝(zhuang)在(zai)預(yu)先安排(pai)的位置(zhi),當裝於生產(chan)機(ji)械(xie)運(yun)動(dong)部件上的模(mo)塊(kuai)撞擊行(xing)程(cheng)開(kai)關時(shi),行(xing)程(cheng)限(xian)位開(kai)關的觸(chu)點動(dong)作,實(shi)現(xiàn)(xian)電(dian)路的切(qie)換(huan)