當(dāng)線圈通電（電壓規(guī)格有ac380v、ac220v或dc220v、dc24v等）時，銜鐵及托板被鐵心吸引而瞬時下移，使瞬時動作觸點接通或斷開。但是活塞桿和杠桿不能同時跟著銜鐵一起下落，因為活塞桿的上端連著氣室中的橡皮膜，當(dāng)活塞桿在釋放彈簧的作用下開始向下運動時，橡皮膜隨之向下凹，上面空氣室的空氣變得稀薄而使活塞桿受到阻尼作用而緩慢下降。經(jīng)過一定時間，活塞桿下降到一定位置，便通過杠桿推動延時觸點動作，使動斷觸點斷開，動合觸點閉合。從線圈通電到延時觸點完成動作，這段時間就是繼電器的延時時間。延時時間的長短可以用螺釘調(diào)節(jié)空氣室進氣孔的大小來改變。

吸引線圈斷電后，繼電器依靠恢復(fù)彈簧的作用而復(fù)原?？諝饨?jīng)出氣孔被迅速排出。

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