描述
它的输出接点之所以会出现外接K合闸而不能使之分闸的故障现象，是因为KD的动合触头在分断时出现粘合现象。动合触头被粘合，原因有二：（1）与之并联的RC支路元件可能损坏，或者断线，灭弧能力下降，使KD动合触头分断时可能被粘合住；（2）外接的K容量过大。因K容量大时，线圈中贮存的磁场能量就大，当超过PLC输出接点的分断能力时进行分断，PLC输出继电器的动合触头有可能被粘合住。
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