This series of auxiliary conductive joints are installed on the top of the LA1-D control relay or LC1-D contactor. Used to expand the connection of auxiliary contact points. Due to the contact function of sliding friction, this product can clean itself, ensuring the reliability of the circuit. LA2-D delay relay is suitable for LC1-D AC contactor and LA1-D auxiliary contact group, assembled into LC3-D star-delta decompression starter, used for motor starting.