LC1-K series AC contactor is suitable for using in the circuit up to the rated voltage 660 AC 50Hz/60Hz, rated current up to 12A, for frequent starting, controlling the AC motor. The addtion of auxiliary contact group to the contactor, combined with the proper thermal relay, can act to protect the circuit bound to overload. Contactor designed by traverse double breaking points, blocking and zero flash-over, it has characteristic of multi-functional combination, small volume and reliability, and can replace LC1-K, LC1-E series of TE company, products have been widely applied to signal magnifying switch in micro-electronics interface.