AC contactors often adopt three arc extinguishing methods: double break electric arc extinguishing, longitudinal seam arc extinguishing and grid arc extinguishing. It is used to eliminate the electric arc generated during the opening and closing of moving and static contacts. Contactors with a capacity of more than 10A are equipped with arc extinguishing devices. The AC contactor also has auxiliary parts such as reaction spring, buffer spring, contact pressure spring, transmission mechanism, base and terminal.