A12 contactors are mainly used for controlling 3-phase motors and generally for controlling power circuits up to 690 v AC or 220 v DC. The contactors can also be used for many other applications such as isolation, capacitor switching, lighting. The A series 1-stack 3-pole contactors are of the block type design. Main poles and auxiliary contact blocks: 3 main poles, 1 built-in auxiliary contact, front and side-mounted add-on auxiliary contact blocks - control circuit: AC operated with laminated magnet circuit - accessories: a wide range of accessories is available.