A40 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, and 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, and 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.