A45 4-pole contactors are mainly used for controlling non-inductive or slightly inductive loads (i.e. resistance furnaces .) and generally for controlling power circuits up to 690 v AC and 440 v DC. The contactors can also be used for many other applications such lighting. The A series 4-pole contactors are of the block type design. Main poles and auxiliary contact blocks: 4 n.o. main poles, 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.