The 4-pole contactors come in four sizes, ranging from 20 A to 200 A, and have been purpose-built for AC 1 circuit applications. The accessory range is uniform across the series, meaning all the well-proven components from the 3-pole range can be used here too. These contactors are ideally suited to applications involving frequent mains switch-off or switch-over, as well as to heating systems and the switching of 4-pole loads.