ASL Series Contactors ABB Series ASL Contactors are primarily used for switching 3-phase motors and controlling power circuits of up to 690V ac or 220V dc. They are also suitable for many other applications such as insulation, switching capacitors and in lighting systems. The ASL series 3 pole contactors feature spring terminal connections and are available in a wide range of DC coil voltages and current ratings and feature a built on auxiliary contact.