AF Series Contactors ABB Series AF Contactors are primarily used for switching 3-phase motors and controlling power circuits of up to 690V ac or 440V dc. They are also suitable for many other applications such as insulation, switching capacitors and in lighting systems. The AF series 3 pole contactors are available in a wide range of coil voltages and current ratings and feature a built on auxiliary contact. Easy Maintenance of Contacts and Coil Inspection DIN rail or screw mounting Touch Safe Design Add-on auxiliary contact blocks and thermal overload relays available separately