Neutrik® NAC3FXX Powercon Connectors Locking AC mains cable connector, keyed and colour coded for power-out, screw terminal assembly, for cable diameters 6-12mm and 10-16mm. The powercon FXXA/FXXB is a single phase (3 conductor) lockable power connector with Circuit Breaking Capability when mated with powercon XX Series receptacles. It replaces appliance couplers wherever a very rugged solution in combination with a locking device is needed to guarantee a safe power connection.