Neutrik NAC3FXXA-W-S is a locking AC mains cable connector, keyed and color coded (blue) for power-in, screw terminal assembly, for cable diameters 6 - 12 mm.
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.