PowerCON NAC3MPA-1 (power in) - powerCON NAC3MPB-1 (power out), coupler for linking cables powerCON 20 A. The powerCON is a locking 3 conductor equipment AC connector with contacts for line, neutral and pre-mating ground contact. It replaces appliance couplers wherever a very rugged solution in combination with a locking device is needed in order to guarantee a safe power connection. Attention: The powerCON is a connector without breaking capacity, i.e. the powerCON should not be connected or disconnected under load or live.