Neutrik powercon nac3mm 1 coupler neutrik nac3mm 1 the neutrik powercon nac3mm 1 is a locking 3 conductor equipment ac connector with contacts for line neutral and pre mating ground contact it is designed to replace appliance couplers wherever a very rugged solution in combination with a locking device is needed in order to guarantee a safe power connection neutrik nac3mm 1 ac power connector plug 20a