Milestock Powercon Male to Female Connector Extension Adapter NAC3MPA-1 to powerCON NAC3MPB-1 Coupler for Linking Cables. Milestock powerCON NAC3MPA-1 to powerCON NAC3MPB-1 Coupler for Linking Cables is a locking 3 conductor equipment AC connector with contacts for line, neutral, and pre-mating ground contacts. This device replaces appliance couplers wherever a very rugged solution in combination with a locking device is needed in order to ensure a safe power connection. The PowerCON is a connector without breaking capacity. It should not be connected or disconnected under load or live. PowerCON NAC3MPA-1 (power in) to PowerCON NAC3MPB-1 (power out). Lockable 3 pole equipment (AC) connector. High current capacity, rated at 20A / 250VAC. Color coded for easy identification, powerCON offers power-in (blue) and power-out (grey) versions with different keying to avoid the possibility of intermating. Fast and easy locking system. Extremely robust and reliable.