ProX XC-PWC-COUPLER ProX XC-PWC-COUPLER PowerKon Cable Coupler Adapter BLUE Power In to GRAY Power Out. This PowerKon cable coupler is equipped with a locking 3-pole (AC) connector with connections for neutral, line, and ground. XC-PWC-COUPLER is rated 20A/250V AC, it has power-in (BLUE) on one side, and Power Out (GRAY) on the opposite side. The contacts inside the coupler prevent arching damage when the cable is disconnected under load.