An electrical connector assembly including a plug having an open end and an inner shell that extends distally to an elongate partial tubular mounting portion, and a complementary receptacle similarly configured so as to form an enclosure with the plug when mated. Each of the plug and receptacle include a longitudinally oriented contact array having a plurality of termination points for terminating conductors and a plurality of contacts for matable electrical contact with the other connector member. A locking feature locks the plug and receptacle in a mated configuration. The connector facilitates the termination of additional conductors without the need to expand the outer diameter or circumference of the connector housings.