An electrical connector assembly includes a metal shell and a plurality of dielectric housings each housing a terminated end of each of a pair of flat cables of the type for transmission of electrical power at substantial current and voltage levels. Each mating terminal pair includes at least one having a contact section having an array of spring arm contact sections deflected by portions of the other when mated. Each termination is proximate a portion of a shell for heat dissipation. One of the shells is adapted for mounting to a bulkhead at a cutout, and the connectors are environmentally sealed to be appropriate for bulkhead mounting. Each connector includes a strain relief assembly suitable for use with flat cables of substantial rigidity and defines a cable exit, all after said terminated cables and housings therearound are assembled into the shell. A jackscrew system is used for facilitating connector mating.