Abstract: An electrical connector segment, for use in industrial and transportation application, which provides engagement to another complementary coupler segment with fine incremental adjustment and prevents disengagement from vibration, jarring and shock and by those unfamiliar with its function, including a backshell assembly for joining an electrical cable to the connector segment, with the same features plus means by which ready access is provided to the juncture, of the wire leads of the cable, with the connector elements within the connector segment for maintenance, repair and modification.