An electrical connector including an electrically conductive shell sized to receive and retain an electrically insulating housing insert, where the housing insert includes a cavity for receiving and retaining a wire-terminating electrical contact therein. The shell and housing insert each including keying features designed to cooperate with one another to resist independent rotation of the housing insert within the shell. The electrical connector further includes a wire sealing grommet coupled to the housing insert to improve connector performance and minimize arcing issues.