A shielded coaxial termination device includes a center conductor having a front end and a barrel encircling the center conductor. The barrel includes a front end and an annular sidewall defining an interior configured to receive and electrically couple with a coaxial post. A shield, having a front end and an opposed rear end, is mounted to the barrel so as to deploy from a retracted position toward an advanced position to radially cover the center conductor when the barrel is not fully installed on a coaxial post.