A surgical device includes a handle assembly including a controller and a first electrical connector. The surgical device also includes an adapter assembly having: a tubular housing having a proximal end portion configured to couple to the handle assembly, and a distal end portion; a second electrical connector disposed at the proximal end portion and configured to couple to the first electrical connector; an electrical contact assembly disposed at the distal end portion; and a wire harness disposed within the tubular housing and interconnecting the second electrical connector and the electrical contact assembly. The surgical device also includes a surgical end effector configured to couple to the distal end portion of the adapter assembly, the surgical end effector includes an electrical contact configured to couple to the electrical contact assembly.