A switch for power lines which is actuated by a supporting rotatable insulator. A first insulator has a bearing at each end, one to be attached to a support such as a pole, and the other to the conductor of the power line. The first insulator is freely rotatable without moving the conductor. A second insulator structurally interconnects two segments of the conductor, and a movable switch blade movable by rotation of the first insulator connects or interconnects the segments. This invention makes possible the innovation of remotelyactuated group operation of a plurality of in-line switches, in addition to its capability of individual operation of a single switch.