Abstract: The present invention is a power line cut-out switch used in power transmission system comprising a base member having a vertical extension member perpendicularly attached thereon that secures a mechanical jumper used when transferring power lines from one electrical post to another. The vertical member can include a mushroom top member to further secure the mechanical jumper. The mechanical jumper is mounted to the vertical extension member to provide a stable and secure point of engagement when transferring power lines. This avoids electrocution to workers by no longer having to connect the mechanical jumper to flimsy solid jumpers and helps provide more uninterrupted power supply to consumers when installing new posts or shifting old posts to a new location.