The utility model provides a power transmission and distribution are glass fiber protective tube for switch, including glass fiber pipe, set up bimetallic strip and additional mechanism among the glass fiber pipe, bimetallic strip and the stack of fixed electric conductor set up in glass fiber pipe, and bimetallic strip and fixed conductor connecting are electrically conductive, and additional establishment of institution is in the stack position of bimetallic strip and fixed electric conductor, it produced the heavy current to take place short -circuit fault when the equipment logical OR circuit, bimetallic strip is heated and takes place to warp, between breaking away from, its and fixed electric conductor form the clearance, during two even movable insulation connecting rod's lower insulator spindle inserts the clearance of the two under the effect of extension spring, prevent bimetallic strip to reset and fix the electric conductor switch -on, the disconnection is connected with the wiring end, compare with traditional fusion tube, do not need frequently to change the protective tube, the operation on workman's pole time is shortened, simple structure, the implementation process is swift, it is convenient, and the device is safe, reliabl, and therefore the work efficiency is raised.