During the continuous transformation and construction of the urban distribution network, a large number of overhead lines in the city were replaced by cable lines, and the pole switches were replaced by switch cabinets. DFT6-12 (40.5) outdoor ring network box is a new type of power supply equipment designed by Tianan Electric to cooperate with the 10kV (35kV) power network cable system. It is widely used at the cable node in the 10kV (35kV) system as the reception and distribution of electric energy. For use. Each ring network line in the product is equipped with a load switch or vacuum circuit breaker, any branch circuit can be freely exited and put into operation, and other ring network circuits are not affected. When the combined electrical scheme is adopted, when a short circuit fault occurs in a branch circuit, the fuse on the branch circuit can quickly disconnect the fault circuit and hit the release of the load switch to open the fault circuit. This ensures that the fault circuit is isolated. Continuity of power supply for non-faulty branch circuits.