The utility model relates to a cable branch case with fuse -switch -disconnector, box door including box and hank dress, three -phase bus row installs on the bottom plate of box, zero row below installation in that the three -phase bus is arranged is not arranged with ground, , installs the three -phase bus inlet wire base and four bases of being qualified for the next round of competitions on arranging, installation inlet wire isolator in the inlet wire base, install the isolator that is qualified for the next round of competitions in four bases of being qualified for the next round of competitions, on the inlet wire base, correspond three -phase bus row, install three inlet wire handle respectively, installation inlet wire isolator's fuse in the inlet wire handle, on every is qualified for the next round of competitions the base, correspond three -phase bus row, install the three handle of being qualified for the next round of competitions respectively, install the isolator's that is qualified for the next round of competitions fuse in the handle of being qualified for the next round of competitions. The utility model discloses a fuse conduct protection components and parts, the stable performance, it is strong to environmental suitability, avoided the maloperation simultaneously, ensured the continuation of power consumption.