Topological structure of main circuit of intelligent drainage branch

The invention belongs to the technical field of drainage cabinets, and relates to a drainage branch, in particular to an intelligent drainage branch main circuit topological structure, which solves the technical problems in the background technology, and comprises at least one reverse blocking type controllable power device, a current limiting resistor and at least one switching device which are connected in series, wherein the reverse blocking type controllable power device is a reverse blocking type IGCT (integrated gate commutated thyristor) or a reverse blocking type gate turn-off thyristor. According to the combination disclosed by the invention, a short-circuit current tolerance short plate is eliminated, and the short-circuit current tolerance capability of the whole drainage branch is greatly improved; the installation mode and the size of the reverse blocking type controllable power device are similar to those of a power diode, the layout space of the power device and the number of main circuit devic