Static side shielding cover for arc-extinguishing chamber of circuit breaker

The utility model relates to the technical field of high-voltage switches, and specifically relates to a static side shielding cover for an arc-extinguishing chamber of a circuit breaker. The cover comprises a cover body, and the cover body is a cylindrical housing with two opening ends, wherein the upper opening end is provided with a circular arc transition part. An end edge of the cylindrical housing is bent inwards to form a circular arc transition part. The cover is in an integrated rotating shielding cover structure, effectively improves the distribution of an electric field in the arc-extinguishing chamber, absorbs a part of arc energy, and condenses arc products. When a short-circuit current is cut off in the arc-extinguishing chamber, most of the thermal energy generated by arcs is absorbed by a shielding system, thereby facilitating the improvement of recovery intensity of a medium between contacts. Meanwhile, the rotating threaded installation mode of the cover effectively avoids the problems of corner angles possibly caused by the installation technology and an operation process, thereby preventing discharging and insulating breakdown caused by the uneven distribution of electric levels from happening, and guaranteeing the safe and stable operation of a power system.