Protection cover for a protection cover assembly for a rotating electric machine, comprising: - a shell body and an axial end plate which at least partially form a shield chamber, - wherein the shell body forms a machine end face for arranging the protection cover on a rotating electric machine, - wherein the axial end plate is arranged at a distance from the machine end face with respect to an axial axis of the protection cover, - wherein the shell body comprises at least one insertion opening for inserting a brush holder of the protection cover assembly at least partially in the shield chamber along an insertion axis of the protection cover, - wherein the insertion axis of the protection cover is oriented perpendicularly to the axial axis of the protection cover said axial axis being substantially perpendicular to the axial end plate, - wherein at least two guiding ribs (34, 34a) are arranged in the shield chamber for a guiding of the brush holder along the insertion axis, - wherein the at least two guiding ribs (34, 34a) are at least partially arranged on the axial end plate, - wherein the at least two guiding ribs (34, 34a) are at least partially spaced apart from each other with respect to a transverse axis of the protection cover, - wherein the transverse axis of the protection cover is substantially perpendicular to the axial axis of the protection cover, - wherein the transverse axis of the protection cover is substantially perpendicular to the insertion axis of the protection cover, and - wherein the spacing between the at least two guiding ribs (34, 34a) with respect to the transverse axis of the protection cover varies at least in sections along the insertion axis of the protection cover. - a shell body and an axial end plate which at least partially form a shield chamber, - wherein the shell body forms a machine end face for arranging the protection cover on a rotating electric machine, - wherein the axial end plate is arranged at a distance from the machine end face with respect to an axial axis of the protection cover, - wherein the shell body comprises at least one insertion opening for inserting a brush holder of the protection cover assembly at least partially in the shield chamber along an insertion axis of the protection cover, - wherein the insertion axis of the protection cover is oriented perpendicularly to the axial axis of the protection cover said axial axis being substantially perpendicular to the axial end plate, - wherein at least two guiding ribs (34, 34a) are arranged in the shield chamber for a guiding of the brush holder along the insertion axis, - wherein the at least two guiding ribs (34, 34a) are at least partially arranged on the axial end plate, - wherein the at least two guiding ribs (34, 34a) are at least partially spaced apart from each other with respect to a transverse axis of the protection cover, - wherein the transverse axis of the protection cover is substantially perpendicular to the axial axis of the protection cover, - wherein the transverse axis of the protection cover is substantially perpendicular to the insertion axis of the protection cover, and - wherein the spacing between the at least two guiding ribs (34, 34a) with respect to the transverse axis of the protection cover varies at least in sections along the insertion axis of the protection cover.