Switchgear cabinet system having a base module and at least one functional module, wherein the functional module has a functional housing, wherein the functional housing has a first passage opening on a bottom side, wherein a functional connection element of the functional module is arranged in the functional housing and in the region of the first passage opening, wherein the base module has a base housing, wherein the base housing has a second passage opening on a top side, wherein a base connection element of the base module is arranged in the base housing and in the region of the second passage opening, wherein the functional housing bears against the top side of the base housing by way of the bottom side, wherein the functional connection element and the base connection element interengage and form an interface, characterized in that the switchgear cabinet system has a sealing insert (26, 49) with a frame, wherein the frame of the sealing insert (26, 49) has a functional portion engaging into the functional housing and a base portion engaging into the base housing, wherein the functional portion of the frame bears against an inner wall of the functional housing, wherein the base portion of the frame bears against a wall of the base housing bordering the second passage opening, wherein the frame of the sealing insert (26, 49) has a first groove and a second groove, wherein the first groove is designed so as to run around the functional portion of the frame and the second groove is designed so as to run around the base portion of the frame, wherein a first seal is arranged in the first groove and bears against the inner wall of the functional housing, wherein a second seal is arranged in the second groove and bears against the wall of the base housing that surrounds the second passage opening, wherein the bottom side of the functional housing has a third groove bordering the first passage opening, wherein a third seal is arranged in the third groove and bears against the top side of the base housing. having a base module and at least one functional module, wherein the functional module has a functional housing, wherein the functional housing has a first passage opening on a bottom side, wherein a functional connection element of the functional module is arranged in the functional housing and in the region of the first passage opening, wherein the base module has a base housing, wherein the base housing has a second passage opening on a top side, wherein a base connection element of the base module is arranged in the base housing and in the region of the second passage opening, wherein the functional housing bears against the top side of the base housing by way of the bottom side, wherein the functional connection element and the base connection element interengage and form an interface, characterized in that the switchgear cabinet system has a sealing insert (26, 49) with a frame, wherein the frame of the sealing insert (26, 49) has a functional portion engaging into the functional housing and a base portion engaging into the base housing, wherein the functional portion of the frame bears against an inner wall of the functional housing, wherein the base portion of the frame bears against a wall of the base housing bordering the second passage opening, wherein the frame of the sealing insert (26, 49) has a first groove and a second groove, wherein the first groove is designed so as to run around the functional portion of the frame and the second groove is designed so as to run around the base portion of the frame, wherein a first seal is arranged in the first groove and bears against the inner wall of the functional housing, wherein a second seal is arranged in the second groove and bears against the wall of the base housing that surrounds the second passage opening, wherein the bottom side of the functional housing has a third groove bordering the first passage opening, wherein a third seal is arranged in the third groove and bears against the top side of the base housing.