An installation switching device comprises a housing having a front and a rear face, a mounting side, at least one front and rear narrow side, two wide sides and having an opening at least on the rear face. The installation switching device further comprises a screwless terminal connection including a clamping spring disposed in a terminal connection space and configured to connect a plurality of connecting conductors and a terminal cover part swivelably connected to the housing and configured to cover the opening, the terminal cover part having a terminal face with a plurality of terminal openings, each corresponding to one of the plurality of connecting conductors to be connected and a guide device molded onto each of the at least one terminal openings and configured to guide the connecting conductors.