Electrical switching device comprising a switching device housing, which is made of moulded material and comprises supply-side and load-side cable connections, which are located on connection sides (12; 13) that face away from each other, and connection-side accessories, said switching device comprising the following features: - the switching device housing has first groove-shaped, undercut guiding and retaining recesses arranged on the connection side and extending perpendicularly to the front side, and at least one first locking cam which faces away from the front side with a first locking surface; - a protective cover, which is formed as an accessory and has two lateral protective walls and a front-side protective wall connecting said lateral protective walls, is equipped, on its end face facing the switching device, with first guiding and retaining mouldings which can be brought to engage behind and interlock with the first guiding and retaining recesses, and with at least one resiliently arranged first locking hook which faces the front-side protective wall with a second locking surface and is connectable to the first locking cam, - a cable clamp block formed as an accessory is equipped, on its back wall facing the switching device, with second guiding and retaining mouldings which have a corresponding position and shape to the first guiding and retaining mouldings and can be brought to engage behind and interlock with the first guiding and retaining recesses, and with at least one resiliently arranged third locking hook which faces the front side with a third locking surface and is connectable to the first locking cam, - the cable clamp block is equipped, on its front wall facing away from the switching device, with second guiding and retaining recesses which have a corresponding position and shape to the first guiding and retaining recesses and can be brought to engage behind and interlock with the first guiding and retaining mouldings, and with at least one second locking cam which has a corresponding position and shape to the first locking cam and is connectable to the first locking hook. - the switching device housing has first groove-shaped, undercut guiding and retaining recesses arranged on the connection side and extending perpendicularly to the front side, and at least one first locking cam which faces away from the front side with a first locking surface; - a protective cover, which is formed as an accessory and has two lateral protective walls and a front-side protective wall connecting said lateral protective walls, is equipped, on its end face facing the switching device, with first guiding and retaining mouldings which can be brought to engage behind and interlock with the first guiding and retaining recesses, and with at least one resiliently arranged first locking hook which faces the front-side protective wall with a second locking surface and is connectable to the first locking cam, - a cable clamp block formed as an accessory is equipped, on its back wall facing the switching device, with second guiding and retaining mouldings which have a corresponding position and shape to the first guiding and retaining mouldings and can be brought to engage behind and interlock with the first guiding and retaining recesses, and with at least one resiliently arranged third locking hook which faces the front side with a third locking surface and is connectable to the first locking cam, - the cable clamp block is equipped, on its front wall facing away from the switching device, with second guiding and retaining recesses which have a corresponding position and shape to the first guiding and retaining recesses and can be brought to engage behind and interlock with the first guiding and retaining mouldings, and with at least one second locking cam which has a corresponding position and shape to the first locking cam and is connectable to the first locking hook.