Patent ID: 7980903

Claim:
An installation switch having an insulating housing and a terminal connecting arrangement for clamping a connecting conductor having an annular terminal shoe, the terminal connecting arrangement comprising: a terminal socket having an interior disposed between an insertion opening for receiving the terminal shoe and an access opening, the interior including a guide channel with an inner surface; a terminal screw, having a length which is less than the guide channel, comprising a screw head and a screw shank disposed in the interior of the terminal socket, the screw head having a guide surface that engages the inner surface of the guide channel such that the screw is actuatable in a longitudinal direction within the interior of the terminal socket between an open state and a clamped state; a connection plate having a screw hole with interior threads for threadably engaging the terminal screw when in the clamped state; and a retaining device formed by a section of the guide channel having a reduced cross section that is smaller than a cross section of the screw head corresponding to the guide surface such that preventing the terminal screw is unable to pass through the reduced cross section and be removed from the terminal socket when in the open state, wherein the open state provides a gap allowing the terminal shoe to be inserted into the insertion opening, the clamped state provides the screw shank being engaged with the terminal shoe, and wherein access to the terminal screw is provided via the access opening of the terminal socket to allow for actuation of the terminal screw.