Patent ID: 8138862

Claim:
An installation switching device having at least one pole current path comprising: two stationary contact pieces; a moving contact bridge including two moving contact pieces forming a double-break pole with the two stationary contact pieces; a contact pressure spring exerting a pressure on the moving contact bridge in a closing direction of the moving contact bridge: a pusher configured to act on the moving contact bridge counter to the pressure of the contact pressure spring in an opening direction, the pusher including a slide and a striking pin, each disposed moveably relative to the moving contact bridge and to one another in a movement direction of the moving contact bridge, the slide and striking pin having a frictional engagement with one another; a switch latch operable to activate an operating lever configured to act on the pusher against the pressure of the contact pressure spring; and an electromagnetic release having an impact armature wherein, in a short circuit event, the impact armature is configured to unlatch a latching point of the switch latch so as to initiate an activation of the switch latch and to strike the striking pin so as to move the contact bridge in the opening direction and move the slide, by a friction force corresponding to the frictional engagement with the striking pin, lagging behind the striking pin, before the operating lever permanently engages the slide so as to hold the contact bridge in the open position counter to the contact pressure force.