Safety interlock switching device for protecting equipment

Safety interlock switching device for protecting equipment, in particular in current conducting equipment, wherein a given protection device (5), normally closed during dangerous operation condition and opened during non-dangerous operating condition, the switching device comprising a housing, a toggle lever (14, 15) provided with a pivotable locking lever (8) pivotable between two dead center positions;

• an actuating element (9) stationarily mounted on said protection device, said locking lever cooperating with said actuating element, switch means connected to and cooperating with said toggle lever, said actuating element and said locking lever being provided with locking means cooperating with each other so that in one dead center position of the toggle lever (14, 15) the locking lever (8) and the actuating element (9) interlock with each other and the dangerous operating condition may be switched on by said switch means and in the other dead center position the dangerous operating condition is switched off by said switch means thus releasing the actuating element (9) and the protection device (5) therewith, said toggle lever and said switch means being disposed in said housing which is closed and is not accessible from the outside, said housing being provided with an insertion opening for inserting the actuating element (9) into said housing.