fig1 and 3 is only represented at the left of the length axis l lugs 38 and 39 formed on ribs 37 engage in bores 40 of the floor part 2 a lower surrounding edge 41 of the floor part 2 forms a support for a circuit board which is not shown in greater detail with which the contact 4 7 can be coupled the contacts 4 7 lie protected within the edge 41 so that no particles from outside can get to the contacts 4 7 the manner in which the described push button switch operates is as follows in the 34 off 34 configuration depicted in fig1 and 2 the switch actuator 22 is pressed against a stop 42 by the return spring 33 the pressure springs 26 are relatively relaxed and the spring plunger 10 is urged by the pressure springs 26 against a stop 43 the pressure springs 11 12 press the contact bridges 8 9 against edges 44 defining the holes 15 the contact bridges 8 9 are thereby held away from the contacts 4 5 and 6 7 if the switch is to be switched then the switch actuator 22 is shoved in the.