Abstract: A plunger operated switch has a pair of movable contacts on a movable contact carrier bridged by a secondary contact supported on a pushbutton operator member which is biased apart from the contact carrier. Depression of the pushbutton operator for the plunger assembly moves the primary movable contacts into bridging engagement with the stationary contacts through the secondary contact member. In the event the primary movable contacts weld to the stationary contacts and an operating force is removed from the plunger operator, a spring biases the secondary contact away from the primary movable contacts to open the bridging relationship therebetween and open the circuit controlled by the switch. A pair of normally closed contacts are arranged for operation by the pushbutton operator so that the contacts open before the main contacts close and close after the main contacts open, rendering them particularly suitable for use as dynamic braking contacts in a motor control application.

Abstract: A double pole, double throw rocking contactor switch is operable as a reversing switch by particularly configured stationary contacts at the corresponding ends of the respective poles. Stationary contacts are formed electrically common out of a single member having the stationary contact of one pole formed to be disposed below the rocking contactor and the stationary contact of the other pole formed to be disposed above its respective contactor. Accordingly, one contactor engages the upper surface of a stationary contact while the other end of the other contactor engages the under surface of the opposite stationary contact for a given stable position of the actuator, thereby causing the respective contactors to engage stationary contacts at respective opposite ends of the contactors, accomplishing the reversing function internally of the switch without special cross connect conductors, thereby permitting press-in wire terminations to be utilized.

Abstract: An actuator pivotally mounted within a switch housing has cantilevered side members positioned in blocking alignment with projections on interior side surfaces of the housing to prevent movement of the actuator from an OFF position to an ON position. A removable operator has depending key portions which deflect the cantilevered side members inwardly to clear the projections when the operator is assembled to the actuator. The cantilevered side members engage inner surfaces of the projections when the operator is removed with the actuator in the ON position, permitting movement to the OFF position wherein the cantilevered side members return to the blocking position. A compression spring may be disposed between distal ends of the cantilevered side members to provide additional outward bias to the side members.