An elastomeric protective cover for use with an electrical switch of the type including a movable actuator, such as a rocker switch. A housing region of the protective cover defines an interior cavity for sealing and receiving a portion of the movable actuator of the switch. An interior surface of the cavity includes a projection such as a reinforcing rib which is positionable above the movable actuator. The projection coacts with the surface of the actuator upon application of tactile pressure near the engaging means which deforms the cover. The cover which is made from a flexibly resilient material returns to its original shape upon removal of the tactile pressure. The cover includes a flange for mounting the cover to the outside of a panel or other surface.