Abstract: A plunger switch comprises a switch body housing a first contact element, a second contact element and an elongate plunger. The first contact element is partially housed in the switch body and extends out for operative communication with a circuit. The second contact element is movable along a longitudinal axis of the switch body and is aligned to contact the first contact element through movement. The elongate plunger is movable along the longitudinal axis of the switch body, and is able to be completely recessed in the switch body. Movement of the plunger in a first direction facilitates contact between the first and second contact elements. The contact elements contact at contact portions. At least a pair of the contact portions may have ridged surfaces that are oriented so as to have intersecting points at contact and configured to perform oxidation cleanup. At least a pair of the contact portions may include silver nitride.