Door-contact switch, especially for motor vehicles

The invention relates to a door-contact switch having a switching pin or switching plunger (2), which can be displaced axially in the switch housing (1) against the pressure of a spring (3) and has a metal output terminal (7) which projects beyond the pin circumference at the sides and, in the switched-on position, rests against the housing base (4) in a metallically conductive connection. The switch housing (1) consists of an electrically non-conductive plastic, and an electrical conductor (8) consisting of a corrosion-resistant material, such as brass, copper or the like, extends on the switch housing (1) between the opening (10) for attachment to the vehicle frame or chassis and between the contact point for the output terminal (7) on the housing base (4). In addition, the switching pin or switching plunger (2) is sealed with respect to the inner wall (11) of the switch housing (1) by means of an internally-located sealing ring or a sealing disc (12) which preferably consists of sealing material which can slide and which ring or disc can be integrally injection-moulded on the plunger shaft (2a) and slides along the housing inner wall (11) when the switching pin (2) is operated. The sealing ring (12) can be constructed as a laminar seal having preferably two sealing lips (12a, 12b) which point radially outwards.