What is a membrane switch? A membrane switch is an operating system integrating key function, indicating element and instrument panel. The membrane switch, also called a membrane keyboard or membrane keypad, is a custom switch assembly that uses pressure to open or close the conducting path in an electrical circuit. The ultimate purpose of a membrane switch is to serve as the interface between man and machine, enabling an operator to communicate with a piece of equipment, instrument, or machinery. Membrane switches are still consistently utilized as user interfaces for a wide range of...