Abstract:
A plurality of modular contact units are adapted for attachment to a housing containing an operating means which may be of either the push-button or selector switch variety. Each contact unit comprises a single pair of contacts and indicating means to display the condition of the pair of contacts. Camming means may be interchangeably attached to the operating means externally of the switch units. Selector switch operation provides maintained switching for up to eight positions, momentary switching, or momentary-maintained switching. Selector switch cams may be double stacked to provide a maximum number of switching programs with a minimum number of parts. The operating means may be illuminated or non-illuminated and is adaptable for use as a pilot light or a push-to-test unit.