On - Mom - Off. Self-grounding in metal panels. Contacts Open with plunger depressed, spring return to Ground. Single circuit. 7/16" -20 thread mounting stem, 7/16" (11.1mm) long, two flats on stem for mounting in double-D hole. One blade terminal, plunger 33/64" (13.1mm) long. 5A at 12V DC.