On - Mom - Off. Self-grounding in metal panels. Contacts Open with plunger depressed, spring return to Ground. Single circuit. 3/8" -24 self tapping thread, mounting stem 7/32" (5.6mm) long. One blade terminal, plunger 5/16" long, self adjusting to 1/4" long. Operates with 6lbs (2.7 kg) minimum pressure. 3A at 12V DC. Replaces: GMC 9665205, 9839085, 20057138.