Two positions: Off-On. For 6-36V DC systems. Disconnects battery circuit only. Electrical rating: 2000A intermittent. 30 seconds On, 3 minutes Off, 300A continuous. Mounting stem: 3/4-Inch -16 thread. Fits panels up to 1/4-Inch (6.4mm) thick. Terminals: Two 1/2-Inch -20 copper studs. Case: Plated steel. Sealing: sealed between shaft and mounting stem; case and terminal insulator.