This is a master battery disconnect switch typically used in race cars to let someone outside the vehicle turn off the electric power to the entire vehicle after a crash. It’s useful in an off-road vehicle or any vehicle for safety, and also for any vehicle that sits for long periods of time to stop slow battery drain. It is also an effective anti-theft device if the switch is hidden. Flaming River also makes a version of this with a removable key, and versions with levers and indicator lights.
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