This heavy-duty 500A battery cut off switch provides reliable power control for your vehicle's electrical system. Designed to handle high current loads from 12V to 36V, this master disconnect switch is ideal for cars, trucks, RVs, yachts, and boats. The fixed handle isolator features a convenient lock-out plate that prevents accidental reconnection during maintenance or storage, enhancing safety and security. Built with waterproof construction, this switch withstands harsh marine and automotive environments, protecting against moisture, spray, and corrosion. The robust design ensures dependable performance whether you're working on electrical repairs, preventing battery drain during extended storage, or adding an extra layer of theft deterrence. Installation is straightforward, and the switch serves as a direct replacement for part number 20247. The sturdy construction and high amperage rating make this an essential component for anyone needing to safely isolate their battery system. Perfect for mechanics, boat owners, and RV enthusiasts who demand reliable power management and want to extend battery life by eliminating parasitic drain.