Secure Battery Isolation 300A battery disconnect key actively prevents energy waste by fully isolating the battery when not in use, enabling safe system shutdown and helping extend battery life. Suitable for marine and RV setups. Versatile Compatibility Designed for electrical loads: 300A sustained, 1000A at 12 48V DC networks. The interlock ready mechanism allows single unit operation or synchronized multi key configurations. Sturdy Construction Chrome finished aluminum body protects internal components from corrosion and physical impact. Built for weather tolerance and stable performance in harsh conditions, making it a reliable choice for amperage battery systems that require failsafe disconnection. Ready to Install Package Includes 1 disconnect key, 1 faceplate, 2 rubber terminal insulators, 2 copper lugs (3/8 inch), and 2 heat shrink tubes. Complete kit for secure current battery isolation and terminal protection. Use scenarios Marine: isolate the battery when the boat is docked or unattended to prevent parasitic drain and ensure safe shutdown. RV and off grid applications: quickly disconnect the battery to protect against unintended discharge and extend battery life during storage or when not in use. current electrical systems: manage large 12 48V DC networks, with the option to deploy multiple units in sync using the interlock ready feature for coordinated disconnection.