Secure Battery Isolation 300A battery disconnect key actively prevents energy waste by fully isolating the battery when not in use. Suitable for marine and RV applications, it provides safe system shutdown and helps extend battery life through dependable circuit interruption. Adaptable Fit 300A continuous / 1000A intermittent rating for 1248V DC circuits. Offers two deployment options: operate independently or interlock with companion units for flexible system configuration. Sturdy Material Chromefinished aluminum body protects internal mechanisms from corrosion and physical impacts. Weathertolerant design delivers stable performance in demanding conditions, making it well suited for amperage battery systems that require failsafe disconnection and durable construction. ReadytoInstall Set Includes 1 disconnect key, 1 faceplate, 2 rubber terminal insulators, 2 3/8inch copper lugs, and 2 heat shrink tubes. Complete package for secure current battery isolation and terminal protection. Use scenarios Marine applications: isolate the boat battery during stereo use or docked storage to prevent parasitic drain and protect electrical systems when the vessel is not in active use. RV and camper setups: quickly disconnect the house battery during longterm storage or when parking offgrid to avoid unwanted energy draw and simplify maintenance. Offgrid or solar installations: use in current battery banks to provide a reliable, safe disconnection point for service, testing, or safety shutdown during maintenance or emergencies.