- Secure Battery Isolation: This 300A battery disconnect key actively prevents energy waste by fully isolating the battery when not in use. Suitable for marine and RV applications, it delivers safe system shutdown and prolongs battery life through dependable circuit interruption. - Adaptable Fit: 300A continuous / 1000A intermittent rating for 12-48V DC circuits. Provides double deployment options: operate independently or interlock with companion units. - Sturdy Material: Chrome-finished aluminum body protects internal mechanisms from corrosion and physical impacts. Engineered for excellent weather tolerance and stable performance in aggressive conditions. A reliable choice for high-amperage battery systems requiring failsafe disconnection and enduring construction. - Ready-to-Install Set: Includes 1 disconnect key, 1 faceplate, 2 rubber terminal insulators, 2 good-quality 3/8-inch copper lugs, and 2 sturdy heat shrink tubes. Complete package for secure high-current battery isolation and terminal protection. - Use scenarios: On a boat or yacht to prevent battery drain during storage or long-term moorage; in an RV or off-grid trailer to isolate the battery when parked; in solar or fleet applications where interlock with companion units provides enhanced safety.