Main Battery CutOff Switch 48V 300A Car Battery Circuit Breaker Battery Isolator Switch Boat Battery Isolator Switch Marine Battery Isolator Disconnect Switch This main battery cutoff switch provides a reliable disconnect for 48V electrical systems. Rated at 300A, it functions as a battery isolator and disconnect switch with circuit breaker style protection, suitable for marine, automotive and other 48V installations. Key Benefits Quick, secure battery isolation to prevent parasitic drain and improve safety current capability up to 300A to handle heavy loads and robust electrical systems Acts as a main disconnect and circuit breaker to prevent backfeed during maintenance Suitable for 48V systems in cars, boats and marine equipment Simple manual operation offers reliable control when shutting off power Designed for use in marine and automotive contexts as a main battery cutoff Key Attributes Functionality: Main battery cutoff switch, battery isolator, disconnect switch with circuit breaker capability Voltage rating: 48V Current rating: 300A Applications: Car battery, boat battery, marine battery isolator disconnect Compatibility: 48V electrical systems requiring a primary disconnect Performance: Provides dependable power shutoff and protection for connected circuits Use Cases Marine vessels: Use as the main shutoff for the boat battery during docked periods or maintenance to prevent battery drain and reduce risk of electrical issues Automotive and trailers: Quick battery isolation for service, storage, or security when the vehicle is not in use Recreational vehicles and auxiliary systems: Isolate the main battery to protect auxiliary banks and prevent backfeed from charging equipment or solar arrays Note Based on the product title, this device is designed as a main battery cutoff switch with a 48V 300A specification, suitable for boat, marine, and automotive battery isolation needs. Material, exact mounting size and installation details are not provided in the title.