This heavy-duty 12V 200A battery isolator relay is an essential component for managing dual battery systems in vehicles and equipment. Designed to handle high current loads up to 200 amps continuously, this universal relay provides reliable switching and isolation for demanding automotive and marine applications. The 4-pin configuration follows standard relay wiring with terminals 30, 86, 85, and 87 clearly marked on the housing, making installation straightforward for both professional mechanics and DIY enthusiasts. The compact design measures approximately 2 inches in length and features a durable black housing with a convenient mounting bracket for secure installation in tight engine compartments. Heavy-gauge copper terminals with zinc-plated hardware ensure excellent electrical conductivity and corrosion resistance. This relay is ideal for dual battery setups, winch installations, high-power audio systems, and other applications requiring dependable high-current switching. The relay's robust construction can withstand the vibrations and temperature fluctuations common in automotive environments, ensuring long-lasting performance and peace of mind.