This Universal Battery Switch Relay is a heavy-duty, high-performance component designed for automotive and general-purpose dual battery systems. Available in 12V or 24V configurations with selectable current ratings of 100A or 200A, this versatile relay is built to handle demanding high-power starting and switching applications with ease. The normally open, 4-pin contact design ensures straightforward integration into a wide range of vehicles and setups. Constructed with a durable nylon shell and a brass inner core, this relay delivers long-lasting conductivity and excellent heat resistance under continuous use. The sealed protective housing guards internal components against moisture, dust, and debris, making it well-suited for under-hood and other challenging environments. Whether you are managing dual battery isolation, high-current switching, or auxiliary power control, this relay provides a reliable and robust solution. Its compact, universal design makes installation straightforward for both professional mechanics and DIY enthusiasts alike.