This heavy-duty SPST relay harness system is engineered for reliable performance in automotive, marine, and other 12V DC applications. Rated for an impressive 40A current capacity, it features color-coded wires for foolproof installation and maintenance. The relay operates efficiently with a standard 12V input while consuming minimal power, making it ideal for various vehicle electrical systems. Built with premium silver alloy contacts that provide exceptional conductivity and a contact resistance of ≤100MΩ, this relay delivers consistent switching performance through 100,000 electrical operations. The robust sealed design functions reliably in temperatures from -55°F to 158°F and humidity levels between 35-80%. With fast response times - 15ms operation and 10ms release - it's perfect for time-critical applications. The compact form factor allows for flexible mounting options in tight spaces, while the included harness sockets ensure secure connections. This relay is an essential component for powering vehicle accessories, lighting systems, and other automotive electrical components that require reliable high-current switching.