This JD1912 SPST relay harness is engineered for reliable performance in automotive, marine, and other 12V DC applications. Rated for an impressive 40A load capacity, it features color-labeled wires for straightforward installation and identification. The relay operates efficiently with a standard 12V input while consuming minimal power, making it ideal for various vehicle electrical systems. Its robust Ag alloy contacts provide dependable switching with low contact resistance of ≤100MΩ. Built for longevity, this relay boasts an electrical life expectancy of 100,000 operations and mechanical durability of 10 million cycles. The compact design operates across an extensive temperature range from -55°C to +70°C, suitable for demanding environments. With fast response times - 15ms operation and 10ms release - this relay delivers quick, reliable switching for critical automotive functions. The sealed construction and high-quality materials ensure consistent performance in varying humidity conditions, making it a dependable choice for trucks, vans, motorcycles, and boats.