This heavy-duty SPST relay harness 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 compact design incorporates premium silver alloy contacts with low contact resistance (≤100MΩ) for consistent switching performance. Built to last, this relay boasts 100,000 operations of electrical life and 10 million mechanical operations. Operating efficiently between -55°C to +70°C, it's ideal for challenging environments. The relay requires minimal power consumption while delivering high sensitivity and fast response times - 15ms operation and 10ms release. With a standard operating voltage of 12V (minimum 8V), this versatile relay is perfect for trucks, vans, boats, and motorcycles. The sealed construction and robust specifications ensure reliable performance in various applications, from power windows to auxiliary lighting systems. Each unit includes mounting hardware and is ready for immediate installation.