This heavy-duty SPST relay harness features color-labeled wires for straightforward installation and reliable operation in automotive applications. Rated for 40A at 12VDC, it's ideal for trucks, vans, motorcycles, and boats. The compact design incorporates high-quality Ag alloy contacts with low contact resistance (≤100MΩ), ensuring consistent performance. Operating with a minimum voltage of 8V and standard voltage of 12V, this relay delivers excellent sensitivity while maintaining low power consumption. It boasts impressive durability with 100,000 electrical operations and 10,000,000 mechanical operations lifespan. The relay functions effectively across temperatures from -55°C to +70°C, making it suitable for demanding environments. With a rapid operate time of 15ms and release time of 10ms, it provides quick response when needed. The sealed protective design and robust construction make it a reliable choice for various automotive switching applications. Each unit comes with clear installation guidelines and all necessary mounting hardware.