This JD1912 automotive relay harness is a heavy-duty SPST (Single Pole Single Throw) solution for your vehicle's electrical needs. Operating at 12V DC with a robust 40A capacity, it's perfect for cars, trucks, vans, motorcycles, and boats. The relay features color-labeled wires for straightforward installation and troubleshooting. With its sealed design and durable silver alloy contacts, this relay delivers reliable performance in demanding conditions from -67°F to +158°F. The compact unit requires minimal power draw - just 150mA at standard 12V operation - while maintaining high sensitivity and contact voltage capabilities. Built for longevity, it boasts an impressive mechanical lifespan of 10 million operations and electrical durability of 100,000 cycles. The relay's high-quality construction includes excellent insulation resistance and impressive withstand voltage ratings between contacts (1000VAC) and between contact and coil (1500VAC). Its versatile design makes it ideal for various automotive applications where reliable switching of high-current circuits is required.