This heavy-duty automotive relay is designed to handle high-current applications in your vehicle's electrical system. Rated for 40A at 12V or 24V DC, this normally open relay is ideal for controlling demanding circuits such as headlights, air conditioners, fuel pumps, and other high-power accessories. The relay features a waterproof and flame retardant construction that ensures reliable operation even in harsh automotive environments. Available in both 4-pin and 5-pin configurations (models JD1912, JD1914, JD2912, JD2914), this versatile relay comes complete with a wire harness socket featuring color-coded wires for easy installation. The compact design measures approximately 1.1 inches by 1.1 inches by 1 inch, making it easy to mount in tight spaces. With a coil power of just 1.7W and contact resistance of 50 milliohms or less, this relay provides efficient switching with minimal power loss. The insulation resistance exceeds 100 megohms, ensuring safe and dependable performance. Whether you're upgrading your vehicle's lighting system or replacing a worn relay, this durable component is built for long service life and consistent performance.