Keep your vehicle's electrical system running smoothly with this 4-pack of 5-pin switch relays, engineered for 12V DC automotive, truck, marine, and boat applications. Each relay is rated at 30/40 amps and 480 watts, delivering ample switching capacity for horns, headlights, fuel pumps, cooling fans, and other 12V accessories. The brass contacts provide durable conductivity and consistent performance under load, while the normally open contact type ensures reliable automatic operation. The plug-in connector design makes installation and replacement fast and straightforward, integrating seamlessly into existing wiring harnesses without the need for specialized tools. A secure screw mount option adds extra stability in demanding environments such as engine bays, boats, and trailers. Each relay features clearly labeled pins (85, 86, 87, 30) for easy identification and proper wiring. With a maximum switching current of 40 amps and a coil voltage of 12V DC, these relays are a dependable choice for a wide range of automotive and marine electrical upgrades or repairs. Four relays are included per order, giving you spares on hand whenever you need them.