This 5 Pack of 4-PIN 40/30 AMP 12V DC Automotive Relays is designed for reliable performance in demanding electrical systems. Each relay features a heavy duty construction with 12 AWG tinned copper wires, which offers excellent corrosion resistance and ensures consistent conductivity over time. The 80 Ohm coil resistance and 1.8 watt power consumption provide efficient operation, while the minimum switching voltage of 6 volts DC allows for compatibility with a wide range of vehicle applications. Built for versatility, these relays function in an automatic operation mode and utilize a SPDT (Single Pole Double Throw) contact type. The quick connect terminals allow for straightforward installation, and the socket mount design secures the relay in place for stable performance. With a current rating of 40 amps for continuous use and 30 amps for the normally closed circuit, these relays are suitable for controlling accessories such as lights, pumps, fans, horns, and other 12V automotive components. The included waterproof relay harness adds an extra layer of protection against moisture, dust, and debris, making these units ideal for use in engine bays, off-road vehicles, marine environments, and other harsh conditions. The contact material is copper, ensuring reliable switching and long service life. Whether you are replacing worn-out relays or upgrading your electrical system, this 5 pack provides a dependable solution for your automotive or marine wiring needs.