A bi-metallic lug is designed to establish a secure electrical connection between two different conductors: mostly aluminum and copper. Aluminum cables are connected to the copper busbars or terminals in several electrical systems. Direct connection of the two metals results in galvanic corrosion owing to their different electrochemical properties. Such corrosion weakens the connectio... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php