Bimetallic lugs are electrical connectors that are specifically intended to connect aluminum conductors to copper busbars or terminals, essentially solving the problems that exist when connecting two dissimilar metals in power systems. Bimetallic lugs are usually composed of an aluminum barrel—where the aluminum cable is placed—and a copper palm, which is attached to the copper busbar... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php