In modern power infrastructure, it is usual to encounter the use of both copper and aluminum conductors simultaneously. For facilitating a corrosion-free and safe connection between disparate metals, bimetallic lugs are extensively used. Due to their efficiency in managing mixed-metal connections, they are found vital in all sorts of electrical installations.
1. Power Distribution... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php