Why Are High-quality Bimetallic Terminals Typically Made Of High-temperature Resistant Plastic?

In large electrical systems, bimetallic lugs is responsible for connecting the main conductors. Its internal metal part is usually composed of two different metals to optimize conductivity and mechanical properties. If ordinary plastic is used for the exterior of bi metal cable lug, it will soften, deform, or age at elevated temperatures, thus weakening the structural strength and insulation capacity of bi metal lugs connectors. High-temperature environments are common in distribution cabinets, frequency converter modules, motor terminal boxes, etc., where materials face not only heat conduction but also the coupling of thermal expansion, mechanical stress, and external chemical atmosphere.