Insulator: This is the primary support structure, usually made of porcelain or polymer, providing electrical insulation and mechanical strength. It holds all the other components in place and keeps them safely away from ground and other conductive surfaces. Fuse Holder: This component securely holds the fuse link. It provides a reliable electrical connection to the fuse and allows for easy fuse replacement. Different designs exist, some with spring-loaded mechanisms for easier operation. Contacts: These are the metal parts that make the electrical connection between the fuse holder, the insulator, and the power lines. They need to be robust and corrosion-resistant to ensure reliable operation.