UL 1077 is a safety standard developed by Underwriters Laboratories that focuses on the performance and safety of supplementary protectors. These devices are designed to provide overcurrent protection for electrical circuits, ensuring that they can safely interrupt excessive current flow to prevent hazards like fires or equipment damage. The standard outlines specific testing and performance criteria that manufacturers must meet to ensure their products are reliable and safe for use. Compliance with UL 1077 helps consumers and businesses identify quality supplementary protectors that adhere to recognized safety practices in the electrical industry.