Protects against arc faults in wiring resulting from damaged insulation and other causes. Designed to recognize an arc fault and then quickly tripping to stop the flow of electricity to prevent the electrical system from starting a fire. Tamper resistant shutters. Large visual LED indicator light gives quick notification of tripped or end-of-life condition.Heavy duty thermoplastic construction. Tri-combo head terminal and mounting screws. Meets and exceeds 10ka short circuit testing and Underwriters Laboratories UL 1699A and UL 498 safety standards.