Panamax SEP200 Whole-Home Service Entrance Surge Protector rated For Split/single Phase Panels Up To 400a 3 Wires Plus Ground meets Ansi C62.41 Requirements 700v L-n/800v N-g Voltage Protection Rating Ul 1449 3rd Edition AC surge protector permanently connected to main service panel Features a compact chassis, visible diagnostic LED and easy installation. Rated for split/single phase panels up to 400 Amps Meets ANSI C62.41 Requirements. 700V L-N / 800V N-G Voltage Protection Rating, UL 1449 3rd Edition