Circuit breaker used on models: 300, 300P, 300HRC, 450, 450P, 450HRC-SS100, 500, 500P, 500HRC-SS100 (1998-2000),350P, 350HRC, 350PB, 350HRCB, 700, 700P, 700HRC, 725, 725P, 725HRC, 500CI, 750CI, 750CIHRC, 750P, 500A, 500AP, 500AHRC, 525, 525P, 525HRC, 525CI, 550, 550P, 550HRC, 550CI, 600, 600P, HT410