NOARK Electric offers a complete range of 2 and 3 pole Molded Case Circuit Breakers in 6 frame sizes: M1 - 150 A, M2 - 250 A, M3 - 400 A, M4 - 600 A, M5 - 800A, and M6 - 1200A. Each frame size offers a range of interrupting voltage ratings from 240-690 Vac and 250-600 Vdc. The M series conforms to global standards that include UL 489, CSA C22.2 No 5.1 and IEC 60947-2.