300A Noark Enclosed Moulded Case Circuit Breaker (MCCB), UL 489 listed, Ex9M3 series, 3-poles (3P3d), Rated current: 300A, Neutral pole with 100% protection, Interrupting capacity: 25kA (600Vac), Lugs on both load and line sides (4-wires), Thermal-Magnetic (adjustable) (AT/AM (Adjustable Thermal / Adjustable Magnetic)), Trip unit: NEMA 12, equivalent to E123AM3N300T3L