500A NOARK Enclosed Moulded Case Circuit Breaker (MCCB), UL 489 listed, Ex9M4 series, 3-poles (3P3d), Rated current: 500A, Interrupting capacity: 50kA (600Vac), Lugs on both load and line sides (3-wires), Thermal-Magnetic (adjustable) (AT/AM (Adjustable Thermal / Adjustable Magnetic)), Trip unit: NEMA 12, equivalent to E12XNM4H500T3L