Its breaking capacity hits 220 kA at 240 V AC, 154 kA at 415 V, and 121 kA at 440 V — numbers that tell you it handles high-fault-current service entrances or large secondary substations without cascading upstream. At 500 V and 690 V the rating drops to 17 kA, so keep that in mind for 480 V delta or 600 V class systems: the 440 V figure is the one that governs most North American 480/277 V applications. Thermal derating is gradual: 50 A holds through 50 °C, drops to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Maximum power loss is 14.6 W, which is modest for a 50 A frame and won't cook a tightly packed enclosure.
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard SENTRON 3VA frame footprint. It bolts into a panel or mounts on a mounting plate; no DIN-rail clip on this MCCB class.