Its breaking capacity reaches 75.6 kA at 240 V AC, stepping down to 52.5 kA at 415 V and 32 kA at 440 V — figures that define the fault-current headroom available for panel coordination studies.
Above that, the datasheet shows a gradual derating: 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. For a panel that runs warm — say, adjacent to drives or transformers — that 36 A floor at 70 °C is the figure to use for continuous load planning, not the 40 A nameplate.
This MCCB delivers 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V.
The 3-pole width of 76.2 mm (3 inches) is standard for this class of MCCB; verify the DIN-rail or mounting-plate spacing against the existing panel layout. The unit accepts bolt-on or plug-in connections per the SENTRON 3VA system, and the 70 mm depth leaves clearance for rear-access wiring in a typical 200 mm deep enclosure.