Breaking capacity hits 121 kA at 240 V and 75.6 kA at 415 V, so it handles high-fault utility feeds without cascading upstream.
This MCCB delivers 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That spread covers most industrial supply voltages — the 415 V figure is what matters for a 400 V class panel in Europe or Asia; the 240 V figure suits North American 120/240 V services.
Rated 40 A from 40 °C to 50 °C ambient, then derates to 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. In a sealed panel running hot, you lose about 10 % of the rating. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — standard 3-pole MCCB footprint for DIN-rail or panel-mount integration.