Its interrupting capacity reaches 187 kA at 240 V and 121 kA at 415 V and 440 V, dropping to 75.6 kA at 500 V and 7.5 kA at 690 V — the 690 V figure is the one to watch if your system runs at that voltage; it's still adequate for most industrial service-entrance applications but coordination studies need to confirm selectivity at the lower end.
The breaker holds its full 400 A rating up to 50 °C ambient; above that it derates linearly to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. Dimensions are 248 mm high, 138 mm wide, 110 mm deep, which fits standard Siemens SENTRON mounting footprints; the 110 mm depth is shallow enough for most 400 mm deep enclosures without forcing a deeper can.
Auxiliaries and communication
It also includes a voltage trigger and a communication function — likely for remote monitoring or integration with a higher-level energy management system. No undervoltage release is fitted, so if your safety circuit requires UVR for machine isolation, you'll need to add it externally or spec a different variant.