The interrupting ratings climb to 121 kA at 240 V, 75.6 kA at 415 V, 25 kA at 440 V, and 11.9 kA at 690 V — those numbers tell you the fault-clearing capability at each voltage level, and the 415 V figure is the one most European 400 V distribution panels care about. It does not carry undervoltage release, phase failure detection, ground fault monitoring, or communication functions — it is a straightforward thermal-magnetic breaker with a voltage-trigger capability.
Thermal derating and endurance
Above that, it steps down: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. If your panel runs hot (e.g., inside a non-ventilated enclosure near transformers), use the 55 °C or 60 °C figure for sizing; the breaker will still carry load but at a reduced limit.
The 3VA1225-4EF32-0JC0 measures 70 mm deep, 105 mm wide, and 158 mm tall. The 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame — it occupies three 35 mm DIN-rail modules (3 x 35 mm). Depth of 70 mm means it will clear most standard enclosure backplates and gland plates, but check the busbar or cable entry clearance if you are retrofitting into a shallow panel.