What this MCCB carries and where it fits
The Siemens 3VA1225-4EF32-0DA0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current (Iu) with a TM240 thermal-magnetic release, configured for line protection across three poles. Its interrupting capacity hits 121 kA at 240 V, 75.6 kA at 415 V, 25 kA at 440 V, and 11.9 kA at 690 V — numbers that tell you it's sized for high-fault industrial distribution, not light commercial. The 250 A rating holds flat from 40 °C through 50 °C, then derates to 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C — so if your panel ambient runs above 50 °C, you lose about 11 % of capacity by 70 °C. This MCCB includes an undervoltage release (UVR) as the auxiliary release design, but ships without auxiliary contacts, communication functions, phase failure detection, or ground fault monitoring — it's a straight line-protection breaker with a UVR coil for safety circuits. The integrated auxiliary trip uses order code 3VA9608-0BB25; the front face carries IP40 protection, so it's fine inside a closed panel but not for washdown environments.
Panel fit and physical integration
Dimensions are 105 mm wide, 158 mm high, and 70 mm deep — a standard SENTRON 3VA frame size that mounts on a DIN rail or panel-mount plate in a typical industrial enclosure. Latching endurance is rated at 15 000 operations, which is typical for a distribution MCCB — not a switching duty cycle, but fine for infrequent manual isolation and fault clearing. Rated insulation voltage Ui is 800 V, and the reference code per DIN EN 81346-2 is Q (switching device).