What this MCCB carries and where it fits
The Siemens SENTRON 3VM1225-3ED32-0AA0 is a 3-pole molded case circuit breaker rated 250 A continuous at 40 °C, with a TM210 thermal-magnetic overcurrent release for line protection. It breaks 76 kA at 240 V AC and 53 kA at 415 V AC — numbers that tell you it handles high-fault utility feeds or transformer secondaries without cascading upstream. The 690 V AC operating voltage and 800 V rated insulation voltage cover most European and North American industrial panel voltages. At 70 mm deep × 105 mm wide × 158 mm high, it fits standard MCCB mounting footprints; the IP40 front means it's fine inside a closed panel but not for washdown areas. Max power loss of 57 W matters for enclosure thermal calculations — that's the heat you need to vent.
Thermal derating — the real continuous current
The 250 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 243.3 A, at 60 °C to 236.5 A, at 65 °C to 229.8 A, and at 70 °C to 223 A. If your panel ambient runs above 50 °C, size the load current against the derated value — not the nameplate 250 A. The storage range of -40 °C to 80 °C and operating range of -25 °C to 70 °C cover most indoor and outdoor enclosure conditions.
How it compares to the 3VA1112-5EE32-0AA0
The 3VA1112-5EE32-0AA0 is a smaller-frame MCCB — lower continuous rating and interrupting capacity. The 3VM1225-3ED32-0AA0 uses the TM210 release (thermal-magnetic, line protection) and is physically larger to handle 250 A and higher fault currents. If your panel was laid out for the 3VA1112, the 3VM1225 will not drop in without re-drilling the mounting and checking bus-bar spacing; the footprint and terminal centers differ. For a like-for-like swap at 250 A, this is the correct SENTRON frame.