The Siemens SENTRON 3VA1225-5EF42-0AG0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a rated continuous current Iu of 250 A. The interrupting ratings are 187 kA at 240 V AC and 121 kA at 415 V AC, so it can safely clear high-fault currents on industrial distribution without upstream cascading.
Current-carrying capacity across temperature
Full 250 A rating holds from 40 °C up to 50 °C ambient. Above that, the thermal trip curve derates: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C.
Dimensions are 140 mm wide × 158 mm high × 70 mm deep. That 140 mm width is standard for a 4-pole MCCB in the 3VA frame — it needs a 4-module cutout on the DIN rail or mounting plate.
Auxiliary contacts and release configuration
The auxiliary contacts are useful for remote status indication or interlocking; the trip alarm signals that the breaker has opened on a fault.