The Siemens SENTRON 3VA1225-4EF32-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release designed for line protection. Its breaking capacity reaches 121 kA at 240 V AC and 75.6 kA at 415 V AC — figures that tell you it can interrupt high-fault currents on the secondary side of a distribution transformer or at a main panel feeder without cascading upstream. The TM240 release gives a fixed thermal pickup at 240 A and a magnetic trip calibrated for the breaker's frame size. For a cold-storage or ammonia refrigeration plant, the 250 A continuous rating at 40 °C ambient is the figure to size against the main feeder; the breaker holds that rating through 50 °C and only begins to derate above 55 °C, dropping to 223 A at 70 °C. That thermal stability matters when the MCCB lives in a warm electrical room adjacent to a freezer.
The interrupting rating drops as system voltage rises: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V (–). For a 480 V panel in a US installation, the relevant figure is the 440 V value (52.5 kA) — sufficient for most distribution boards with available fault current under that threshold. At 690 V the breaker still clears 11.9 kA, which covers many industrial motor-control-center applications in 690 V regions.
Depth of 70 mm leaves room behind a 200 mm deep enclosure for wiring and the shunt trip accessory.