The Siemens SENTRON 3VA2225-5HL42-0CA0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with an ETU320 electronic trip unit.
At 240 V the breaker clears 187 kA — that's the sort of SCCR you need at the service entrance or on a high-fault transformer secondary. At 415 V it still holds 121 kA, dropping to 79 kA at 500 V and 5.1 kA at 690 V.
Thermal derating and endurance
Rated 250 A up to 50 °C ambient; above that it derates linearly — 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. That's a 15 % drop from 50 to 70 °C, so if the panel runs hot, size the breaker for the actual ambient. Mechanical endurance is 20 000 operations, which is typical for a fixed-mount MCCB in distribution duty.
Auxiliary releases and trip unit
Maximum power dissipation is 50.5 W — account for that in the enclosure thermal calculation.