What this 250 A MCCB carries
The Siemens SENTRON 3VA1225-5GF42-0CC0 is a 4-pole molded case circuit breaker rated for 250 A continuous at 40 °C, with the same 250 A hold up through 50 °C before derating begins — 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, 223 A at 70 °C. That thermal curve means it can sit in a warm panel without losing headroom until the ambient crosses 50 °C. Interrupting capacity is 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — so it handles high-fault utility feeds at low voltage and still clears substantial faults at 690 V.
The 70 mm depth keeps it within typical gland-plate clearance on a 200 mm deep cabinet.