Siemens 3VA2225-6JQ32-0BL0 SENTRON MCCB, 250 A, 242 kA at 24

The Siemens SENTRON 3VA2225-6JQ32-0BL0 is a 3-pole molded case circuit breaker rated for 250 A continuous current (Iu) across a 40–50 °C ambient range, with a slight derating curve above that — 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C — so you size the breaker for the panel's actual thermal environment, not just the nameplate. Breaking capacity hits 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 6 kA at 690 V — numbers that cover most industrial fault-current scenarios downstream of a large transformer or generator.