What the 250 A continuous rating means for your panel
The Siemens 3VA2325-5HL32-0AJ0 is a 3-pole SENTRON molded case circuit breaker rated for 250 A continuous current across the full ambient range from 40 °C to 70 °C — no derating curve to chase at elevated panel temps. That flat thermal behavior simplifies BOM calculations when the breaker sits near other heat sources in a crowded enclosure. Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — meaning this breaker handles high available fault current on 480 V or 600 V class distribution without needing a current-limiting fuse upstream. The 3 000 A maximum short-time rating supports selective coordination downstream.
Power loss is 37.5 W maximum, so account for that heat in the enclosure ventilation budget.