What this MCCB is and where it fits
The Siemens 3VA2225-6JQ32-0AE0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in industrial power distribution. It carries 250 A continuously at 40 °C (cites:) and breaks up to 187 kA at 415 V (cites:) — that's the interrupting capacity you need for high-fault panels downstream of a large transformer or a utility feed. Three poles, solid-state trip, and a communication function (cites:) let you tie it into a BMS or SCADA for remote monitoring. The 105 mm width and 181 mm height (cites:,) mean it fits standard SENTRON panel cutouts; depth is 86 mm (cites:).
Thermal derating and real-world current
This breaker holds 250 A flat from 40 °C up to 50 °C (cites:,). At 55 °C it derates to 238 A (cites:), at 60 °C to 225 A (cites:), at 65 °C to 213 A (cites:), and at 70 °C to 200 A (cites:). If your panel is in a hot machine room or near a furnace, size the load accordingly — the 250 A nameplate only applies when ambient stays at or below 50 °C. The maximum power loss is 48 W (cites:), so ventilation in the enclosure matters; don't bury it in a sealed box without airflow.
Breaking capacity across voltages
The interrupting rating changes with system voltage: 242 kA at 240 V (cites:), 187 kA at 415 V and 440 V (cites:,), 121 kA at 500 V (cites:), and 4.5 kA at 690 V (cites:). For a 480 V panel you're looking at 187 kA — that's plenty for most industrial services. The 690 V rating drops to 4.5 kA, so if you're on a 690 V system verify the available fault current stays below that.