The Siemens SENTRON 3VA2225-6KQ32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with an ETU860 electronic trip unit. Its interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V, which means it can clear a fault upstream of a large distribution transformer without needing a current-limiting fuse ahead of it — the kind of SCCR headroom a site electrical engineer relies on for selectivity coordination in a main or feeder panel. The 800 V rated insulation voltage (Ui) confirms it's built for 690 V line-to-line systems where a standard 480 V MCCB would run out of dielectric margin.
Ratings and derating
The 250 A rating holds flat from 40 °C to 50 °C — no derating in a warm enclosure. Above that it drops linearly: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If the panel ambient runs above 50 °C, the continuous load must be capped accordingly. The interrupting curve is steep with voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. At 690 V it's still a usable breaker for a 690 V motor feeder, but the fault current must be verified to stay under 4.5 kA.
Integration notes
Mounts on a standard DIN rail or directly to a backplate. Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — fits a 3-pole MCCB footprint common across the SENTRON 3VA platform. Front-side IP40 means it's protected against tools and wires but not washdown; keep it inside a sealed enclosure if the panel sees hose-down cleaning. The optional motor drive (product extension) allows remote open/close, useful for a generator main breaker or an E-stop chain that needs to drop the feeder.