What this MCCB carries and where it fits
The Siemens SENTRON 3VA2225-6KP32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with an ETU850 electronic trip unit that provides adjustable overload and short-circuit protection for line (feeder) duty. Its interrupting capacity hits 242 kA at 240 V AC and 187 kA at 415/440 V, dropping to 121 kA at 500 V and 6 kA at 690 V — numbers that tell you this breaker is sized for high-fault industrial distribution panels, not branch circuits. The built-in undervoltage release (UVR) trips the breaker when supply voltage drops below a set threshold, a standard requirement for safety circuits in machine-tool and conveyor applications.
Thermal derating and enclosure planning
The 250 A rating holds flat up to 50 °C ambient, then derates to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If your panel internal ambient runs above 50 °C — common in sealed, sun-exposed or high-density enclosures — you need to account for that drop. The breaker dissipates up to 50.5 W max, so forced ventilation or spacing from heat-sensitive components is worth checking. Dimensions are 181 mm height, 105 mm width, 86 mm depth; it mounts on a standard DIN rail or directly to a backplate via the SENTRON 3VA mounting base.
What the ETU850 release gives you
The ETU850 is an electronic trip unit with communication function and other measurement functions — it can report load current, trip event logs, and support remote monitoring via the SENTRON communication bus. That makes it a fit for facilities moving toward digital energy management or predictive maintenance. The breaker does not include a ground-fault monitoring module (that would be a separate add-on), and there is no phase-failure detection built into the trip unit itself. The auxiliary contact version is listed as 'without', so if you need status feedback, plan on a separate auxiliary switch block.