It's the motor protection variant, rated for a continuous 250 A (Iu) across three poles, and carries an ETU350M electronic overcurrent release. This is the part you spec into a motor branch circuit when you need adjustable thermal-magnetic or electronic protection curves, not just a basic thermal breaker.
This MCCB interrupts 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V.
Thermal derating — the real-world current limit
Above 55 °C you start losing headroom: 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, 225 A at 70 °C.
Motor protection features and auxiliary wiring
The motor protection designation means the ETU350M release includes phase failure detection — critical for preventing single-phasing damage on a motor load. That gives you a dedicated signal for remote status and a separate alarm contact for the trip event, so you don't have to steal an auxiliary for the alarm. The basic switch assembly is order code 3VA2325-7MN32-0AA0; the integrated auxiliary trip module is 3VA9608-0BB11 — useful if you're stocking spares at the component level.
That's a standard 3VA3 frame footprint — it occupies the same mounting hole pattern and bus-bar spacing as other 3VA3 breakers in the 250 A class. If you're replacing a 3VA2225-5HN42-0BB0 or similar 3VA2 frame, check the depth: the 3VA3 is slightly deeper, so verify gland-plate clearance before assuming a drop-in swap.