What this 400 A SENTRON frame carries
Breaking capacity scales with system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. Current rating holds at 400 A from 40 °C through 50 °C ambient, then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. The 138 mm width is a standard 3-pole MCCB footprint for this frame class — it fits the same DIN-rail or mounting-plate cutout as other SENTRON 3VA breakers in the 400 A range, so a panel laid out for a 3VA2225-5JQ32-0AK0 will accept this unit without re-drilling the gland plate.
What's inside the box — auxiliary and release configuration
Max power loss is 98.5 W at rated load — that's the heat the breaker dumps into the enclosure. For a panel with multiple breakers ganged together, that figure drives the ventilation or derating calculation; don't bury it in a sealed box without accounting for the thermal rise. The basic switch (the bare breaker without accessories) is order code 3VA2340-6JQ32-0AA0 — useful if you're comparing a bare unit against this fully-populated variant to see what the UVR and aux switch package adds to the BOM line.
Environmental and operating range
The 70 °C operating max matches the top end of the derating curve, so the thermal limit is consistent.