The 480 A frame size means the breaker's physical bus and contacts are rated for that maximum, but the ETU350 electronic trip unit is set for 40 A.
Breaking capacity is the real differentiator here. At 240 V AC this breaker interrupts 440 kA — that's utility-grade fault current, typical for large transformer secondaries or industrial service entrances. At 415 V and 440 V it still handles 330 kA, and at 500 V it's 220 kA. Even at 690 V it manages 52.5 kA. Those numbers mean you can place this MCCB on a high-fault bus without worrying about cascading failure upstream.
That's a standard SENTRON 3VA footprint — it bolts into the same mounting pattern as other 3VA frame breakers. Power loss is only 1.2 W at rated load, so heat buildup in a dense panel is minimal.