It's rated for 500 A continuous current, meaning it'll carry that load all day in a 40 °C enclosure without derating. The interrupting capacity is what you notice: 330 kA at 240 V, and still 242 kA at 415 V and 440 V. That's serious fault-clearing muscle for a motor control center fed off a high-capacity transformer.
At 55 °C it's 495 A, at 60 °C it's 490 A, at 65 °C it's 485 A, and at 70 °C it's 480 A. If your enclosure ambient runs hot, that's a clean derate curve to work with. That's a hard requirement for motor protection — a single-phased motor draws locked-rotor current on the remaining phases and cooks the winding if the breaker doesn't trip. This one does. Footprint is 138 mm wide, 248 mm tall, 110 mm deep. That's a standard 3-pole MCCB envelope for this current class — it'll fit Sentron panel cutouts and most MCC bucket layouts without re-drilling.
This is an active, in-production Siemens SENTRON catalog line. For a BOM-critical MCCB like this, you want to source it through a distributor who can quote firm pricing and lead time against an RFQ — not gamble on spot-market availability. We can do that: send the order code and quantity, and we'll come back with a quote and a delivery window.