What this 500 A MCCB does on the line
The Siemens SENTRON 3VA2450-5MN32-0AA0 is a 3-pole molded case circuit breaker rated for 500 A continuous current at 40 °C, and it holds that rating all the way up to 50 °C before it starts to derate — 495 A at 55 °C, 490 A at 60 °C, 485 A at 65 °C, 480 A at 70 °C. That thermal profile means you can run it near full nameplate in a warm panel without oversizing the frame. Breaking capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. The design is specifically for motor protection, with phase failure detection built in, no undervoltage release, and no ground-fault monitoring version.
Panel fit and power loss
Maximum power loss is 99 W, so plan for that heat in the enclosure: it's not a sealed-box part unless you've got ventilation or a bigger can.