The Siemens 3VA2450-0MN32-0AA0 is a 3-pole SENTRON molded case circuit breaker rated for 500 A continuous current at 40 °C, holding that full rating through 50 °C before derating starts — at 55 °C it carries 495 A, at 60 °C it carries 490 A, at 65 °C it carries 485 A, and at 70 °C it carries 480 A. That thermal profile matters when you pack breakers into a warm enclosure; you don't lose headroom until the ambient hits 55 °C. The limited short-time rating is 6 kA for 1 s, which supports selective coordination downstream.
Dimensions are 138 mm wide, 248 mm high, 110 mm deep — a standard 3-pole MCCB footprint for the SENTRON 3VA2 frame. No undervoltage release or shunt trip fitted as-delivered; those are add-on accessories.