What this MCCB does and the rating that matters
The Siemens SENTRON 3VA2463-5KP32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated 630 A continuous at 40 °C, with a breaking capacity of 187 kA at 240 V. That 187 kA at 240 V is the headline number for fault-clearing — it means this breaker can safely interrupt a fault current up to 187,000 A at that voltage without welding or exploding, which is critical for high-fault service entrances or large transformer secondaries. At 415 V and 440 V it still holds 121 kA, and at 690 V it drops to 9 kA, so the voltage-dependent rating is the one you size against your available fault current.
Thermal derating and panel fit
The 630 A rating is at 40 °C ambient; at 50 °C it derates to 570 A, at 60 °C to 510 A, and at 70 °C to 450 A. If this breaker sits in a hot enclosure — say next to transformers or drives — use the 50 °C or 60 °C column, not the 40 °C number. Dimensions are 248 mm tall, 138 mm wide, 110 mm deep, so it fits a standard MCCB slot in a SENTRON panelboard or a DIN-rail enclosure with the appropriate mounting adapter.