Siemens 3VA2163-6HL32-0DH0 — 63 A MCCB with Undervoltage Release
The Siemens SENTRON 3VA2163-6HL32-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. Per the datasheet, the breaking capacity sits at 242 kA at 240 V AC, dropping to 187 kA at 415 V and 440 V, then to 121 kA at 500 V, and finally 3.7 kA at 690 V.
The 63 A continuous rating is thermally rated — it holds at 40 °C, 45 °C, 50 °C, 55 °C, 60 °C, 65 °C, and 70 °C without adjustment. That means a panel running warm (say 55 °C internal ambient) still gets the full 63 A from this breaker. The minimum breaking current is 95 A, maximum 756 A — that's the range over which the internal trip mechanism operates within its calibrated curve. Below 95 A the breaker may not trip in a defined time; above 756 A it's in the instantaneous region.