Siemens 3VA2163-7HN32-0HH0 — 63 A MCCB with ETU350 and 330 kA Interrupting Rating
At 240 V the breaker clears 330 kA; at 415 V and 440 V it holds at 242 kA, and at 500 V it still manages 187 kA. The sharp drop to 5.25 kA at 690 V tells you this frame is optimized for the 400–500 V range common in industrial distribution, not for 690 V motor circuits. If your BOM specifies 690 V service, this is not the variant for that rail.
Thermal Derating — 63 A Is Only Good to 50 °C Ambient
Above that it steps down: 60.6375 A at 55 °C, 58.275 A at 60 °C, 55.9125 A at 65 °C, and 53.55 A at 70 °C.