Derating and thermal reality
The 400 A rating holds flat up to 50 °C ambient. Above that, the derating is gradual: 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, 360 A at 70 °C. That's a 10 % drop from 50 to 70 °C — typical for a molded-case frame of this size.
The UVR is a common safety requirement: if control power drops, the breaker opens. No voltage trigger, no shunt trip. The auxiliary switches are wired into the panel's status monitoring. The basic switch itself is the 3VA2440-6HL32-0AA0.