The frame holds the same interrupting rating across the 400 A continuous band, so you don't lose headroom as load approaches the trip setting. No auxiliary switch is included on this order code; if you need remote status feedback, you'll add a separate auxiliary switch module.
The 400 A rating holds flat up to 50 °C. Above that, the frame derates in 25 A steps: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. At 98.5 W maximum power loss, ventilation in the enclosure matters; tight gutters with no airflow will push internal temperature past the 50 °C threshold.