Deployment context — where this part goes
The design is flagged for railway applications, which typically demands wider temperature range and vibration resistance — the -40 °C to 75 °C operating range confirms that.
Thermal derating — the real-world current limit
The 16 A rating holds at 35 °C. Above that, derate linearly: 15.23 A at 40 °C, 14.83 A at 45 °C, 14.43 A at 50 °C, 14 A at 55 °C, 13.57 A at 60 °C. If the panel ambient runs at 50 °C, the breaker's continuous current limit is 14.43 A — not 16 A. That's the number to put in the BOM load calculation.