The Siemens SENTRON 5SY4116-6CC is a 1-pole miniature circuit breaker rated 16 A with a B tripping characteristic, breaking 10 kA per EN 60898. IP20 with conductors connected, so it lives inside a closed panel, not on the wet side of the enclosure.
Thermal derating and environmental limits
Rated 16 A at 35 °C ambient, but that drops to 14.7 A at 40 °C, 14 A at 45 °C, and 13.26 A at 50 °C. At 55 °C it's down to 12.5 A. The breaker itself survives -40 °C to 75 °C ambient, but the carrying current is what governs the circuit. Humidity limits: 95% RH up to 55 °C, then 55% RH up to 70 °C, then 35% RH up to 75 °C. That's typical for a sealed distribution board — no condensation inside.