What this RCBO brings to the panel
The Siemens 5SU1324-6FM16 is a 2-pole RCBO from the SENTRON 5SU1 series, combining overcurrent protection and residual current detection in a single 3-module-wide (54 mm) package.
Temperature derating — the real current you get
The 16 A nameplate rating holds at 30 °C ambient. Above that, the RCBO derates linearly: 15.2 A at 40 °C, 14.88 A at 45 °C, 14.4 A at 50 °C, 13.92 A at 55 °C, 13.6 A at 60 °C, and 12.96 A at 65 °C, bottoming at 12.32 A at 70 °C. The derating curve above 55 °C is provided for reference but the device's published operating limit is 55 °C — running it above that ambient without a verified thermal analysis risks nuisance tripping or reduced service life.
IP20 applies once the distribution board is installed and conductors are connected — this is an enclosed-panel device, not a standalone outdoor unit.
Overvoltage category III and energy limiting class 3 place it in the permanent-mains installation tier. The product designation (RCBO) and design (instantaneous) mean it trips on fault without intentional delay — no selective or time-delayed variant here.