What this RCBO is and where it fits
The Siemens 5SU1324-7FA16 is a 2-pole RCBO from the SENTRON family — a combined residual-current and overcurrent protective device that fits a standard 3-module-width DIN-rail slot in a distribution board. It is rated 16 A with a C tripping curve, meaning it handles moderate inrush from motor or lighting loads without nuisance trips while still protecting against short circuits and overloads. The breaking capacity is 10 kA per EN 60898 and 20 kA per IEC 60947-2, giving you headroom for most residential and light commercial panels. IP20 protection applies once the board is installed with conductors connected; the housing is halogen-free and silicon-free, which matters for clean-room or sensitive-environment installs where outgassing is a concern.
Temperature derating and mounting
The 16 A rating is at 30 °C ambient. At 40 °C it derates to 15.2 A, at 50 °C to 14.4 A, and at 70 °C to 12.32 A — so in a hot panel or near a kiln control cabinet, size the upstream protection accordingly. Mounting position is any, and supply can enter from top or bottom, which simplifies wiring in tight enclosures. Depth is 77 mm, width 54 mm (3 MW), height 90 mm, with an installation depth of 70 mm — fits standard distribution boards without crowding.