What this RCBO does in the panel
The Siemens 5SU1324-7FP13 is a 2-pole SENTRON RCBO — a combined residual-current and miniature circuit breaker — rated 13 A at 30 °C with a C-curve trip characteristic and 10 kA breaking capacity per EN 60898 (15 kA per IEC 60947-2). It protects a 230/240 V AC, 50 Hz single-phase circuit against overload, short-circuit, and earth leakage in one 36 mm-wide (2 MW) module. The C-curve (magnetic trip between 5× and 10× In) suits moderate inrush loads like small motors, pumps, and lighting banks where you need nuisance-trip immunity without sacrificing fault clearance speed. The 10 kA SCCR at 230/240 V covers most commercial and light-industrial distribution boards; the 15 kA IEC 60947-2 rating gives headroom for higher-fault installations where the utility transformer sits close.
Thermal derating — the real-world rating
The 13 A rating holds only at 30 °C ambient inside the distribution board. At 40 °C the continuous current drops to 12.2 A; at 50 °C to 11.2 A; at 60 °C to 10.3 A; and at 70 °C to 9.3 A. If your panel runs warm — typical for a crowded enclosure near solar inverters or drive cabinets — size the upstream load to the derated figure, not the 30 °C label.
Mounting and integration
Snaps onto standard 35 mm DIN rail, occupies 2 modular width units (36 mm), and accepts supply from either top or bottom. The IP20 rating applies only when installed inside a distribution board with connected conductors — this is an enclosed-panel device, not a standalone enclosure. Mounting position is unrestricted, so it fits vertical or horizontal busbars.