What it is and what it does
The Siemens SENTRON 5SU1354-1KK10 is a 1P+N RCBO — a combined residual-current device and miniature circuit breaker in a single 36 mm wide (2-module) housing. It protects a single-phase final subcircuit against overload, short-circuit, and earth leakage in one unit, saving a DIN-rail position versus separate RCD and MCB. Rated 10 A at 30 °C ambient with a Type C tripping characteristic (magnetic release between 5× and 10× In), it handles moderate inrush from motorized loads like small pumps or compressors without nuisance trips. The 10 kA breaking capacity per EN 60898 covers most domestic and light commercial distribution boards; the 20 kA rating per IEC 60947-2 gives additional fault-current headroom for industrial sub-distribution where the prospective short-circuit current is higher. The RCBO is instantaneous design — no intentional time delay on the residual-current element — so it trips within 40 ms on a ground fault. That makes it suitable for circuits where fast disconnection is required, but not for selective coordination with upstream time-delayed RCDs.
Mounting and integration
Snaps onto standard 35 mm DIN rail. The 36 mm width (2 modular units) matches the standard panel layout grid; leave the adjacent space clear for heat dissipation if the panel is densely packed. Supply can enter from top or bottom — no orientation restriction — and the mounting position is any, so horizontal or vertical rail orientation works. Installation depth is 70 mm plus the 77 mm overall depth, so the RCBO protrudes 77 mm from the rail. The IP20 rating applies once the distribution board is installed with conductors connected — meaning the front face is touch-safe, but the terminals are not protected against water ingress. Keep it inside a closed enclosure rated for the environment. The temperature derating curve is published: at 40 °C the continuous current drops to 9.5 A, at 50 °C to 9 A, and at 70 °C to 8 A. If the panel ambient runs hot, size the upstream protective device accordingly. The RCBO itself is rated for ambient from -40 °C to 75 °C.
Lifecycle and sourcing
For compliance documentation, the brand provides a CE declaration of conformity and the product is designed to EN 60898 and IEC 60947-2. Halogen-free and silicon-free construction is specified. Specific RoHS/REACH statements are available on request with the RFQ.