What it is and where it fits
The Siemens 5SU9356-1KK10 is a SENTRON RCBO — a combined RCD and MCB in one 2-module-width (36 mm) package. It protects a single-phase final subcircuit against both earth leakage and overload/short-circuit, with the C-curve tripping characteristic meaning it holds 5–10× rated current for magnetic trips, suited to moderate inrush loads like small motors, pumps, and lighting banks. Rated 10 A at 30 °C, it derates to 9.4 A at 40 °C and 8.1 A at 55 °C — the thermal curve matters if the RCBO lives in a crowded enclosure or near heat sources. Breaking capacity is 6 kA per EN 60898 (the domestic standard) and 10 kA per IEC 60947-2 (the industrial standard), so it handles typical residential and light commercial fault levels without upstream coordination issues. Mounting position is any, and the supply can enter from top or bottom — no orientation restrictions during panel build. Installation depth is 70 mm, overall depth 77 mm, so it clears a standard 80 mm deep enclosure backplate.
Lifecycle and sourcing reality
No official successor has been announced for this order code. The SENTRON RCBO family is broadly stable; if a panel was specified around the 5SL6550-7BB, the 5SU9356-1KK10 shares the same 2-MW footprint and 1P+N topology but differs in breaking capacity and trip characteristic — verify the downstream load before substituting.
Integration and compliance notes
Snaps onto standard DIN rail (EN 60715) in any distribution board. Degree of pollution 2 and overvoltage category III suit fixed-installation final circuits. IP20 rating applies once the board is closed and conductors are connected — the RCBO itself is not touch-safe live. Halogen-free and silicon-free construction, so it meets clean-room and low-smoke requirements for data-center or medical-grade panels. Energy limitation class 3 means it limits let-through energy on short circuits — relevant for downstream equipment protection. Surge voltage resistance rated at 4 kV, surge current resistance 1 kA (8/20 μs waveform). Insulation voltage 264 V, operating voltage 230/240 V AC at 50/60 Hz. The test button requires a minimum of 195 V to function correctly.