The Siemens 5SU1654-0KK10 is a SENTRON 5SU1-series RCBO (residual current circuit breaker with overcurrent protection) rated 10 A with a B tripping characteristic and 10 kA breaking capacity per EN 60898.
The 10 A B-curve means it trips magnetically between 3 and 5 times rated current (30–50 A) for short circuits, and thermally at 1.13–1.45× In for overloads. Thermal derating is published from 30 °C upward: 10 A at 30 °C, 9.5 A at 40 °C, 9.3 A at 45 °C, 9 A at 50 °C, 8.7 A at 55 °C, 8.5 A at 60 °C, 8.2 A at 65 °C, and 8 A at 70 °C. If your distribution board runs hot — say 50 °C ambient — you're effectively working with a 9 A device, not 10 A. Wire range accepts 0.75 to 35 mm² solid or stranded, which covers everything from 1.5 mm² lighting circuits up to 10 mm² cooker or shower feeds.
Deployment context
Snaps onto DIN rail in a distribution board — 2 width units (36 mm). IP20 rating applies only when the board is installed with connected conductors, so it's not for exposed or outdoor mounting without an enclosure. Supply can enter from either top or bottom, which simplifies panel wiring.