Siemens SENTRON 5SU1654-0KK06 — RCBO for final-circuit protection
The Siemens 5SU1654-0KK06 is a 2-pole (1P+N) RCBO from the SENTRON family, combining overcurrent and residual current protection in a single 36 mm wide, 2-module-width unit. It is rated 6 A at 30 °C with a B tripping characteristic, and its breaking capacity is 10 kA per EN 60898 for general distribution or 35 kA per IEC 60947-2 for industrial panel applications — the higher figure gives selectivity headroom on high-fault utility feeds. The residual current element is type AC (sinusoidal only), instantaneous trip, suited for standard circuits with no DC components or smooth DC fault content.
The 6 A rating at 30 °C is the baseline; the part derates linearly to 5.7 A at 40 °C, 5.4 A at 50 °C, and 4.62 A at 70 °C. If the RCBO sits in a crowded enclosure or near heat sources, the 40 °C or 50 °C column is the one that governs the connected load — a 5.4 A continuous draw at 50 °C is the real limit, not the 30 °C number.
Installation depth is 70 mm, total depth 77 mm. The IP20 rating applies only when the distribution board is installed and conductors are connected — the front face is finger-safe but the terminals are not touch-proof until the enclosure door is closed.