What this RCBO is and where it goes
The Siemens 5SU9354-7KK06 is a SENTRON RCBO — a residual-current-operated circuit breaker that combines overcurrent protection with ground-fault detection in a single 2-module-wide (36 mm) package.
At 36 mm wide (2 modular width units), it fits standard distribution boards. Supply can enter from top or bottom. IP20 rated once wired and installed in an enclosure.
Thermal derating and selectivity
At 40 °C it derates to 5.64 A; at 45 °C to 5.46 A; at 50 °C to 5.22 A; at 55 °C to 4.86 A. If the panel runs hot, size the circuit accordingly — the C-curve magnetic trip threshold (5–10× In) shifts with the thermal element. Pollution degree 2, overvoltage category III.
Current production lifecycle — no end-of-life notification. This is an active Siemens SENTRON catalog line.