The Siemens 5SU9346-1CR06 is a 4-pole (3P+N) RCD-operated circuit breaker — a combined residual-current device and MCB in one DIN-rail unit, 7 width units wide. It sits in a SENTRON distribution board protecting a final subcircuit against both overload/short-circuit and earth leakage (AC type fault current).
Temperature derating — the real-world current you can actually run
At 40 °C it derates to 5.3 A; at 45 °C to 5.2 A; at 50 °C to 4.9 A; at 55 °C to 4.6 A. The operating ambient range is -25 to +45 °C, so at 45 °C you are at the upper limit and the 5.2 A derating applies.
Terminal capacity and wiring constraints
Solid and stranded conductors both accept 0.75 to 35 mm² — a wide range that covers everything from 1.5 mm² lighting tails up to 10 mm² submains. The installation depth is 70 mm (the body depth is 77 mm including the front projection). Touch protection is built in per the design.
The product is halogen-free and silicon-free. IP20 protection with connected conductors in an installed distribution board. The DIN EN 61346-2 and 81346-2 function designation is F.