The Siemens 5SU9356-7CR06 is a combined residual current circuit breaker with overcurrent protection (RCBO) in a single 1-module DIN-rail housing. It integrates a 6 A C-characteristic overcurrent trip with a 30 mA Type A residual current device, rated for 230 V AC single-phase circuits. The 6 kA rated short-circuit capacity (Icn) means it can safely interrupt a fault up to that level without upstream device coordination being required for the branch — standard for final subcircuits in commercial and residential distribution boards.
Rating so-what
The C-characteristic (6 A) provides a magnetic trip threshold of 5 to 10 times In, so it handles motor inrush and lighting ballast surges without nuisance tripping, while still clearing short-circuits fast. Type A residual detection covers pulsating DC fault currents — the kind generated by single-phase rectifiers in washing machines, LED drivers, and IT equipment — not just sinusoidal AC. The 30 mA sensitivity is the standard for personal protection against direct contact (IEC 60364).