The Siemens 5SU9346-7CR20 is a combined residual current circuit breaker with overcurrent protection (RCBO) in a 1P+N form factor. It is rated Icn 6 kA, Type A sensitivity at 30 mA, C-characteristic tripping curve, rated current In 20 A, and rated voltage Un AC 230 V.
What the ratings mean for the panel
The 6 kA Icn (rated short-circuit capacity) means this RCBO can safely interrupt a fault current up to 6 kA at 230 V AC without needing an upstream backup fuse — adequate for most residential and light commercial final subcircuits where the prospective short-circuit current stays under that threshold. Type A residual current detection handles pulsating DC fault currents (typical from rectified loads like washing machines, LED drivers, or single-phase VFDs) in addition to sinusoidal AC. The 30 mA sensitivity provides additional protection against direct contact hazards per IEC 60364. C-curve (C-Char) means the magnetic trip operates at 5 to 10 times In (100–200 A for this 20 A unit), suited for circuits with moderate inrush — lighting banks, small motor loads, or capacitor switching — where a B-curve would nuisance-trip.