The Siemens 5SU9346-7CR63 is a combined residual current circuit breaker with overcurrent protection (RCBO) in a single module width. It provides both earth leakage and short-circuit/overload protection for a single-phase final subcircuit. The 6 kA breaking capacity (Icn) at 230 V AC suits domestic and light commercial distribution boards where the prospective fault current stays under that threshold. The Type A residual-current detection handles pulsating DC faults and sinusoidal AC — covers modern electronics and switched-mode power supplies common in lighting and appliance circuits.
What the ratings mean for fit
The C-curve (C-Char) trips between 5 and 10 times rated current, so a 63 A unit will hold motor inrush or capacitive loads that draw up to roughly 630 A momentarily. The 30 mA residual sensitivity is the standard for personal protection against electric shock in socket-outlet circuits per IEC 60364. The 1P+N format switches the phase only and breaks the neutral without switching it — typical for single-phase final circuits in TN or TT earthing systems. Snaps onto standard DIN rail in a consumer unit or sub-distribution board.