RCBO rating and fit
The Siemens 5SU9353-7CR63 is a 1P+N residual current circuit breaker with overcurrent protection (RCBO) rated at 63 A, 30 mA residual sensitivity, Type A, C-characteristic, and a 4.5 kA breaking capacity at 230 V AC. Type A detection covers pulsating DC and AC residual currents — the common fault shape from rectified loads like switched-mode power supplies and variable-speed drives in a panel. The C-curve trips between 5 and 10 times rated current, sized for motor and lighting circuits with moderate inrush. The 4.5 kA Icn is the short-circuit breaking capacity at the rated voltage; for installations with higher prospective fault current upstream, verify the SCCR at the panel level.
Deployment context
The 5SU9353-7CR63 snaps onto DIN rail in a distribution board or sub-distribution panel. The 1P+N form factor occupies a single module width, so it fits standard enclosure fill patterns without crowding adjacent breakers.