What the ratings mean for fit
The 5SU9346-7CN25 is a single-module RCBO (residual current circuit breaker with overcurrent protection) that combines a 25 A C-curve MCB and a 30 mA Type A RCD in one 1P+N unit. The 6 kA breaking capacity (Icn) at 230 V AC covers the majority of domestic and light commercial final subcircuits where the prospective short-circuit current stays under that threshold. Type A detection handles pulsating DC fault currents from electronics and rectified loads — think LED drivers, variable-speed pumps, or washing machine controllers — which a plain Type AC RCD might miss. The C-curve (5–10× In magnetic trip) suits motor and compressor starts without nuisance tripping, while the 30 mA rating provides personnel protection for socket-outlet circuits.
Panel integration
Snaps onto standard 35 mm DIN rail in a consumer unit or distribution board. The 1P+N form factor occupies a single module width — no wasted space when wiring a lighting or general-purpose final circuit. Terminals accept up to 25 mm² conductor, which is generous for a 25 A device and makes looping through downstream MCBs clean.