The Siemens 5SU9336-7CN25 is a 1P+N RCBO combining overcurrent protection (C-characteristic, 25 A rated current) with residual current detection (Type A, 30 mA sensitivity) for 230 V AC circuits. The 6 kA rated short-circuit capacity (Icn) covers the majority of domestic and light commercial final circuits without needing an upstream backup fuse for fault clearance.
What the ratings mean for fit
The Type A residual current detection handles pulsating DC fault currents up to 6 mA smooth DC superimposed — essential for circuits with single-phase rectifiers, switched-mode power supplies, or LED drivers that can blind a Type AC device. The 30 mA sensitivity provides personal protection against direct contact (IEC 60364 threshold for supplementary protection). The C-characteristic (5–10× In magnetic trip) suits motor-starter, pump, and compressor loads where inrush current exceeds the B-curve threshold without nuisance tripping.
Panel integration
Single-module (1P+N) width on standard DIN rail; the neutral pole is switched and protected internally, so no separate neutral bar connection is needed downstream. The 6 kA Icn at 230 V AC aligns with typical domestic distribution board SCCR — no additional current-limiting fuse required for most installations.