What this RCBO does on the rail
The Schneider A9D27220 is an Acti9 iC60 RCBO — a 2-pole residual-current circuit breaker with overcurrent protection, rated 20 A with a C-curve trip (5–10× In magnetic release) and 30 mA earth-leakage sensitivity. The 10 kA Icn (EN/IEC 61009-2-1) and 15 kA Icu (EN/IEC 60947-2) breaking capacity at 230 V AC 50 Hz means it clears both overload and short-circuit faults up to those levels without upstream coordination issues in most residential or light commercial panels.
Tightening torque 2 N·m, strip length 12 mm. The 78 mm depth leaves clearance in shallow enclosures; IP40 in a distribution enclosure, IP20 on the terminals.
