The A9D43620 is a Schneider Electric Acti9 iDPN Vigi residual-current circuit breaker with overcurrent protection (RCBO) — one module wide, 1P+N, rated 20 A with a C-curve magnetic trip (5...10 x In) and integrated 300 mA earth-leakage protection. The 6 kA breaking capacity at 230...240 V AC, 50 Hz, conforming to EN/IEC 61009-2-1, is the standard domestic fault-clearing level across most of Europe; the C-curve means it handles moderate inrush from loads like small motors or lighting banks without nuisance tripping.
The 20 A rated current (In) and C-curve suit general-purpose final circuits feeding socket outlets, lighting, or small appliances — not heavy motor or welding loads. The 300 mA earth-leakage sensitivity is a protection level for fire prevention or equipment protection, not personal shock protection (that requires 30 mA or lower). The IP20 (finger-safe) and IP40 (enclosure) ratings mean it is protected against solid objects but not moisture — standard for indoor distribution boards.
Terminals accept 1...16 mm² rigid or 1...10 mm² flexible (with or without ferrule); strip 15 mm, tighten to 2 N.m. The 9 mm connection pitch between phase and neutral is standard for the Acti9 range, so it mates directly with busbars and adjacent devices without adaptors.