The A9N19677 is a complete RCBO — overcurrent and earth-leakage protection in one 1P+N module. Rated 25 A at 30 °C with a B-curve magnetic trip (3...5 x In) and 300 mA Type AC residual current detection. Breaking capacity is 6 kA Icn at 230 V AC, 50/60 Hz, per EN/IEC 61009. No holes in the box — it ships ready for the DIN rail.
The 300 mA sensitivity is a fire-protection level, not personnel protection (30 mA would be required for that). B-curve trips at 3–5x In, suited for resistive and lighting loads with modest inrush; if your circuit feeds motor or transformer loads, a C-curve would be the better call.
Panel integration
Neutral is fixed left, line right. Operating altitude is 2000 m; derate above that. Ambient storage range is -40 to 60 °C.
