The Schneider Electric A9N19678 is an Acti9 DPN N Vigi RCBO — a combined overcurrent and earth-leakage circuit breaker in a single 1P+N module. It carries a 32 A rated current (B-curve) and a 300 mA Type AC residual-current trip, with a 6 kA breaking capacity at 230 V AC. That 300 mA sensitivity is the standard for general socket-outlet and distribution circuits where the primary concern is fire protection rather than personal shock protection (which would call for 30 mA). The B-curve means the magnetic trip operates between 3 and 5 times In — 96 to 160 A — so it's suited for resistive and general-purpose loads, not high-inrush motor or transformer circuits.
The 1P+N format occupies 4 x 9 mm pitches — 36 mm total width — leaving room for adjacent breakers or accessories in the same distribution board.
Designed to EN/IEC 61009-1 and EN/IEC 61009-2-1 for combined RCBOs. Tropicalisation class 2 per EN 61009 means it withstands 95 % relative humidity at 55 °C, so it's fine for non-conditioned enclosures in warm climates. Operating altitude limited to 2000 m; above that, derating applies.