The Schneider Electric A9N19673 is a DPN N Vigi RCBO from the Acti9 range — a combined overcurrent and earth-leakage circuit breaker in a single 1P+N module. It protects a single pole plus neutral, with the neutral switched and on the left side of the unit. The 10 A rated current (at 30 °C) and B-curve (magnetic trip 3–5 × In) suit it for general-purpose distribution circuits feeding resistive and light inductive loads like lighting or socket outlets. The 300 mA Type AC earth-leakage sensitivity catches sinusoidal AC fault currents; it is the standard choice for basic shock protection in residential and commercial final circuits where no DC-sensitive or pulsed-current detection is required.
That is the standard domestic and light commercial fault level in most European installations; for industrial panels with higher prospective short-circuit currents you would step to a 10 kA or 15 kA device. The limitation class 3 (per EN 61009) means let-through energy is low enough to protect downstream wiring and loads without cascading — a useful detail for panel builders coordinating with upstream MCCBs.
That is the standard 1P+N modular footprint, so it fits directly into any Acti9 or Multi9 distribution board without re-spacing. The toggle gives clear ON/OFF indication, and the contact position indicator confirms the state even when the toggle is hidden behind a sealed cover.