The Schneider Electric A9N19647 is an Acti9 DPN Vigi RCBO — a combined overcurrent and earth-leakage device in a single 1P+N module. The 32 A rated current (at 30 °C) and C-curve magnetic trip (5–10 × In) make it suitable for general-purpose distribution circuits feeding resistive and moderate inductive loads like lighting, small appliances, or control transformers. The 300 mA earth-leakage sensitivity is an equipment-protection level, not a personnel-protection level (that would be 30 mA or lower), so it is intended for circuits where nuisance tripping from leakage in long cable runs or industrial equipment needs to be avoided while still providing ground-fault protection. The 6 kA breaking capacity at 230 V AC conforming to EN 61009 covers most domestic and light commercial panel fault levels; if your available fault current exceeds that, you need an upstream current-limiting device. The Type A-SI (Super Immunised) designation means the residual current device (RCD) element is designed to resist unwanted tripping from high-frequency leakage currents generated by VFDs, UPS systems, or switching power supplies — a common headache in panels with non-linear loads. Standard Type A RCDs can nuisance-trip on those waveforms; the SI variant filters them out, so you get reliable earth-leakage detection without the false alarms.
Tunnel-type terminals accept up to 16 mm² rigid or 10 mm² flexible cable, which is generous for a 32 A device and simplifies daisy-chaining in the panel. The toggle control gives a clear ON/OFF indication for local isolation. Ambient storage range is -40 to 60 °C, and it operates at altitudes up to 2000 m without derating.