It is rated 40 A with 30 mA sensitivity, Type A-SI (super immunised), meaning it handles pulsed DC fault currents and resists nuisance tripping from high-frequency harmonics — a common need on VFD-fed or switched-mode loads. The 1P+N poles protect a single-phase circuit, and the voltage-independent trip mechanism operates even if the neutral is lost, which is a reliability advantage over electronic RCDs.
Mounts via clip-on onto a DIN rail and connects to the upstream MCB by screws. Neutral is on the left; tunnel terminals accept 1–16 mm² rigid or 1–10 mm² flexible cable, with a stripping length of 14 mm and a tightening torque of 2 N.m. IP20 on the device body, IP40 inside the modular enclosure — fine for dry indoor panels; not rated for washdown.
This is a standard catalogue item in the Acti9 range, broadly stocked across distribution.