Rated 25 A and 30 mA earth-leakage sensitivity, it handles the common residential or light-commercial single-phase load at 230 V AC, 50/60 Hz.
Type A-SI (Super Immunised) means it handles pulsed DC fault currents from electronics (rectifiers, VFDs, LED drivers) without nuisance tripping, while still detecting sinusoidal and pulsating AC faults. The voltage-independent tripping technology means it doesn't need an external power supply to detect leakage; it steals the fault energy from the line itself, so it still protects even if the neutral is lost upstream. Rated insulation voltage is 400 V AC and impulse withstand is 4 kV per EN/IEC 61009-2-1, so it's safe for a 230/400 V three-phase system even though it only switches one phase plus neutral. IP20 on the body, IP40 inside a modular enclosure. That's fine for a dry indoor distribution board; you wouldn't put this in a washdown zone without a sealed outer cabinet.
Width is 36 mm (2 x 9 mm pitches), height 95 mm, depth 74 mm. That's a standard two-module footprint on a DIN rail — it'll fit any enclosure sized for Acti9 gear. Tunnel-type terminals accept 1…16 mm² rigid or 1…10 mm² flexible copper; strip length 14 mm on the bottom connection. It connects to the upstream MCB via screws (the add-on residual current device format), so it's not a standalone RCBO — it requires a compatible Acti9 MCB bolted to its side. That's the Vigi iC40 design: a bolt-on RCD block that pairs with the iC40 line of MCBs.