Rated 25 A with 30 mA sensitivity, Type AC (sinusoidal AC residual currents only), it's the go-to for general-purpose socket circuits and lighting in residential or light commercial panels where you need a compact, modular RCD add-on rather than a full RCBO.
The 25 A rated current matches a standard 25 A MCB feeder for a lighting or socket circuit; the 30 mA sensitivity covers basic shock protection (30 mA is the standard threshold for personal protection against direct contact per IEC 60364). Type AC means it detects sinusoidal AC earth faults only — fine for resistive and inductive loads without power electronics, but not for pulsed DC or frequency-inverter-fed circuits. The voltage-independent tripping technology means it draws no auxiliary supply; the fault energy itself triggers the mechanism, so it works even if the neutral is lost upstream. Impulse withstand is 4 kV, pollution degree 3 — suitable for standard distribution panels in dry or normally damp environments. IP20 on the terminals, IP40 inside the modular enclosure: fine for enclosed panels, not for washdown.
Clip-on mounting onto DIN rail, 1P+N format (neutral on the left). Occupies two 9 mm pitches — 18 mm total width, 36 mm wide per the spec. The mechanical connection to the MCB is by screws: you bolt the Vigi iC40 to the outgoing side of the Acti9 MCB, sharing the busbar connection. Bottom tunnel terminals accept 1…16 mm² rigid or 1…10 mm² flexible; tighten to 2 N·m. Mechanical durability is rated at 20,000 cycles, electrical at 10,000 — plenty for a fixed installation, but not for daily switching duty.
It's an active line item in the Acti9 range, widely specified across European and Middle Eastern projects.