The A9Q11425 is a 4-pole add-on residual current device (RCD) from the Acti9 Vigi iC60 range, rated 25 A with 30 mA earth-leakage sensitivity. It clips onto the DIN rail alongside the matching iC60 MCB, plugging in to create a combined RCBO assembly. The 30 mA sensitivity covers socket-outlet and general-purpose circuits where personnel protection is required — instantaneous trip, no intentional delay.
The 25 A rated current matches a 25 A MCB upstream, so the RCD won't thermally limit the circuit before the breaker does.
Clip-on mounting on standard DIN rail, 6 x 9 mm pitch wide — that's 54 mm total width. The tunnel-type terminals on the bottom accept 1...25 mm² rigid or 1...16 mm² flexible cable, stripped 14 mm, torqued to 2 N.m. IP20 body, IP40 inside a modular enclosure — fine for dry indoor panels, not for washdown zones. The bottom busbar compatibility means you can daisy-chain the neutral and phase feeds across multiple RCDs in the same row.