The A9Q22425 is an Acti9 Vigi iC60 add-on residual current device (RCD) — a 4-pole, 25 A, 100 mA, Type A block that plugs directly onto the outgoing side of a compatible iC60 MCB. The 54 mm width (6 x 9 mm pitches) and 73.5 mm depth fit the standard Acti9 modular grid, and the bottom tunnel terminals accept up to 25 mm² rigid cable.
The 100 mA sensitivity and Type A waveform detection cover sinusoidal AC and pulsating DC earth faults — the standard choice for final circuits with electronics, VFDs, or single-phase rectified loads. The instantaneous trip (no intentional delay) means it clears a fault in under 300 ms, which is the default for socket-outlet and general-purpose circuits where selectivity with an upstream time-delayed RCD is designed in, not assumed. The 25 A rated current matches a 25 A MCB partner; the plug-in mechanical and electrical connection to the MCB means the assembly occupies the same DIN pitch as the breaker alone, saving a module width over a standalone RCD. Pollution degree 3 per IEC 60947-2 means the device is rated for the conductive-dust and occasional-condensation environment of a typical industrial panel — not just clean residential switchgear. The 6 kV impulse withstand voltage (Uimp) and 500 V rated insulation voltage (Ui) give headroom for 230/400 V networks with transient surges. The IP20 (body) and IP40 (modular enclosure) ratings are normal for enclosed distribution boards; no special sealing is needed inside the cabinet.
The A9Q22425 carries an Active lifecycle status from Schneider Electric. No cross-reference or substitute is needed — the part is the standard fit.