The Schneider Electric A9W24425 is an Acti9 Vigi iC60 add-on residual current device — 4 poles, rated 25 A, with 300 mA Type A earth-leakage sensitivity. Voltage-independent tripping means the RCD detects leakage even if the phase voltage collapses, which matters on circuits where a lost neutral could otherwise blind the protection.
Rated 25 A at 230/415 V AC, 50/60 Hz, 4-pole outgoing feeder. 300 mA sensitivity is instantaneous, suitable for fire or equipment protection. Type A detects pulsating DC residual currents. Rated insulation voltage 500 V AC and impulse withstand 6 kV per IEC 60947-2, with an 8/20 µs surge capacity of 250 A per IEC 61009-1. That means it holds up through standard distribution-level transients without nuisance tripping or internal flashover. Clip-on mounting to DIN rail, 6 module pitches wide (126 mm). IP20 on the device body, IP40 inside a modular enclosure — fine for dry indoor panels, not for washdown areas.
Designed and tested to IEC 61009-1 and EN 61009-1 — the harmonized standard for residual-current-operated circuit-breakers with integral overcurrent protection (though this is the add-on RCD module, not the combined breaker). The 8/20 µs impulse-withstand rating and the voltage-independent trip technology are both part of that standard's requirements.