The Schneider Electric A9R74425 is an Acti9 iID residual current circuit breaker (RCCB) — 4 poles, rated 25 A, with 300 mA earth-leakage sensitivity. The 300 mA trip threshold suits general-purpose socket circuits and lighting feeders where a higher leakage tolerance is needed to avoid nuisance tripping on long cable runs or equipment with natural leakage.
If your line has VFDs, UPSs, or switched-mode supplies, you'd want Type A or Type B; this one is for straightforward AC distribution. Breaking capacity is listed as Idm 1500 A / Im 1500 A — that's the short-circuit withstand of the RCCB itself. It's not a high-fault device; upstream protection (MCB or fuse) must limit the prospective fault current to 1500 A or less. In practice, this pairs with a 16 A or 20 A MCB in a sub-distribution board. The 73.5 mm depth and 72 mm width mean it occupies 8 x 9 mm pitch modules on the DIN rail. That's standard 4-pole RCCB footprint — no surprises for panel layout.
Approvals: designed to EN/IEC 61008-1, which is the harmonized standard for RCCBs in Europe. The voltage-independent trip mechanism means it operates without an external power supply — it uses the fault current itself to trip, so it works even if the neutral is lost upstream.