The Schneider Electric A9D37625 is an Acti9 iDPN Vigi residual-current circuit breaker with overcurrent protection (RCBO), combining a 25 A thermal-magnetic trip (C-curve, 5–10× In magnetic threshold) with integrated 30 mA earth-leakage protection in a single 1P+N module.
The 25 A rated current (In) governs the continuous load the RCBO can carry without tripping on thermal overload — sized for a 25 A feeder or final circuit. The 30 mA earth-leakage sensitivity provides personal protection against direct contact (30 mA is the standard threshold for shock protection per IEC 60364). The 10 kA Icn breaking capacity at 230–240 V AC 50 Hz tells you this RCBO can safely interrupt a fault current up to 10 kA without welding contacts or failing — that's the standard domestic/commercial rating for most European distribution boards; if your prospective fault current exceeds 10 kA, you need a current-limiting upstream device or a higher-rated breaker.
This is an outgoer device — it protects the final circuit, not the incoming supply. Clip it onto a DIN rail (EN 60715) inside an Acti9 enclosure or any standard modular distribution board. The 9 mm pitch between phase and neutral matches the Acti9 busbar system, so you can feed it from a common busbar without extra wiring.