The Schneider Electric A9D61825 is an Acti9 iC60N RCBO — a residual current breaker with overcurrent protection, combining a 25 A thermal-magnetic MCB and a 30 mA earth-leakage module in one 18 mm wide unit.
Breaking capacity is 6000 A Icn at 230/240 V AC, 50/60 Hz. The 30 mA earth-leakage sensitivity covers personnel protection against indirect contact; combined with the TN earthing system this is the typical spec for a final subcircuit in a distribution board. The 25 A rating at 50 °C means you don't have to derate for a warm enclosure as long as ambient stays under that — common in a populated consumer unit or panel. Limitation class 3 means it lets through less energy than a class 1 or 2 device, so downstream equipment sees a smaller fault let-through — that matters for coordination with downstream SPDs or sensitive loads.
Mounting and wiring in the panel
Clip-on mount to DIN rail. Neutral on the left, which is the standard orientation for Acti9 RCBOs — make sure your busbar or pre-wired assembly respects that polarity. Strip 14 mm for the top connection, 13 mm for the bottom. IP20 finger-safe when installed in a closed panel. Padlockable with a 4 mm shackle for lockout/tagout.