It is a 2-pole unit rated at 63 A with 300 mA sensitivity, Type A protection, and selective (time-delayed) tripping, designed for 230/415 V AC 50/60 Hz networks.
The 63 A rated current (In) matches the upstream iC60 MCB it pairs with — this add-on block is sized for the same branch circuit, not oversized. Voltage-independent tripping means the RCD operates without needing a separate power supply — it uses the fault current itself to trip, so it stays functional even if the neutral is lost upstream. The 230/415 V AC operational voltage (Ue) suits standard three-phase four-wire systems where the RCD is connected line-to-neutral on a single phase. Clip-on mounting to DIN rail (4 module pitches wide, 72 mm) integrates directly into a standard distribution board alongside the iC60 MCB. The tunnel-type terminals accept up to 35 mm² rigid or 25 mm² flexible cable, and the tightening torque is 3.5 N.m — a solid connection for the 63 A rating.
The A9W25263 is certified to EN 61009-1 and IEC 61009-1 for RCBOs (combined MCB/RCD devices), and the insulation coordination meets IEC 60947-2 with pollution degree 3.