The A9W26463 is a Schneider Electric Acti9 Vigi iC60 add-on residual current device (RCD) — 4 poles, rated 63 A, with 500 mA earth-leakage sensitivity, Type A. It clips onto the side of a compatible iC60 MCB on a DIN rail, occupying 7 x 9 mm pitches (135 mm wide). The unit is voltage-independent: it trips on residual current alone, no auxiliary supply needed. That 500 mA sensitivity is typical for feeder or submain protection where a lower threshold would cause nuisance tripping from leakage in long cable runs or multiple loads.
The screw terminal tunnel accepts 1 to 35 mm² rigid or 1 to 25 mm² flexible cable; strip length is 14 mm, torque to 3.5 N·m. The unit is an outgoer device, meaning it sits downstream of the MCB in the distribution board. Pollution degree 3 (IEC 60947-2) means it's rated for the conductive-dust and humidity environment inside a standard industrial panel. IP20 on the body, IP40 inside a modular enclosure — so it's not for washdown areas, but fine inside a cabinet.
Rated operational voltage 230/415 V AC, 50/60 Hz, with insulation voltage 500 V AC and impulse withstand 6 kV. The instantaneous trip characteristic means no intentional delay — it clears a fault within the natural response time of the voltage-independent mechanism. The 8/20 µs impulse withstand of 250 A (per IEC 61009-1) confirms it survives surge events typical of AC mains without nuisance tripping.