The A9V26263 is an add-on residual current device (RCD) from the Schneider Acti9 Vigi iC60 family. It clips onto the downstream side of a compatible iC60 MCB to add earth-leakage protection to that circuit. Rated 63 A continuous, with a 500 mA trip sensitivity and Type A waveform detection, it catches sinusoidal AC faults plus pulsating DC faults up to 6 mA of smooth DC — the kind you get from single-phase rectifiers in VFDs, switching supplies, or dimmers. The trip is instantaneous — no intentional time delay — so it clears a ground fault as fast as the internal mechanics can move. That makes it a good fit for outgoing circuits where you want fast isolation of a live-to-ground fault, not selectivity with downstream RCDs. Mechanically it's a voltage-independent design: the trip coil draws its energy from the fault current itself, not from an external power supply. That means a lost neutral or a dropped control voltage won't disable the earth-leakage protection — it still trips on a live-to-ground fault as long as the phase conductor is energized.
Snap-on DIN-rail mounting, standard 9 mm pitch — this unit occupies 4 pitches (72 mm wide). The 73.5 mm depth leaves clearance for wiring in a standard enclosure; the 91 mm height fits under most distribution-board covers. Bottom terminals are tunnel-type, accepting one conductor per side: 1…35 mm² rigid, 1…25 mm² flexible (with or without ferrule). Strip length 14 mm, torque to 3.5 N·m. A comb busbar can feed the line side, which saves daisy-chaining wire when ganging multiple RCDs or MCBs on the same phase. IP20 on the body, IP40 inside a modular enclosure — standard for a panelboard device. Not a washdown part; keep it inside a dry cabinet.
Electrical ratings and standards
Insulation voltage 500 V AC, impulse withstand 6 kV per IEC 60947-2. Compliant with EN/IEC 61009-1 and EN/IEC 61009-2-1, the standards for RCBOs (combined MCB/RCD) and for RCDs intended to be used with MCBs. The impulse withstand rating on the residual-current side is 250 A, 8/20 µs waveform per IEC 61009-1 — it survives surge currents from nearby lightning or switching without nuisance tripping. Ambient operating range -25…60 °C; storage -40…85 °C.
If you're freezing a BOM or filling a line-down replacement, the A9V26263 is a straightforward fit. The 500 mA sensitivity and Type A characteristic are common choices for general-purpose final circuits; just confirm the upstream MCB's thermal-magnetic curve coordinates with the instantaneous RCD trip so you don't get nuisance openings on motor-start inrush or capacitor charging.