The Schneider Electric A9W31363 is an add-on residual current device (RCD) from the Acti9 Vigi iC60 range, designed to snap onto the side of an iC60 miniature circuit breaker (MCB) via the clip-on mounting. It provides earth-leakage protection for the downstream circuit, tripping the MCB when leakage exceeds the 30 mA threshold. The 63 A rated current matches the MCB it attaches to, so the pair handles the full load current of the circuit. The Type A-SI (Super Immunised) classification means it detects sinusoidal AC and pulsating DC residual currents, while being immune to nuisance tripping from high-frequency harmonics or transient surges — a requirement for circuits feeding electronic loads like VFDs, UPS systems, or IT equipment. The voltage-independent tripping technology ensures the RCD operates even if the line voltage is lost, which is a safety advantage over electronically dependent units.
The 117 mm width, 91 mm height, and 74 mm depth fit within the standard Acti9 modular enclosure footprint. The electrical connection to the MCB is via screws, so the assembly is mechanical and electrical — no extra wiring between the two devices. The IP20 rating (IP40 in modular enclosure) is suitable for dry indoor panel environments; pollution degree 3 per IEC 60947-2 covers the typical industrial panel atmosphere.
The device is designed and certified to IEC 61009-1 and EN 61009-1, the governing standards for residual current operated circuit breakers with integral overcurrent protection (RCBOs) — though this is an add-on RCD, not a combined unit, the standard applies to the residual current function. The 8/20 µs impulse withstand rating of 3000 A per IEC 61009-1 confirms it survives common surge events without damage. The local trip indicator provides visual confirmation of a residual current trip, aiding fault isolation.