The Schneider Electric A9W35363 is an Acti9 Vigi iC60 add-on residual current device — 3 poles, rated 63 A, with a 300 mA earth-leakage sensitivity. It clips onto the outgoing side of an iC60 MCB via the screw connection, adding RCD protection to that circuit without replacing the breaker. The Type A-SI (Super Immunised) classification means it handles pulsed DC fault currents from electronics (VSDs, UPS, LED drivers) that would desensitize a standard Type A, while the selective time delay (short intentional delay) coordinates with downstream RCDs so only the faulted subcircuit trips — critical for a distribution board feeding multiple loads where nuisance tripping on a main RCD shuts the whole panel.
63 A rated current matches the iC60 breaker it pairs with — the RCD does not increase the circuit ampacity, it just adds leakage detection. The 300 mA sensitivity is typical for main or submain protection where a 30 mA unit would nuisance-trip on normal cable leakage. Selective (S-type) delay gives about 40–150 ms inertia, letting downstream 30 mA RCDs clear first. Voltage-independent tripping means it operates even if the neutral is lost — the fault energy itself triggers the mechanism, no auxiliary supply needed. The 400 V AC rated operational voltage (per EN 61009-1) covers 3-phase 4-wire networks up to 415 V line-to-line.
Clip-on mounting to DIN rail, 7 x 9 mm pitches wide (117 mm). The tunnel-type terminals accept up to 35 mm² rigid or 25 mm² flexible cable, with a 3.5 N.m tightening torque and 14 mm strip length. The trip indicator gives local visual confirmation of a leakage trip, which speeds troubleshooting on a multi-circuit panel.