The Schneider Electric A9V14263 is the Vigi iC60 add-on residual current block for the Acti9 family — a voltage-independent RCD that clips onto the downstream side of an iC60 MCB to add earth-leakage protection. Rated 63 A continuous with 300 mA sensitivity, Type AC (trips on sinusoidal residual AC only). Two-pole version, so it fits single-phase or split-phase outgoing circuits. Mounts via clip-on onto DIN rail, 4 module pitches wide (72 mm). The outgoer position means it sits after the MCB on the load side, catching leakage downstream. Voltage-independent tripping technology means the RCD doesn't need an external power supply or the line voltage to open on a fault — it uses the leakage current's own energy to trip. That's a reliability edge on circuits where losing the neutral could otherwise blind a powered RCD.
63 A rated current (In) — sized for a 63 A or smaller MCB upstream. The RCD must be matched to or exceed the breaker rating; this block mates directly with the iC60 range up to 63 A. 300 mA sensitivity is the standard for fire protection (not personnel shock protection, which requires 30 mA or lower) — common on distribution sub-mains, lighting circuits, or equipment where nuisance tripping from normal leakage would be a problem at 30 mA. Type AC earth-leakage protection — responds to sinusoidal AC residual currents only. That's the basic type, fine for resistive loads and general-purpose circuits with no electronics or DC components. If the downstream equipment has rectifiers, VFDs, or switched-mode supplies, you'd need Type A or Type F instead. Instantaneous trip, no intentional delay — so it clears fast but can nuisance-trip on inrush or transient leakage if the circuit has high capacitive coupling. Rated insulation voltage (Ui) 500 V AC, impulse withstand (Uimp) 6 kV — standard for distribution boards in industrial and commercial buildings.
No cross-reference needed — it's the active part.