The Schneider Electric A9V31263 is an add-on residual current device (RCD) from the Acti9 Vigi iC60 range, designed to clip onto the line side of an iC60 MCB to form a combined RCBO assembly. It provides earth-leakage protection at 30 mA sensitivity (Type A-SI, Super Immunised) for 2-pole circuits rated up to 63 A, operating at 230-240 V AC 50/60 Hz. The 30 mA sensitivity covers personnel protection against direct contact (IEC 61009-1), while the A-SI classification means it resists nuisance tripping from high-frequency harmonics and transient surges common on modern electronic loads — switched-mode power supplies, VFDs, UPS equipment. The voltage-independent tripping mechanism (no external power needed to detect leakage) ensures protection even if the line voltage drops or fails.
Clip-on mounting to a standard DIN rail, occupying 4 module pitches (72 mm width). The 73.5 mm depth fits flush in a modular enclosure alongside the companion MCB. Bottom tunnel terminals accept 1 to 35 mm² rigid cable or 1 to 25 mm² flexible (with or without ferrule); tighten to 3.5 N·m after stripping 14 mm of insulation. IP20 rated on the body, IP40 within a modular enclosure — suitable for clean indoor panel environments. Pollution degree 3 per IEC 60947-2 covers the typical industrial control panel atmosphere (conductive dust, condensation).