The A9Q31325 is a 3-pole add-on residual current device from the Acti9 Vigi iC60 range, rated 25 A with 30 mA earth-leakage sensitivity. It clips onto a compatible Acti9 iC60 MCB via the plug-in connection, so you don't need extra wiring between the breaker and the RCD — that's one less junction to torque-check. The Type A-SI (Super Immunised) earth-leakage protection handles pulsed DC fault currents and resists nuisance tripping from high-frequency leakage common on modern electronics — think VFDs, UPS gear, or LED drivers on the same subcircuit. It's voltage-independent, so it trips even if the neutral is lost upstream. Rated operational voltage is 400...415 V AC at 50/60 Hz, with an insulation voltage of 500 V AC and impulse withstand of 6 kV. Pollution degree 3 per IEC 60947-2 means it's rated for the conductive-dust environment you find in most industrial panels — not just clean residential gear.
Depth is 73.5 mm, height 91 mm. The bottom tunnel terminals accept 1...25 mm² rigid or 1...16 mm² flexible, stripped 14 mm, torqued to 2 N.m. Comb busbar compatible on the bottom — that's a clean way to daisy-chain phase feeds across a row of RCD/MCB pairs. IP20 on the body, IP40 inside a modular enclosure — standard for panel-mount. The trip indicator gives a local visual of which pole tripped, which saves chasing a fault with a clamp meter.
Standards and lifecycle
Compliant with EN/IEC 61009-1 and EN/IEC 61009-2-1 (the RCBO standard for household and similar installations) plus IEC 60947-2 for the insulation and impulse ratings. The 8/20 µs impulse withstand of 3000 A per IEC 61009-1 means it survives surge events from nearby lightning or switching without welding the contacts.