The Schneider Electric A9N26643 is a Vigi xC60 add-on residual current device (RCD) from the Acti9 range, designed to clip onto the outgoing side of a compatible MCB to provide earth-leakage protection in a 4-pole, 63 A circuit on a 400...415 V AC network. It is a voltage-independent, electromechanical device with a 30 mA sensitivity (Type AC, instantaneous trip), meaning it detects sinusoidal AC earth faults and disconnects the circuit without needing an external power supply for the trip coil — a key reliability feature for critical protection paths.
Clip-on mounting to DIN rail, 7 x 9 mm pitches wide (135 mm), 87 mm tall, 74.5 mm deep. The bottom tunnel terminals accept 1...35 mm² rigid or 1...25 mm² flexible conductors, stripped 14 mm, torqued to 3.5 N·m. IP20 finger-safe on the front, IP40 inside a modular enclosure. The red indicator on the front face shows tripped status for quick visual fault isolation on the panel door.
Compliant with EN/IEC 61009-1 and EN/IEC 61009-2-1 — the harmonized standards for residual current operated circuit-breakers with integral overcurrent protection. The 8/20 µs impulse withstand of 250 A covers surge coordination in typical industrial distribution.