The Schneider Electric A9Z22491 is an Acti9 iID 4-pole residual current circuit breaker (RCCB) rated for 100 A continuous current at 380-415 V AC, 50/60 Hz network frequency. The 100 mA earth-leakage sensitivity and Type A protection class mean it detects sinusoidal AC fault currents plus pulsating DC fault currents — the standard choice for circuits feeding electronic loads like variable-speed drives, UPS systems, and IT equipment where smooth DC ripple can blind a basic AC-only RCD.
Clip-on mounting to a 35 mm DIN rail (8 x 9 mm pitches) — the 72 mm width (4-module) footprint fits standard distribution board cutouts. Neutral on the left, toggle control, padlocking provision for lockout/tagout. IP20 finger-safe terminals; IP40 front face when enclosed in a modular enclosure. Wire range: 1-35 mm² rigid front, 1-25 mm² flexible front, with double-terminal access for daisy-chaining or feed-through.
Rated conditional short-circuit current (Icn) is 10 kA per EN/IEC 61008-1 — coordinates with a 10 kA upstream MCB or fuse for fault clearance. The voltage-independent residual current tripping technology means the RCCB operates without an auxiliary supply: even if the phase voltage drops, the leakage detection still triggers on a fault. Electrical durability 10,000 cycles (AC-1 resistive load), mechanical 20,000 cycles.