The Schneider Electric A9Z35491 is a 4-pole residual current circuit breaker (RCCB) from the Acti9 iID series, rated 100 A at 380–415 V AC 50/60 Hz. It protects against earth leakage at 300 mA sensitivity, Type A-SI (Super Immunised), meaning it handles pulsed DC fault currents and is immunised against nuisance tripping from transient surges or harmonic loads — a common requirement on variable-speed-drive or UPS-fed circuits. The selective (time-delayed) characteristic coordinates with downstream RCCBs so only the faulted branch trips, keeping the rest of the panel live. Clip-on DIN-rail mounting, 72 mm wide (8 x 9 mm pitches), with a depth of 73 mm and height of 91 mm. IP20 finger-safe terminals; IP40 on the modular enclosure. Rated conditional short-circuit current (IΔn) is 10 kA, and the making/breaking capacity (Idm / Im) is 1500 A — enough for most distribution sub-panels. The voltage-independent trip mechanism means the RCCB clears a fault even if the line voltage collapses, which is critical for safety in industrial environments.
The A9Z35491 is listed as current-production (active lifecycle stage). No official successor has been issued — this is the standard Acti9 iID RCCB for 4-pole, 100 A, 300 mA selective applications.
Terminals accept double front or back entry: rigid up to 35 mm² front, 25 mm² back; flexible with ferrule up to 25 mm² front, 16 mm² back. Wire stripping length 14 mm for top or bottom connection. Tightening torque 3.5 N·m. Neutral is on the left. Padlocking device provision for lockout/tagout. Pollution degree 3 (conductive or dry non-conductive pollution).
Designed and certified to EN/IEC 61008-1 and EN/IEC 61008-2-1. Impulse withstand 8/20 µs, 3000 A per those standards. Rated insulation voltage 500 V AC; impulse withstand voltage 6 kV. Electrical durability 10,000 cycles (AC-1), mechanical durability 20,000 cycles. Contact position indicator visible on the toggle.