The Schneider Electric A9Z26491 is a 4-pole Acti9 iID residual current circuit breaker (RCCB) rated for 100 A continuous current with a 500 mA earth-leakage sensitivity.
The 100 A rated current (In) and 380...415 V AC operational voltage (Ue) size this RCCB for main-switch or sub-distribution duty on a 3-phase 4-wire supply. The voltage-independent trip mechanism means it clears a ground fault even if the neutral is lost — no auxiliary supply needed. The instantaneous time delay (no intentional delay) trips as soon as the leakage exceeds 500 mA, so it protects against arc faults but won't coordinate with a delayed RCCB downstream. The 6 kV impulse withstand (Uimp) and 250 A 8/20 µs surge immunity mean it holds up against switching transients and indirect lightning strikes common in industrial panels. Pollution degree 3 confirms it's rated for the conductive-dust and humidity environment inside an unsealed enclosure.
Clip-on DIN rail mounting, neutral on the left. Strip 14 mm, torque to 3.5 N·m. The 8-module width (72 mm) matches standard Acti9 comb-busbar spacing.
The A9Z26491 is listed as current-production (active lifecycle stage). The part carries EN/IEC 61008-1 and 61008-2-1 compliance, with IP20 (IP40 in modular enclosure) ingress protection. No official successor exists; this is the active catalog number for the 100 A 4P iID RCCB in the Acti9 range.