The Schneider Electric A9Z11491 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. The voltage-independent tripping mechanism means the RCCB clears a ground fault even if the phase voltage collapses — no auxiliary supply needed. Breaking capacity is rated Idm 1500 A and Im 1500 A — this is the short-circuit withstand for the RCCB itself, not a branch-circuit interrupting rating. Upstream protection (MCB or fuse) must coordinate to keep fault current below that level. The rated impulse withstand voltage of 6 kV and pollution degree 3 suit it for fixed installations in industrial or commercial panels where the environment is not clean.
The 4-pole body occupies 8 x 9 mm pitches (72 mm width). Neutral is on the left. Wire stripping length is 14 mm for top or bottom connection.
The 8/20 µs impulse withstand of 250 A confirms electromagnetic compatibility with surge events per the same standard. Mechanical durability is 20,000 cycles; electrical durability under AC-1 resistive load is 10,000 cycles.