The Schneider Electric A9P52604 is an Acti9 iC40 miniature circuit breaker rated 4 A with a C-curve trip characteristic, 1P+N configuration, and a breaking capacity of 6 kA Icu at 230 V AC per IEC 60947-2 or 4500 A Icn per IEC 60898-1. The C-curve means the magnetic trip operates at 5 to 10 times the rated current (5...10 x In per IEC 60898-1, or 8 x In +/-20% per IEC 60947-2), so it's sized for general-purpose distribution loads where moderate inrush from small motors or transformers is expected — not for high-inrush circuits like large drives or for purely resistive loads where a B-curve would be tighter. The 1P+N pole arrangement switches the phase and switches the neutral without overcurrent protection on the neutral; the neutral position is left. At 4 A, this is a low-current branch or sub-distribution MCB, not a main feeder breaker. The dual standard listing (EN/IEC 60898-1 for household and similar installations, EN/IEC 60947-2 for industrial applications) means this MCB can be specified into either a domestic consumer unit or an industrial panel, but the 6 kA Icu rating at 230 V AC is the industrial short-circuit capacity you'd use for coordination studies. The limitation class 3 (per IEC 60898-1) means it lets through less fault energy than class 1 or 2 breakers, which helps with downstream selectivity and reduces arc-flash risk at the sub-panel.
Clip-on mounting to DIN rail (35 mm symmetrical rail per EN 60715) — 2 module pitches (9 mm each, so 18 mm wide). Tunnel-type terminals accept 1...16 mm² rigid or 1...10 mm² flexible cable; strip length 14 mm, tightening torque 2 N·m. The toggle control gives local ON/OFF and trip indication via the contact position indicator.