What this MCB does on the rail
The Schneider Electric A9F07604 is an Acti9 iC60H miniature circuit breaker rated 4 A, 1P+N, curve C, with a breaking capacity of 70 kA Icu at 220...240 V AC 50/60 Hz per EN/IEC 60947-2 and 10 kA Icn at 230 V AC per EN/IEC 60898-1. That 70 kA Icu figure means it handles high fault currents typical in industrial distribution panels without upstream coordination headaches — you can land it downstream of a transformer or a main breaker rated up to that level. The thermal-magnetic trip unit gives magnetic tripping at 8 x In +/- 20 %, so it clears short-circuit faults fast while riding through motor inrush on C-curve. Mounts on DIN rail, takes 4 module pitches (9 mm each), and the double terminals accept up to 25 mm² rigid or 16 mm² flexible — enough for a 4 A feeder in a control cabinet.
Overvoltage category IV suits main incoming panels. IP20 finger-safe terminals.