The Schneider Electric A9F03650 is an Acti9 iC60N miniature circuit breaker rated 50 A with a B curve, 1P+N configuration. The 36 kA Icu at 12…60 V AC (EN/IEC 60947-2) tells you it can safely interrupt a fault up to that level without failing; the 6 kA Icn at 230 V (EN/IEC 60898-1) is the domestic-grade rating for the same part. That dual-standard listing (60947-2 for industrial, 60898-1 for residential) means it qualifies for either panel type, which simplifies BOM management. The 1P+N pole arrangement switches the line and disconnects the neutral, protecting one pole. The neutral position is left, so it lands predictably on the DIN rail in a standard distribution board. Thermal-magnetic trip technology covers both overload (thermal bimetal) and short-circuit (magnetic solenoid) — no electronics to fail, no auxiliary power needed.
Mounts on a DIN rail — standard snap-on fit for any enclosure. Takes 4 module pitches (36 mm width), so it occupies four 9 mm slots in the board. Height is 91 mm, depth 78.5 mm — check your enclosure door clearance if you're fitting a cover or gland plate.
Pollution degree 3, overvoltage category IV, tropicalisation class 2 per IEC 60068-1 (handles 95 % RH at 55 °C). The part carries a trip indicator and contact position indicator for visual status at the panel.