The A9F04370 is a Schneider Acti9 iC60 miniature circuit-breaker — 3-pole, C-curve, rated 0.5 A. It carries dual certification to EN/IEC 60898-1 (MCB standard for household and similar installations) and EN/IEC 60947-2 (industrial circuit-breaker standard), so it fits both commercial panel schedules and industrial MCCs. The 0.5 A rating is unusual — this is a very low-current MCB, typically used to protect a control transformer primary, a small power supply, or a sensitive instrument feed where a larger breaker would not clear a fault fast enough.
Snap-on DIN-rail mount (9 mm pitch occupies 6 modules = 54 mm width). Height 91 mm, depth 78.5 mm — fits standard distribution boards and enclosure cutouts. Double terminals top and bottom accept 1–25 mm² rigid or 1–16 mm² flexible; strip length 14 mm, torque to 2 N.m. The toggle handle and trip indicator give local status without opening the door. Overvoltage category IV allows installation at the service entrance or main distribution board.