The Schneider Electric A9F07340 is an Acti9 iC60H miniature circuit breaker rated at 40 A, 3-pole, with a C-curve trip characteristic. It's a thermal-magnetic MCB built for distribution boards and sub-panels where you need overcurrent and short-circuit protection on a 3-phase load. Breaking capacity hits 42 kA Icu at 12–133 V AC, 30 kA at 220–240 V, and 15 kA at 380–415 V. That's a lot of fault-clearing muscle for a 40 A MCB — it'll ride through a hard short on a heavily-rated industrial panel without welding its contacts shut.
DIN rail fit and panel space
Snaps onto a standard DIN rail; width is 54 mm (6 x 9 mm pitches), height 91 mm, depth 78.5 mm. That 78.5 mm depth means it clears most shallow enclosures — check your gland plate clearance if you're retrofitting into a tight 100 mm-deep box.
Dual-rated to EN/IEC 60947-2 (industrial) and EN/IEC 60898-1 (household/residential). That means it's accepted in both panel-building and final-distribution applications — a single part number covers both standards. Overvoltage category IV, so it can sit at the service entrance or main distribution board. Isolation suitable per both standards, with a visible contact position indicator and a trip indicator for quick fault identification. IP20 finger-safe terminals.