The A9F07663 is a 63 A rated miniature circuit-breaker from the Acti9 iC60H family, 1P+N poles, C-curve. Magnetic trip at 8 x In ±20 %. Breaking capacity is 42 kA Icu at 12-60 V AC, 30 kA at 100-133 V, 15 kA at 220-240 V.
Mounts on standard DIN rail, 36 mm wide (4 x 9 mm pitches), 91 mm high, 78.5 mm deep. That 36 mm width for a 1P+N is tight — leaves room for adjacent breakers in a multi-pole assembly. Double terminals top and bottom accept 1-35 mm² rigid or 1-25 mm² flexible, so you can daisy-chain a busbar or land a fat feeder. Wire strip 14 mm, torque to 3.5 N.m. IP20 finger-safe front, but the terminals are live when the breaker is on — keep the gland plate clear of exposed copper.
Pollution degree 3, overvoltage category IV.