The Schneider Electric A9K02363 is a 63 A, 3-pole miniature circuit breaker from the Acti9 K60N range, with a C curve and a 6 kA breaking capacity at 400 V AC per EN/IEC 60898-1. It uses a thermal-magnetic trip unit, so it handles overloads (thermal) and short-circuits (magnetic) in one package.
Fixed mounting, toggle control, IP20 finger-safe terminals. The tunnel-type terminals accept 0.5 to 35 mm² rigid wire; strip 14 mm, torque to 3.5 N.m.
That means it's still a standard catalog item, not a phase-out or last-time-buy. For a storeroom, that's one less SKU to worry about cross-referencing for the next few years.
The limitation class is 3 per the same standard, meaning it limits let-through energy well — good for protecting downstream equipment. The 10,000 electrical / 20,000 mechanical cycles are typical for this class; fine for normal switching duty, not for frequent on/off as a motor controller.