Line protection breaker with a full interrupting curve
That's a solid 63 A all the way, so you don't have to oversize for a warm panel. Interrupting capacity is the headline here: 242 kA at 240 VAC, 187 kA at 415/440 VAC, 121 kA at 500 VAC, and 3.7 kA at 690 VAC.
Built-in undervoltage release and auxiliary switching
It also carries two auxiliary switches plus a separate trip alarm switch (HQ), so you get status feedback for open/closed and a dedicated signal for a fault trip. That's enough for a PLC input or a remote annunciator without adding external relays.
Panel fit and thermal management
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — a standard 3-pole MCCB footprint for a 63 A frame. Power loss is 6.5 W maximum at rated current, so heat buildup in a sealed enclosure is manageable; you won't need forced ventilation for a single unit.