That 63 A holds at every temperature point the spec lists, so you don't lose capacity in a warm enclosure.
Interrupting capacity — what the voltage columns mean
This 3-pole MCCB delivers 242 kA interrupting capacity at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V.
Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — a standard SENTRON 3VA2 frame footprint that drops into the same panel cutout as other 3VA2 breakers. Ships with three HQ auxiliary switches pre-installed, so you get remote status indication without ordering add-on modules separately. Power loss is 5.4 W maximum — negligible for enclosure thermal calculations but worth noting if you're packing a high-density row.