What the ratings mean for fit
The 3VA2063-7KQ46-0KB0 is a Siemens SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous at ambient temperatures from 40 °C through 70 °C — no derating curve to chase across the panel thermal gradient. That flat thermal profile matters when the breaker sits next to other heat sources in a crowded enclosure; you don't lose ampacity as the cabinet warms up. Interrupting capacity runs from 330 kA at 240 V down to 3 kA at 690 V. At 415 V and 440 V it holds 242 kA — that's the figure most distribution panels will reference for SCCR compliance. The 756 A maximum and 95 A minimum on the interrupting range tell you the breaker can clear faults well above its 63 A frame, which is typical for a line-protection MCCB sized to handle inrush without nuisance trips.
Panel integration and wiring
Footprint is 86 mm deep, 140 mm wide, 181 mm tall — a 4-pole MCCB that fits standard Siemens SENTRON mounting plates and busbar systems. The supplied basic switch is order code 3VA20637KQ460AA0; auxiliary switch complement is two HP-type switches plus a shunt trip (STL) release. Communication function is built in, so the breaker reports status to a higher-level controller without an add-on module. Power loss is listed at 3 W maximum — negligible for thermal budgeting inside the panel, but worth noting if you're packing multiple breakers into a small sub-distribution board.