The Siemens SENTRON 3VA2463-5JQ32-0AH0 is a 3-pole molded case circuit breaker rated for line protection, with a full-scale current of 630 A. Its interrupting capacity hits 187 kA at 240 V and 121 kA at both 415 V and 440 V, dropping to 75.6 kA at 500 V and 9 kA at 690 V — so it handles high-fault utility feeds and transformer secondaries where the available short-circuit current is substantial. The breaker includes a built-in communication function, which means it can report status and trip events to a PLC or BMS without an add-on module.
Thermal derating and panel fit
The continuous current rating is temperature-dependent: 630 A at 40 °C, stepping down to 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. If your enclosure ambient runs above 40 °C, size the breaker for the derated value — not the nameplate 630 A. The case dimensions are 248 mm high, 138 mm wide, and 110 mm deep, so it fits standard MCCB panel cutouts; verify the door cutout and bus-bar spacing before committing the BOM line.
Auxiliary switching and trip indication
This variant ships with 2 auxiliary switches plus 1 trip alarm switch (HQ design), giving remote status for open/closed and a separate contact for trip events. The trip indicator is present on the front face, so a walk-by inspection catches a tripped breaker without opening the panel door. Power loss at full load is 162 W maximum — account for that heat in your enclosure thermal calculation.