What this MCCB carries — and what that means for your panel
The Siemens SENTRON 3VA2463-5KQ32-0AA0 is a 3-pole molded case circuit breaker rated for continuous current of 630 A, designed for line protection in distribution panels. Its interrupting capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V — so the same frame handles high-fault service entrances (typical 240 V North American) and medium-voltage industrial feeders (690 V European) without a frame-size jump. The 630 A rating is at 40 °C; above that, the thermal derating curve drops 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 panel ambient runs above 40 °C, size the breaker for the derated value, not the nameplate 630 A. The breaker includes a communication function and ground-fault monitoring via summation current formation on the L-conductor, so it can report status and leakage to a BMS or PLC without an external GFCI module. Maximum power loss is 162 W — account for that heat in the enclosure ventilation calculation.
Panel fit and mounting
Dimensions are 110 mm depth, 138 mm width, 248 mm height (4.33 x 5.43 x 9.76 in). The 3-pole frame mounts on a standard DIN rail or direct panel-mount via the SENTRON base. Verify the cutout against your existing backpan — the 138 mm width is the same as other 630 A SENTRON frames, so a panel built for a 3VA2 630 A breaker accepts this one without rewiring.
Coordination and selectivity notes
The breaker is designed for line protection, meaning it coordinates downstream with branch MCCBs and fuses. The minimum short-circuit setting is 945 A, maximum 5 670 A — adjust the magnetic trip to avoid nuisance tripping on motor inrush while still clearing a bolted fault. No undervoltage release or voltage trip is fitted on this variant, so it stays closed through a sag unless you add an external shunt trip.