630 A MCCB with 330 kA interrupting rating — what that means for your main feeder
The Siemens 3VA2463-7HN32-0DA0 is a SENTRON molded case circuit breaker rated for 630 A continuous current at 40 °C ambient, with a maximum interrupting capacity of 330 kA at 240 V AC. That 330 kA figure is the SCCR at the lowest voltage — it drops to 242 kA at 415/440 V and 187 kA at 500 V, so the real coordination study should use the voltage your transformer secondary actually runs. At 690 V it still clears 9 kA, which covers most 690 V industrial feeders.
Dimensions are 248 mm tall, 138 mm wide, 110 mm deep — standard 3-pole MCCB footprint for a 630 A frame, mounts on a DIN rail or directly to a backplate.