630 A MCCB with 330 kA interrupting rating — what that means for your panel
The Siemens SENTRON 3VA2463-7HN32-0DH0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, with a maximum breaking capacity of 330 kA at 240 V AC. That interrupting rating drops to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 9 kA at 690 V — so the voltage class of your distribution system directly governs whether this breaker has headroom for the fault current available. The 630 A frame is the rating that determines busbar lug sizing and cable termination — not the interrupting number.
Current derating across the ambient range
The continuous current rating is temperature-dependent: 630 A at 40 °C, derating to 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, and 520 A at 70 °C.