Fixed 630 A MCCB with TM220 release — what the ratings mean for your panel
The Siemens SENTRON 3VA1463-5GE42-0AA0 is a 4-pole molded case circuit breaker rated at a fixed 630 A — no adjustment band, no trip-flag indicator, just a straight thermal-magnetic TM220 release sized for line protection in distribution panels. The interrupting capacity is what varies with system voltage: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 11.9 kA at 690 V. At 630 A continuous, the power loss hits 192.9 W maximum — that's heat you need to vent in the enclosure.
Thermal derating — where the 630 A holds and where it drops
The breaker carries the full 630 A from 40 °C through 50 °C ambient. At 55 °C it derates to 618 A, at 60 °C to 607 A, at 65 °C to 595 A, and at 70 °C to 583 A. If your panel ambient runs hot — say, near a transformer or in a non-conditioned enclosure — the 55 °C to 70 °C band is where you lose roughly 2% to 7.5% of the rating.
Panel fit — dimensions and IP rating
The 3VA1463-5GE42-0AA0 measures 248 mm high, 184 mm wide, and 110 mm deep — a 4-pole frame that needs a 7.24-inch wide cutout in the panel door. Front face carries IP40 protection, meaning it's sealed against tools and wires over 1 mm but not against water ingress. No undervoltage release, no communication module, no ground-fault monitoring on this variant — it's a bare line-protection breaker.