The Siemens SENTRON 3VA1063-3ED42-0KC0 is a 4-pole molded case circuit breaker (MCCB) rated 63 A continuous at 40 °C ambient, with no derating needed up to 50 °C — it holds 63 A through that range, then drops to 62 A at 55 °C and 58 A at 70 °C. That thermal curve means the breaker can sit in a warm enclosure without losing headroom, as long as the ambient stays under 50 °C. The interrupting rating is 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V, which covers most low-voltage distribution fault levels in North American and IEC panels. At 500 V and 690 V the rating settles to 7.5 kA, so verify the available fault current on 480 V or 600 V systems before specifying.
The 101.6 mm width (4 inches) is the standard footprint for a 4-pole MCCB in the SENTRON 3VA family, so it drops into the same DIN-rail or screw-mount slot as other 4-pole 3VA units without re-drilling the backplate.
Auxiliary release and internal configuration
The design is line protection (not motor protection), so it is sized for feeder or branch-circuit protection in distribution panels.