63 A SENTRON MCCB — line protection with undervoltage release
The Siemens 3VA2063-5HL36-0BC0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to the 70 °C operating maximum. That makes it a drop-in for panels where ambient heat buildup is a concern; the breaker holds its full 63 A rating even in a warm cabinet. Three-pole construction with a line-protection design means it's configured for feeder or branch-circuit duty, not motor protection. The interrupting ratings are substantial: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. At 240 V, that 187 kA covers high-fault scenarios near the transformer secondary without cascading upstream.