SENTRON 3VA2 MCCB — 63 A, 3-Pole, Line Protection
The Siemens 3VA2163-5HL32-0DL0 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 that ceiling. Three poles, designed for line protection (cable and distribution feeder duty), not motor branch-circuit protection. The interrupting capacity is 187 kA at 240 VAC, dropping to 121 kA at 415/440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA at 240 V is a high-endurance fault-clearing figure for low-voltage distribution — it handles worst-case bolted faults on the secondary side of a typical 1500 kVA transformer without cascading upstream.