630 A MCCB with 242 kA interrupting capacity — the selectivity anchor for high-fault panels
The Siemens SENTRON 3VA2463-6HL32-0AG0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with a maximum interrupting capacity of 242 kA at 240 V. That 242 kA figure is the headline: it lets this breaker serve as the main or tie device in a switchboard where fault current exceeds 200 kA — common in large industrial services and data-center utility entrances. The ETU320 electronic trip unit provides LI (long-time and instantaneous) protection curves, adjustable via the front dials, so you tune the pickup and delay to coordinate with downstream feeders without swapping trip packs. Rated insulation voltage is 800 V, and the breaker carries a full thermal derating table: 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. Maximum power loss is 162 W, which matters for enclosure heat-rise calculations in a sealed or high-density cabinet.
Mounting and integration — panel footprint and wiring
The breaker mounts with four screws through the base — no DIN-rail clip — so plan for a drilled backplate.
Breaking capacity by voltage — coordination data for the engineer
Interrupting capacity varies by system voltage: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. The 690 V rating at 40 kA is enough for most 690 V drives and motor control centers.