630 A MCCB for high-fault panel feeders
The Siemens SENTRON 3VA2463-6HN32-0BL0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, sized for main feeder or large motor protection in industrial switchboards. Its interrupting capacity hits 242 kA at 240 V and still holds 187 kA at 415 V — enough to handle high-fault utility transformers without cascading upstream breakers. The line protection design means it's optimized for cable and busbar protection, not specific motor overload curves. Thermal derating is published across the full range: 630 A at 40 °C drops to 520 A at 70 °C, so a warm panel environment costs you about 17 % of the rating. The breaker dissipates 164.5 W max, which needs to be factored into enclosure ventilation for a closed-door installation (–,).
Interrupting capacity and selectivity headroom
At 500 V the breaker still interrupts 121 kA; at 690 V it drops to 9 kA. For a 480 V distribution panel the 187 kA at 440 V is the relevant figure — well above typical utility fault levels, giving selectivity margin with downstream breakers. The 3-pole form factor fits standard MCCB mounting patterns in switchgear. The auxiliary switch complement includes two auxiliary switches plus a trip alarm and an electrical alarm switch (HQ type), which covers remote status feedback without an add-on module. An undervoltage release (UVR) is integrated — it trips the breaker when control voltage drops below threshold, useful for emergency-stop circuits or undervoltage protection on motor feeders.
Physical fit and environmental limits
Dimensions: 110 mm deep, 138 mm wide, 248 mm tall. That width is standard for a 630 A frame — verify panel cutout and busbar spacing against the existing switchgear layout. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. The trip indicator is present, and there is no voltage-trigger function or communication module on this variant.