What this MCCB delivers
The Siemens SENTRON 3VA2463-6HN32-0CH0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with interrupting capacity of 242 kA at 240 V AC. The interrupting curve drops to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V — so the SCCR headroom is strongest on 240 V and 480 V distribution, but you lose a lot of that margin above 500 V. Designed for line protection (not motor or generator duty), it carries a built-in undervoltage release (UVR) and provisions for 2 auxiliary switches plus a trip alarm switch (HQ).
Ratings that drive the fit
Continuous current derates from 630 A at 40 °C down to 520 A at 70 °C (the max operating temp). That 110 A drop means the breaker's real-world capacity in a warm panel is 520 A — size the upstream transformer and busbar accordingly. The maximum power loss is 164.5 W, so account for that heat in the enclosure ventilation budget. Physical footprint: 248 mm tall, 138 mm wide, 110 mm deep. That depth (110 mm) is the dimension from the mounting surface to the front of the breaker — important for shallow backpanel clearance. The 138 mm width per 3-pole unit is standard for this frame class, so it fits existing SENTRON 3VA panel layouts without re-drilling. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The storage limit governs handling during transport — the breaker can sit in a cold warehouse at -40 °C, but don't energize it below -25 °C.
Panel integration notes
Mounts on a standard DIN rail or direct panel. The 3VA frame accepts plug-in or fixed connections; this order code ships with the undervoltage release pre-installed. The auxiliary switch block (2 aux + 1 trip alarm) is factory-configured — no field assembly required. For a retrofit into an existing SENTRON lineup, the 138 mm width per pole matches the 3VA family footprint, so busbar alignment holds.