630 A MCCB with 187 kA SCCR — selectivity headroom for high-fault panels
The Siemens 3VA2463-5KP32-0JC0 is a 3-pole SENTRON molded case circuit breaker rated for 630 A continuous current at 40 °C, with a short-circuit breaking capacity of 187 kA at 240 V AC. That SCCR figure drops to 121 kA at 415 V and 440 V, then to 75.6 kA at 500 V, and 17 kA at 690 V — so the 240 V rating is the headline number for high-fault installations, but at 400 V class you still have 121 kA, which covers most industrial service-entrance and distribution applications. The ETU850 electronic trip unit gives you adjustable LSI curves plus communication capability, so this breaker fits into a selective coordination scheme with upstream main breakers or downstream feeders.
What the ratings mean for your panel
The 630 A rating at 40 °C is the base continuous current; above that ambient, derate linearly to 450 A at 70 °C (the maximum operating temperature). The rated insulation voltage Ui of 800 V means the breaker is insulated for 800 V phase-to-phase, so it can be used on 480 V and 600 V class systems without derating the insulation. The 162 W maximum power loss at full load matters for enclosure thermal management — if you're packing multiple breakers in a single cabinet, that heat adds up and may drive forced ventilation or a larger enclosure. The 15 000 mechanical endurance cycles (latching) is typical for a frame this size; not a high-cycle application breaker, but fine for main or feeder duty where switching is infrequent.
Integration and wiring
The breaker measures 248 mm high × 138 mm wide × 110 mm deep. It mounts on a mounting plate or back panel — not DIN rail at this frame size. The shunt trip (STL) is factory-installed (design of the auxiliary release: shunt trip), and the two HQ auxiliary switches are integrated. The basic switch assembly carries order code 3VA2463-5KP32-0AA0, and the integrated auxiliary trip module is 3VA9688-0BL32 — useful if you need to order replacement sub-assemblies. The communication function is onboard, so you can integrate it with a BMS or SCADA system for remote monitoring and trip indication.