630 A MCCB with 242 kA interrupting capacity
The Siemens SENTRON 3VA2463-6HN32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for 630 A continuous current at 40 °C, with a maximum breaking capacity of 242 kA at 240 V AC. That interrupting rating drops to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V — so the real-world SCCR you spec against depends entirely on your system voltage. At 40 °C it carries the full 630 A; derate linearly through 70 °C where it holds 520 A. This is a line-protection design (not motor-protection), with a shunt trip (STL) auxiliary release and two auxiliary switches plus one trip alarm switch HQ built in.
Panel fit and dimensions
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep — a standard SENTRON 3VA frame footprint that drops into existing DIN-rail or panel-mount layouts without re-drilling. The 110 mm depth (4.33 in) is the dimension that matters for enclosure depth clearance; the 138 mm width (5.43 in) sets the DIN-rail pitch. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 162 W, so factor that into enclosure thermal calculations if you're packing multiple breakers in a sealed cabinet.
What the ratings mean for your panel
The 242 kA breaking capacity at 240 V is the headline number, but the 187 kA at 415 V is the one that governs most European industrial panels. That's still high enough for virtually any distribution board downstream of a 2 MVA transformer — you'll get full selectivity with upstream fuses or a larger-frame MCCB. The 630 A continuous rating at 40 °C is the thermal baseline; if your panel ambient runs 50 °C, you're limited to 593 A continuous. The shunt trip (STL) lets you remote-trip via a PLC or emergency-stop circuit; the two auxiliary switches plus trip alarm give you status feedback for SCADA or local indication.