What this MCCB delivers
The Siemens SENTRON 3VA2463-7HL32-0KC0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, with a maximum breaking capacity of 330 kA at 240 V AC and 242 kA at 415 V AC. That 330 kA figure at 240 V means it can safely interrupt a fault current up to that level without cascading upstream — critical for high-fault installations like transformer secondaries or large motor control centers. The breaker is designed for line protection (cable and busbar protection), not motor or generator protection, so it trips on overload and short-circuit to protect the distribution feeder. It ships with a factory-installed shunt trip (STL) release and two auxiliary switches (HQ configuration), so you get remote tripping capability and status feedback without additional wiring. The shunt trip lets a safety PLC or emergency-stop circuit cut power remotely — useful in automated lines where a downstream fault needs to isolate the breaker.
Thermal derating and power loss
The 630 A rating holds at 40 °C ambient. Above that, the breaker derates linearly: 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. If your panel ambient runs hot — say, a non-ventilated enclosure near a furnace — you need to size for the derated current, not the nameplate 630 A. Maximum power loss is 162 W, which factors into enclosure thermal calculations.
Dimensions and panel fit
Physical footprint: 138 mm wide, 248 mm tall, 110 mm deep. That 138 mm width is standard for a 3-pole 630 A frame in the SENTRON range — it matches the cutout and busbar spacing for most 630 A MCCB panels. Depth of 110 mm includes the operating mechanism and terminal covers; allow clearance for cable bending radius and the shunt trip wiring.