What it is and what it does
The Siemens 3VA2463-5HM32-0KK0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries a continuous current of 630 A at 40 °C, derated to 520 A at 70 °C — the thermal curve matters if your enclosure runs hot. The 3-pole design handles three-phase feeders up to 690 VAC. Breaking capacity is the headline here: 187 kA at 240 VAC, 121 kA at 415/440 VAC, 75.6 kA at 500 VAC, and 9 kA at 690 VAC. That 187 kA figure at 240 V means it can interrupt a massive fault without upstream coordination — useful for transformer secondaries or high-capacity bus risers where available fault current is high.
Ratings that decide fit
The adjustable thermal-magnetic trip is set with a full-scale of 630 A and a minimum trip of 945 A, maximum 5 670 A — that's a 1.5x to 9x range on the magnetic pickup. For motor feeders you'd typically set the magnetic short-circuit threshold above the inrush; for resistive loads you can run it tighter. The trip indicator and voltage trigger (shunt trip, STL) are built in, so you get remote trip capability without adding a separate undervoltage release. Auxiliary switching comes as one auxiliary switch, one trip alarm switch, and one electrical alarm switch (HQ configuration). That's enough for remote status on the breaker position, a fault signal, and a separate alarm for electrical trip — three discrete signals back to the PLC or SCADA without an external interposing relay. Power loss is 162 W maximum at rated load. That's not trivial in a sealed enclosure — factor it into your thermal budget alongside the other breakers in the same panel.
Where it goes and how it mounts
This MCCB mounts on a DIN rail or directly to a backplate. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — it needs about 3.4 liters of volume in the enclosure. The 110 mm depth means it clears most standard 200 mm deep enclosures with room for wiring gutters. Panel builders should check the gland plate clearance for the shunt trip and auxiliary switch wiring; the terminals are accessible from the front. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses down to -25 °C. No communication function on this variant — it's a standalone breaker, not a smart metering unit.