What it is and what it does
The Siemens 3VA2463-6KP32-0JA0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in industrial power distribution. It's a 3-pole unit rated for 630 A continuous current, which means it can feed a main bus or a large downstream panel without derating at 40 °C. Breaking capacity is the headline here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. That covers high-fault installations like transformer secondaries or large motor control centers where available fault current exceeds typical 65 kA or 100 kA MCCBs. The overcurrent release is the ETU850 electronic trip unit, configurable for long-time, short-time, instantaneous, and ground-fault protection (though ground-fault monitoring is not fitted on this variant). A shunt trip (STL) auxiliary release is built in for remote tripping via a control signal.
Thermal derating and panel fit
The 630 A rating holds at 40 °C ambient. Above that, the unit derates linearly: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. If your panel runs hot — say, a packed enclosure with multiple breakers — size the breaker for the actual ambient, not the nameplate. Footprint is 138 mm wide, 248 mm high, 110 mm deep. That's a standard 3-pole MCCB form factor for a 630 A frame; it fits most DIN-rail or screw-mounted panel layouts without surprises. Maximum power loss is 162 W — noticeable heat in a sealed enclosure. Account for it in your thermal calculation if the panel is NEMA 12 or IP54.