The Siemens 3VA1463-5EF32-0AH0 is a SENTRON molded case circuit breaker (MCCB) built for line protection in industrial power distribution. It's a 3-pole unit with a TM240 thermal-magnetic overcurrent release, rated 630 A continuous at 40 °C ambient. At 240 V it interrupts up to 187 kA, which is the kind of fault current you see on the secondary side of a big transformer feeding a plant main switchboard. This is not a feeder breaker for a light-duty subpanel — it's sized for the main incoming or a heavy bus riser where the available fault current is serious.
What the ratings mean in a real panel
The 630 A rating holds all the way to 50 °C and only starts to derate above that — 618 A at 55 °C, 607 A at 60 °C, 595 A at 65 °C, 583 A at 70 °C. That thermal curve matters if this breaker lives in a crowded enclosure or a hot mechanical room where ambient drifts. The interrupting ratings step down as voltage climbs: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 11.9 kA at 690 V. On a 480 V system you've got 121 kA of interrupting capacity — that's enough to handle almost any utility transformer secondary without worrying about cascading failure upstream. The insulation voltage is rated 800 V, so the breaker itself is comfortable on 690 V systems where the phase-to-phase voltage sits well inside that ceiling.
Panel integration and physical fit
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. The 110 mm depth is the critical dimension for enclosure fit.