What this 630 A MCCB is and what it does
The Siemens 3VA1463-5GF42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 630 A continuous current, with a TM240 thermal-magnetic overcurrent release. It's a 4-pole unit designed for line protection — meaning it sits at the main feeder or large subfeed in a distribution panel, not on a motor branch. The 630 A rating holds flat from 40 °C up to 50 °C ambient; above that it derates to 618 A at 55 °C, 607 A at 60 °C, 595 A at 65 °C, and 583 A at 70 °C. If your panel ambient runs hot, that derating curve is the number that decides whether this frame size works or you step up.
Breaking capacity — the real selectivity number
Breaking capacity varies sharply with system voltage: 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. For a 480 V panel (common in North America), the 75.6 kA at 500 V is the closest published figure — that's well above typical available fault current for most industrial services, so you've got headroom for selective coordination downstream. The insulation voltage is rated 800 V, so the breaker itself is comfortable on 690 V systems even though the interrupting rating drops there.
Physical fit and panel integration
Dimensions are 248 mm high, 184 mm wide, 110 mm deep. That's a 4-pole frame — the width is the key check for existing panel gutters and busbar centers. No undervoltage release, no shunt trip, no communication module on this variant; it's a straight thermal-magnetic breaker with no auxiliaries. If your BOM calls for a trip indicator or voltage trigger, this isn't that version. The TM240 release means the thermal element is calibrated for a 240 A frame trip — the breaker itself is a 630 A continuous device, so the trip unit matches the frame.