What this 630 A MCCB covers
The Siemens SENTRON 3VA1463-5GF42-0DB0 is a 4-pole molded case circuit breaker with a fixed 630 A rating, designed for line protection in distribution panels. The 630 A is the minimum and maximum current rating — it is not adjustable, so the load must match that value exactly. Breaking capacity runs from 187 kA at 240 V down to 11.9 kA at 690 V, so the available fault current at the installation point determines whether this frame is adequate. The insulation voltage is rated 800 V, which covers 480/277 V and 600 V systems with headroom.
Thermal derating and power loss
The breaker carries its full 630 A from 40 °C through 50 °C ambient. Above that it derates: 618 A at 55 °C, 607 A at 60 °C, 595 A at 65 °C, and 583 A at 70 °C. Maximum power loss is 195.4 W, which matters for enclosure ventilation if the panel runs warm. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Accessories and auxiliary configuration
This variant ships with an undervoltage release (UVR) and two high-performance auxiliary switches. There is no ground-fault monitoring, no communication module, no trip indicator, and no voltage trigger. The basic switch is order code 3VA14635GF420AA0. If you need communication or ground-fault, this is not the variant — you would step to a different suffix in the 3VA1 family.
Physical fit
Dimensions are 248 mm high, 184 mm wide, and 110 mm deep. The 4-pole frame mounts in a standard distribution panel footprint. The 110 mm depth is shallow enough for most wall-mount enclosures without a deep-can extension.