What this 630 A MCCB carries
The Siemens 3VA2463-5HN42-0KH0 is a SENTRON molded case circuit breaker rated for 630 A continuous at 40 °C, with a 4-pole configuration and line protection design. The 187 kA breaking capacity at 240 V tells you this unit handles high-fault utility feeds or transformer secondaries without cascading upstream — the interrupting rating drops to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V, so match it to the available fault current at the point of installation.
Thermal derating and real-world current
The 630 A rating is at 40 °C ambient inside the enclosure. At 45 °C it carries 612 A, at 50 °C it carries 593 A, at 55 °C it carries 575 A, at 60 °C it carries 557 A, at 65 °C it carries 538 A, and at 70 °C it carries 520 A. If your panel runs hot — say 50 °C near a transformer or drive bank — you lose about 6% of the headroom. The maximum power loss is 162 W, so factor that into the enclosure's thermal budget.
Dimensions and panel fit
The 3VA2463-5HN42-0KH0 measures 248 mm high, 184 mm wide, and 110 mm deep. That 184 mm width is the 4-pole footprint — it won't drop into a 3-pole cutout without a wider backplate. The 110 mm depth includes the arc chamber and terminals; verify gland-plate clearance if the breaker sits near the back wall of a shallow enclosure.
Auxiliary and release options
This unit ships with 2 auxiliary switches plus 1 trip alarm switch (HQ design), plus a shunt trip release (STL) for remote tripping. The trip indicator and voltage trigger are present; there is no undervoltage release, no ground-fault monitoring, and no communication function. For a line protection breaker in a main feeder position, the shunt trip gives you a remote open signal — useful for emergency-stop circuits or PLC-based load shedding.