What this MCCB carries — and what it means for the panel
The Siemens SENTRON 3VA2463-5HN32-0CA0 is a 3-pole molded case circuit breaker rated for 630 A continuous current (Iu) at 40 °C, with an ETU350 electronic trip unit and an integrated undervoltage release (UVR). Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — figures that tell you this breaker is sized for high-fault utility feeds or large transformer secondaries where the available short-circuit current is substantial. The ETU350 release handles line protection (no ground-fault or communication module on this variant), and the undervoltage release drops the breaker when control voltage falls — a standard requirement for emergency-stop circuits and safety disconnects in many industrial codes. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a footprint that fits standard SENTRON 3VA panel cutouts and busbar systems, so it retrofits into existing switchboards without re-drilling the mounting plate.
Thermal derating — the real-world current you can actually run
The 630 A rating holds at 40 °C ambient. Above that, the breaker derates in 10 °C steps: 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, and 520 A at 70 °C. If your panel ambient runs 50 °C — common in a packed switchroom — you lose about 6 % of the nominal rating. Plan the load bus accordingly; the breaker won't trip on thermal overload at 593 A, but it also won't carry the full 630 A without nuisance tripping.
Lifecycle and sourcing posture
Maximum power loss is 164.5 W, which matters for enclosure thermal calculations — that heat has to be vented or the breaker derates further.
What it does not carry — and why that matters for spec review
This variant has no auxiliary contacts, no ground-fault monitoring, no communication function, no phase-failure detection, and no voltage trigger — it is a straight line-protection MCCB with undervoltage release only. The trip indicator is also absent, so there is no local mechanical flag showing the breaker tripped on fault versus manual off — something to note if your maintenance team relies on visual trip indication at the panel.
Operating and storage range
Operating temperature spans -25 °C to 70 °C; storage range is wider at -40 °C to 80 °C, which governs handling and warehousing, not running conditions. Mechanical endurance is rated at 15,000 latching operations.