What this MCCB carries — and what that means for the panel
The Siemens SENTRON 3VA2463-6JQ32-0HH0 is a 3-pole molded case circuit breaker rated for continuous current Iu of 630 A at 40 °C, with an insulation voltage Ui of 800 V. That 630 A figure is the thermal backbone — it governs the main bus connection and sets the upper bound for the downstream load schedule. The ETU560 electronic trip unit gives you adjustable overload and short-circuit protection curves, plus a communication function for status feedback over the network. Breaking capacity runs from 242 kA at 240 V down to 40 kA at 690 V, so the SCCR headroom is substantial for most industrial distribution panels.
Selectivity and thermal derating — the real coordination numbers
The 630 A rating holds only at 40 °C ambient. Above that, the continuous current derates linearly: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. If the panel ambient runs at 50 °C, this MCCB effectively becomes a 570 A device — that matters when you're coordinating with an upstream feeder breaker or sizing the busbar. Maximum power loss is 162 W, so ventilation inside the enclosure isn't optional; it's a thermal budget line item.
What the auxiliary contacts and releases tell you
The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) — that's enough for remote status indication on a PLC digital input card without adding external interface relays. The shunt trip release (STL) is built in, so a remote emergency-stop signal or undervoltage protection scheme can trip the breaker directly. Ground fault monitoring uses summation current formation on the L-conductor, which means it detects residual current without a separate core-balance CT — saves panel space and wiring. The trip indicator and voltage trigger are both present, so a local flag confirms the breaker opened on fault, not manual operation.
Physical fit and environmental limits
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint for 630 A frame size. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The 15 000 mechanical endurance cycles (latching) is typical for a 630 A electronic-trip MCCB — it's not a switching device for frequent motor starts, but it handles routine isolation and fault interruption without issue.