630 A MCCB with ETU350 — what the ratings mean for your panel
The Siemens SENTRON 3VA2463-7HN32-0BL0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 630 A at 40 °C and an insulation voltage Ui of 800 V. The headline breaking capacity hits 330 kA at 240 V AC, stepping down to 242 kA at 415/440 V, 187 kA at 500 V, and 52.5 kA at 690 V — these figures define the maximum fault current the breaker can safely interrupt at each voltage level, which is the primary number for selectivity studies and SCCR compliance on a distribution board. The ETU350 electronic trip unit provides adjustable overload and short-circuit protection curves, giving the site engineer flexibility to coordinate downstream breakers. An integrated undervoltage release (UVR) trips the breaker when control voltage drops — standard for emergency-stop circuits or undervoltage protection schemes. The auxiliary contact block ships with 2 auxiliary switches plus 1 trip alarm and 1 electrical alarm switch (HQ type), enough for remote status indication without adding a separate module. Power loss is rated at 164.5 W maximum — factor that into enclosure thermal calculations, especially in a densely packed switchboard. Operating temperature spans -25 °C to 70 °C, with the current derating curve published from 40 °C upward (612 A at 45 °C, 593 A at 50 °C, down to 520 A at 70 °C). Storage range is wider at -40 °C to 80 °C.
Lifecycle and sourcing — current production, quoted to order
The basic switch (the breaker without auxiliaries) is order code 3VA2463-7HN32-0AA0, and the integrated auxiliary trip module is 3VA9608-0BB11 — useful references if you need to source the base unit separately or replace the UVR module.
Panel integration — footprint and mounting
Dimensions are 248 mm high × 138 mm wide × 110 mm deep. The breaker mounts on a DIN rail or can be screw-fixed to a backplate in a distribution panel. At 630 A frame size, verify busbar spacing and cable bending radius against the 110 mm depth — the line and load terminals need clearance for lugged conductors.
Selectivity and coordination — what the breaking capacities tell you
With 330 kA at 240 V and 242 kA at 415 V, this MCCB can serve as the main incoming breaker on a high-fault-current distribution board, provided the upstream transformer and cable impedances keep the prospective fault current below those thresholds. The 52.5 kA rating at 690 V is relevant for 690 V industrial networks (mining, marine, heavy industry). For selectivity studies, the ETU350's adjustable I²t and short-time delay settings allow coordination with downstream MCCBs and MCBs.