What the Ratings Mean for Fit
The 3VA2325-5HN32-0CL0: The 250 A rating holds flat from 40 °C through 50 °C, then derates to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. That thermal curve means the breaker carries its full nameplate in most ventilated enclosures; only above 50 °C ambient does the continuous current need adjustment, and the drop is gradual enough to plan around without oversizing. Rated insulation voltage Ui is 800 V, so the breaker's internal clearances and creepage are designed for 690 V line-to-line systems with margin. The ETU350 trip unit provides electronic long-time, short-time, instantaneous, and ground-fault protection curves — programmable selectivity for a distribution panel feeding motor control centers or transformer-coupled loads. The auxiliary contact configuration — 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ — gives the panel builder enough dry contacts for remote status, trip indication, and a separate alarm signal without adding an external interface module. The undervoltage release (UVR) is factory-fitted, so the breaker drops out on loss of control voltage, which is standard for emergency-stop circuits and safety-related disconnect schemes. Power loss is rated at a maximum 40 W. In a densely packed distribution panel, that figure matters for thermal management — it's not negligible, so keep ventilation slots clear and avoid stacking breakers directly above without a baffle.
Deployment Context
This MCCB is a panel-mount device sized for distribution boards and motor control centers. Its dimensions — 110 mm depth, 138 mm width, 248 mm height — fit standard Siemens SENTRON mounting footprints, so it swaps into an existing 3VA panel cutout without re-drilling the backplate. The 3-pole form factor suits three-phase feeders, main incomers, or large motor branch circuits.