What this MCCB does for your panel
The Siemens SENTRON 3VA2225-7HL32-0CL0 is a 3-pole molded case circuit breaker rated for a continuous current of 250 A, built for line protection duty. It carries a massive 330 kA interrupting capacity at 240 V, dropping to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 6.3 kA at 690 V — so it handles high-fault scenarios on the low-voltage side of a transformer without breaking a sweat. The ETU320 electronic trip unit gives you adjustable overload and short-circuit protection curves, with a trip indicator that shows when it's opened on a fault. An undervoltage release is built in, so if the control voltage drops, the breaker drops out — good for motor circuits where you want a guaranteed stop on loss of control power. Out here in the grease, the -25 °C to 70 °C operating range means it'll sit in an unheated pump house or a hot panel next to drives and still hold its calibration. The 250 A rating holds flat from 40 °C to 50 °C, then derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C — so you've got headroom in a warm enclosure.
Panel fit and integration
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — that's a standard SENTRON 3VA footprint. It mounts on a DIN rail or can be screw-fixed to a backplate. The auxiliary contact block (2 aux switches + 1 trip alarm + 1 electrical alarm, HQ type) is integrated, so you get status feedback without an add-on module. Power loss maxes at 50.5 W — keep that in mind for enclosure thermal calculations, especially if you're grouping several breakers in a closed panel. Storage range is -40 °C to 80 °C, so it ships and sits on the shelf fine.