Siemens SENTRON 3VA2225-7HL32-0JC0 — 250 A MCCB with ETU320 Trip Unit
It carries a breaking capacity of 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 6.3 kA at 690 V — figures that define its fault-interruption capability at each voltage level, not a single headline number. The ETU320 release provides adjustable long-time, short-time, and instantaneous protection curves, giving the specifying engineer selectivity tuning that a fixed thermal-magnetic trip cannot match.
Temperature Derating and Panel Integration
Derating begins at 55 °C (241 A), dropping to 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. For a panel-builder laying out a 250 A feeder in a non-air-conditioned enclosure, the 55 °C threshold is the first point where the nameplate current no longer applies — factor the derating into the bus and lug sizing.