SENTRON 3VA2325-5HN32-0KH0 — 250 A MCCB with ETU350
The Siemens 3VA2325-5HN32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current, 3-pole, configured for line protection with an ETU350 electronic trip unit. It carries a shunt trip release (STL) and is fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). The interrupting ratings are 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — numbers that define the available fault current it can safely clear at each voltage level without upstream coordination failure. The 250 A rating holds flat from 40 °C through 50 °C; above that it derates to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. If the panel ambient runs hot, the continuous current capability drops — size the breaker for the actual enclosure temperature, not the nameplate 250 A. Dimensions are 248 mm high × 138 mm wide × 110 mm deep. It mounts on a DIN rail or directly to a backplate in a distribution panel. The ETU350 release is field-configurable for long-time, short-time, instantaneous, and ground-fault pickup — though this unit ships without ground-fault monitoring (the 'Without' flag on that option).
Selectivity and Coordination Notes
Rated insulation voltage Ui is 800 V, so the breaker is suitable for 690 V line-to-line systems with margin. The 187 kA SCCR at 240 V is typical for a high-interrupting-frame MCCB — it can sit upstream of smaller branch breakers in a panelboard without needing a current-limiting fuse ahead of it, provided the available fault current at that point is under 187 kA. At 690 V the rating drops to 17 kA, which still covers most industrial 690 V distribution but not high-fault locations. The shunt trip (STL) allows remote tripping from an E-stop or PLC output. The auxiliary switch block reports open/closed status and the alarm switch signals a trip event — useful for a BMS or SCADA input. No undervoltage release, no communication module, no phase-failure detection on this variant; those functions would require a different order code or add-on modules.