What the ratings mean for fit
The Siemens SENTRON 3VA2325-5HL32-0KH0 is a 3-pole molded case circuit breaker rated for 250 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel thermal budgeting. Its interrupting capacity hits 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 500 V; at 690 V it still holds 7.5 kA. That 187 kA figure at 240 V means it can clear a fault on a high-capacity transformer secondary without the breaker welding open — a real concern on large commercial or industrial services. The breaker is designed for line protection (cable/feeder protection), not motor or generator duty, so the trip curve is set for overcurrent and short-circuit on distribution circuits. It carries a shunt trip release (STL) for remote opening and a complement of 2 auxiliary switches plus 1 trip alarm switch (HQ), giving status feedback for PLC or SCADA monitoring.
Panel integration and mounting
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep — a standard footprint for a 250 A frame MCCB in the SENTRON range. It mounts directly onto a DIN rail or can be screw-fixed to a backplate; the 138 mm width means it occupies three pole spaces on a DIN-rail assembly. The shunt trip and auxiliary switch wiring exits through the front face, so leave clearance for the cable bend radius. Maximum power dissipation is 37.5 W at full load — account for that heat in the enclosure ventilation, especially if multiple breakers are ganged.