What this MCCB delivers
The Siemens SENTRON 3VA2325-6HL32-0AG0 is a 3-pole molded case circuit breaker rated for 250 A continuous current (Iu) with an ETU320 electronic trip unit. It's configured as a line-protection device, meaning it's tuned for feeder and main breaker duties rather than motor or generator protection — the trip curve and time delays are set for cable and busbar thermal limits. Breaking capacity is the headline: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and still 40 kA at 690 V. That's a very high-interrupting frame — it's sized for installations where fault current runs high, like large transformer secondaries or industrial substations. The 690 V rating matters for 600 V class North American systems and for 690 V European industrial grids. Current rating holds flat at 250 A from 40 °C up through 50 °C ambient. Derating starts at 55 °C (240 A), stepping down to 225 A at 70 °C. That's a solid thermal budget — most panel interiors stay below 50 °C, so you get full rating without a derate factor.
Trip unit and auxiliaries
The ETU320 is an electronic trip unit with LSI protection (long-time, short-time, instantaneous). It gives adjustable pickup and time-delay settings for selectivity coordination downstream — critical when you're cascading MCCBs in a distribution board and need the fault to clear at the closest device. Comes with one auxiliary switch and one trip-alarm switch (HP type) fitted. That's enough for remote status indication — open/closed on the aux, tripped on the alarm. No undervoltage release, no shunt trip, no ground-fault module on this variant; those are add-on options if needed. The basic switch assembly carries order code 3VA2325-6HL32-0AA0, and the integrated auxiliary trip module is 3VA9608-0BB11. If you're stocking spares, those are the sub-assembly references.
Panel fit and environment
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. That's a standard 3-pole MCCB footprint for this ampacity class — it fits SENTRON mounting plates and common DIN-rail adapters. The 110 mm depth is the projection from the mounting surface; plan for front-access cabling and clearance for the arc-chamber venting. Operating range is -25 °C to 70 °C ambient, storage from -40 °C to 80 °C. Maximum power loss is 37.5 W — not negligible in a sealed enclosure; factor it into the thermal calculation if the panel is IP54 or above. Rated insulation voltage (Ui) is 800 V. Mechanical endurance is 15,000 operations.