What it is and what it does
The Siemens SENTRON 3VA2325-6HN32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed for line protection in distribution panels where the fault current can hit 242 kA at 240 V, 187 kA at 415 V, and still 121 kA at 500 V. That SCCR headroom means it can be placed at the main feeder without worrying about cascading failure into downstream gear.
Key ratings and what they mean for fit
The 250 A continuous rating is flat from 40 °C through 70 °C — no thermal derating curve to calculate for a warm panel. The 242 kA interrupting rating at 240 V is the headline number, but the 187 kA at 415 V is the one that matters for 400 V-class installations: it safely clears faults up to that level without upstream coordination headaches. At 690 V the rating drops to 7.5 kA — still adequate for most motor-circuit faults but not for high-fault utility ties. The breaker ships with a shunt trip (STL) as the auxiliary release, plus 2 auxiliary switches and 1 trip alarm switch (HQ configuration). That gives remote tripping capability and status feedback without an add-on module. No undervoltage release is fitted — if UVR is needed, this order code doesn't carry it.
Where it goes in the panel
Footprint is 138 mm wide, 248 mm tall, 110 mm deep — a standard 3-pole MCCB form factor for DIN-rail or panel-mount installation. The 37.5 W maximum power loss at rated load matters for enclosure thermal budgeting: a sealed cabinet needs that heat accounted for in the ventilation or cooling design. Operating range is -25 °C to 70 °C; storage range -40 °C to 80 °C. That covers unconditioned electrical rooms and outdoor enclosures in most climates.