What this MCCB carries — and where it sits
The Siemens SENTRON 3VA2325-6HN32-0JA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed until you push past 70 °C, which is the operating max. That 250 A holds flat from 40 °C through 70 °C, so it's sized for a warm panel without headroom games. Interrupting capacity is the headline: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. That 242 kA at 240 V tells you this breaker is built for high-fault industrial feeds — think transformer secondaries or large motor control centers where the available fault current is serious. The 690 V rating drops to 7.5 kA, which is still adequate for most 690 V distribution but worth noting if you're near a large transformer.
Panel fit — the 110 mm depth matters
Footprint: 138 mm wide, 248 mm tall, 110 mm deep. The 110 mm depth is the dimension that catches people — it's deeper than a typical IEC MCB, so check your enclosure gland plate clearance and any back-mounted busbars. Width at 138 mm fits a standard 3-pole MCCB cutout; height at 248 mm means it clears most 300 mm tall enclosures but verify against your backpan layout. This is a line-protection design (not motor-protection curve), so it's intended for feeder and distribution duty. The shunt trip (STL) auxiliary release is built in — that's the entry — meaning you can remote-trip it from an E-stop or safety relay without adding an external undervoltage module. No undervoltage release fitted as standard, so if you need UVR for anti-restart, that's a separate add-on.
Lifecycle and sourcing posture
Power loss is 37.5 W maximum at rated load — factor that into your panel thermal budget if you're stacking multiple breakers in a sealed enclosure. Storage range is -40 °C to 80 °C, operating range -25 °C to 70 °C, so it handles cold warehouses and hot panels alike.