What this MCCB is and what the ratings mean for fit
The Siemens SENTRON 3VA2325-5HN42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with the same 250 A rating holding steady all the way up to 70 °C — no derating curve to chase across the typical panel ambient range. Breaking capacity is voltage-dependent: 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. That 121 kA at 415 V tells you this breaker handles high-fault utility feeds or transformer secondaries without cascading upstream — it's sized for main or large feeder duty, not branch protection. The ETU350 electronic trip unit gives adjustable overload and short-circuit protection curves, suited for line protection of cables and busbars rather than motor or generator circuits. No undervoltage release, no ground-fault monitoring, no communication module on this variant — it's a straightforward thermal-magnetic replacement with electronic precision.
Panel integration and physical fit
Dimensions are 248 mm high × 184 mm wide × 110 mm deep. The 184 mm width for a 4-pole frame is standard for this class — verify gland-plate cutout and adjacent device spacing before committing the panel layout. IP40 on the front means tools and fingers are protected, but the breaker is not sealed against washdown or dust ingress. Mount it inside a rated enclosure if the environment is wet or dusty. Maximum power loss is 37.5 W — account for this in enclosure thermal calculations, especially in a densely packed panel.
Lifecycle and sourcing posture
Operating temperature range is -25 °C to +70 °C; storage from -40 °C to +80 °C. The storage minimum is the one that matters for cold warehouses — the breaker can sit at -40 °C without damage, but don't energize it below -25 °C.