What the ratings mean for fit
The Siemens 3VA2325-7HM42-0AA0 is a 4-pole SENTRON molded case circuit breaker rated for 250 A continuous current (Iu) across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. The ETU330 electronic trip unit gives you adjustable long-time delay (tr) from 0.5 to 17 s and N-conductor protection that can be set to OFF, 50%, or 100% of the phase current, which matters for 4-wire systems where the neutral must be switched and protected independently. Breaking capacity hits 330 kA at 240 V and 242 kA at 415/440 V, dropping to 187 kA at 500 V and 7.5 kA at 690 V — so on a 480 V distribution panel the SCCR headroom is substantial, but at 690 V the fault-clearing capability narrows to a level that still covers most industrial motor-drive branches.
Panel integration and approvals
Mounts in a standard panel footprint: 248 mm tall, 184 mm wide, 110 mm deep. Front protection is IP40 — suitable for enclosed distribution boards, not for washdown zones. The latching endurance is rated at 20 000 cycles, which covers frequent switching in motor-control centers. Rated insulation voltage Ui is 800 V, so the breaker can be applied on 690 V line-to-line systems within the reduced breaking capacity.