Integrator’s note — 400 A, 4-pole, 96 W max loss
The Siemens SENTRON 3VA2340-5HN42-0AG0 is a 4-pole molded case circuit breaker rated for 400 A continuous current (Iu) at ambient temperatures up to 50 °C without derating — at 55 °C it still holds 385 A, dropping to 340 A at 70 °C. Breaking capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. That SCCR headroom covers most fault-current scenarios in industrial distribution without needing a current-limiting fuse upstream. The ETU350 electronic trip unit provides adjustable overload and short-circuit protection curves — no undervoltage release, no ground-fault monitoring, no communication module. The auxiliary contact set is 1 NO/NC plus 1 trip alarm switch (HP type). Power dissipation maxes at 96 W; in a sealed enclosure that heat load needs accounting for in the thermal budget.
Lifecycle & sourcing posture
The 3VA2340-5HN42-0AG0 is marked as current production — no phase-out or last-time-buy notice. It is quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.