Line protection with ETU850 — 400 A continuous, 187 kA interrupting
The Siemens SENTRON 3VA2340-5KP32-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty. It carries a rated continuous current Iu of 400 A at 40 °C and holds the full 400 A through 50 °C before derating begins — at 55 °C it's 375 A, at 65 °C it's 325 A, and at 70 °C it's 300 A. The interrupting capacity reaches 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 187 kA at 240 V figure is the headline — it clears very high available fault currents typical in large distribution switchboards without cascading upstream breakers. The overcurrent release is an ETU850 electronic trip unit. Communication function is present on this variant, and an undervoltage release (UVR) is integrated — designated as 3VA9608-0BB25 for the auxiliary trip component. The rated insulation voltage Ui is 800 V. Maximum power loss is 98.5 W. This is a current-production part (lifecycle stage marked as active). It's sourced to order against an RFQ through independent distribution channels — pricing and availability confirmed at quote time.
Integration into a panel — dimensions and mounting
Physical footprint: 138 mm wide, 248 mm high, 110 mm deep. The 138 mm width is the standard 3-pole MCCB form factor for this SENTRON frame — it occupies three adjacent 45 mm-wide module positions on a DIN rail or panel-mount plate. The 110 mm depth means it fits within a 200 mm deep enclosure with clearance for rear busbars and wiring gutters. No auxiliary contact version is fitted on this order code (the slot is available). Trip indicator is not present on the front bezel — the ETU850 display provides fault indication via the communication interface. Phase failure detection is not a function of this release; it relies on the ETU's internal algorithms for phase imbalance.
Environmental limits and storage
Operating temperature range is -25 °C to 70 °C. Storage range is wider: -40 °C to 80 °C, which governs handling during shipping and warehouse staging, not running duty. The latching endurance is rated at 15,000 operations — this is the mechanical life under normal switching, not short-circuit fault interruption.