Siemens SENTRON 3VA2340-5KP32-0JC0 — 400 A MCCB with ETU850
The Siemens SENTRON 3VA2340-5KP32-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with the ETU850 electronic trip unit providing line protection. It carries a 187 kA interrupting capacity at 240 V and 121 kA at 415 V — figures that tell you it can clear a major fault without upstream coordination issues in most low-voltage distribution panels. The 800 V rated insulation voltage (Ui) confirms it is suited for 480 V and 600 V class systems common in North American and European industrial plants.
Ratings and what they mean for your panel
The 400 A rating holds flat from 40 °C through 50 °C, then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your enclosure runs hot — say a packed MCC lineup near a furnace line — you need to factor that derating into the load schedule. The interrupting curve drops from 187 kA at 240 V to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 17 kA at 690 V. At 690 V it is still adequate for most motor circuits, but verify your available fault current against that 17 kA ceiling. The ETU850 release is a communicating electronic trip unit — the listing shows a communication function and other measurement function present, meaning it can feed power-quality data upstream via the SENTRON communication bus. That is useful for a facility energy management system, but it also means the breaker draws power for the electronics: 96 W maximum power loss, which contributes to the enclosure thermal budget. The shunt trip (STL) auxiliary release allows remote tripping from a safety PLC or E-stop circuit.
Physical fit and panel integration
Dimensions: 248 mm height, 138 mm width, 110 mm depth. That 138 mm width is the standard 3-pole MCCB footprint for the SENTRON 3VA platform — it occupies three 45 mm-wide module positions on a DIN rail or mounting plate. The 110 mm depth means it clears most 200 mm deep enclosures with room for wiring gutters. The two HQ auxiliary switches (2 auxiliary switches HQ) are integrated into the breaker body, not add-on modules, so no extra depth for a side-mount block.
What is included and what is not
The breaker ships with the ETU850 trip unit, shunt trip (STL), and 2 HQ auxiliary switches. It does not include an undervoltage release, ground fault monitoring, or phase failure detection — those are separate accessory modules if your application requires them. No trip indicator on the front face; the ETU850 communicates status via the bus. Operating temperature range is -25 °C to 70 °C, storage -40 °C to 80 °C.