The SENTRON 3VA2340-5KP42-0JC0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a full 400 A continuously at ambient temperatures up to 50 °C — no derating needed in a warm panel. Above that, it steps down in 25 A increments to 300 A at 70 °C, so if your enclosure sits near a heat source or in a non-climate-controlled room, check the thermal curve before locking in the BOM.
Breaking capacity — what it means for your fault bus
This breaker delivers 187 kA at 240 V, 121 kA at 415 V, and still 55 kA at 440 V — numbers that put it in the high-interrupting class for industrial switchboards where fault current can stack from multiple transformers or parallel feeders. At 690 V it still holds 7.5 kA, enough for most 690 V motor circuits downstream of a step-up transformer. The ETU850 electronic trip unit gives you adjustable LSI protection (long-time, short-time, instantaneous) plus ground-fault alarm capability — the kind of selectivity you need to keep a lighting panel from tripping when a motor feeder clears a bolted fault.
Fit and panel integration
Mounts on a standard DIN rail or bolts directly into a switchboard cradle. The 184 mm width × 248 mm height × 110 mm depth footprint matches the 3VA2 platform, so if you're replacing a failed unit or adding a feeder in an existing SENTRON lineup, the bus-bar centers and terminal positions line up without re-drilling the backplate. Comes with 2 auxiliary switches (HQ type) and a shunt trip (STL) pre-installed — no field-kit wiring for remote tripping or status feedback. The front face is IP40 rated, enough for a clean indoor panel; keep it out of washdown zones unless you add a cover.