The Siemens 3VA2340-5HN32-0LL0 is a 3-pole IEC frame 400 molded-case circuit breaker rated for line protection. It carries a 400 A continuous current rating (In) with an ETU350 LSI trip unit that provides adjustable overload (Ir from 160 A to 400 A) and short-time (Isd 1.5–10 x Ir) plus instantaneous (Ii fixed at 10 x In) protection. The breaking capacity class M delivers Icu = 55 kA at 415 V AC — sufficient for high-fault utility or transformer-fed panels where upstream coordination demands a robust interrupting rating.
What the ratings mean for fit
The 400 A frame and 55 kA Icu at 415 V place this breaker in the main or large-feeder position in a low-voltage switchboard. The ETU350 electronic trip offers LSI curves, meaning it can discriminate with downstream breakers on short-time delay — critical for selective coordination in a plant power system. The nut keeper kit (included) secures the breaker on the mounting plate under vibration; the universal release 24 V DC accessory allows remote tripping from a PLC or safety relay, which fits SIS architectures where a fail-safe shunt trip is needed.