What this order code delivers
The Siemens 3VA2340-5HL32-0HK0 is a 3-pole IEC molded-case circuit breaker in the 3VA2 frame, sized for line protection with an ETU320 LI electronic trip unit. Rated In=400A with adjustable overload protection Ir=160...400A and short-circuit protection Ii=1.5...10 x In, it carries a breaking capacity class M rated Icu=55kA at 415V AC — sufficient for most industrial distribution panels where fault levels sit in the 50 kA range. The order code includes a left-side shunt trip (24 V AC 50/60 Hz / 24-30 V DC), one auxiliary switch changeover H, one trip alarm switch changeover, and one electrical alarm switch HQ, plus a nut keeper kit.
What the ratings mean for panel integration
The Icu=55kA @ 415V rating tells you this breaker can safely interrupt a fault current up to 55 kA without welding contacts or rupturing the case — critical for selectivity studies where the upstream device must see the fault and let the downstream breaker clear it. The ETU320 LI trip unit provides adjustable long-time (overload) and instantaneous (short-circuit) protection curves, letting you coordinate with downstream breakers or motor starters. The integrated shunt trip on the left side accepts 24 V AC or 24-30 V DC, so a remote emergency-stop or PLC-based trip signal can open the breaker without a separate contactor. The auxiliary switch (changeover H) and trip alarm switch (changeover) give the control system status feedback — useful for a BMS or SCADA input.