What the ratings mean for fit
The 3VA2340-5HN32-0DF0 is a 3-pole IEC frame 400 molded-case circuit breaker with a 55 kA breaking capacity at 415 V (class M). That Icu rating means it can safely interrupt a fault up to 55 kA without welding or rupturing — critical for high-fault installations like transformer secondaries or large motor control centers. The ETU350 electronic trip unit gives LSI protection: long-time (Ir) adjustable 160–400 A, short-time (Isd) 1.5–10 x Ir, and instantaneous (Ii) fixed at 10 x In. This selectivity profile suits it as a main or feeder breaker in a distribution panel where you need coordination with downstream devices.
Built-in accessories and deployment context
This order code includes a factory-fitted undervoltage release (208–230 V AC, 50/60 Hz), a nut keeper kit, one auxiliary switch (changeover H), and one trip alarm switch (changeover). The undervoltage release automatically trips the breaker when control voltage drops below about 70% of rated — typical for emergency-stop circuits or mains-loss protection. The auxiliary and alarm switches feed status back to a PLC or indicator panel. The nut keeper kit simplifies panel mounting on a DIN rail or backplate; no loose hardware to lose during installation.