The Siemens 3VA2340-5HN32-0BF0 is a 3-pole IEC frame 400 molded case circuit breaker with breaking capacity class M, rated Icu=55kA @ 415V. It carries an ETU350 LSI trip unit, adjustable overload protection Ir from 160A to 400A, short-circuit protection Isd from 1.5 to 10 x Ir, and instantaneous Ii fixed at 10 x In. An undervoltage release (24V DC), one auxiliary switch HQ, and one trip alarm switch HQ are integrated. The nut keeper kit is included for secure mounting.
What the ratings mean for your panel
The 55kA Icu at 415V means this breaker can safely interrupt fault currents up to that level without failure — critical for high-fault-capacity installations like transformer secondaries or large motor control centers. The ETU350 LSI trip unit gives you selective coordination: adjust the long-time (Ir) for cable protection, short-time (Isd) for downstream breaker selectivity, and instantaneous (Ii) for bolted faults. The 24V DC undervoltage release ensures the breaker trips on loss of control voltage, meeting safety disconnection requirements in emergency-stop circuits. The auxiliary and alarm switches feed status back to a PLC or indication lamp.