The Siemens 3VA1340-7FF42-0AA0 is a 4-pole IEC molded case circuit breaker from the 3VA1 series, frame size 400, rated at 400 A continuous. Its headline breaking capacity is 110 kA at 415 V AC — that is the Icu (ultimate short-circuit breaking capacity) in the C breaking class, meaning it can safely interrupt a fault current up to 110,000 A without damage to the breaker itself. For a panel builder or site engineer, that level of SCCR headroom covers most industrial distribution boards fed from a transformer of 1,000 kVA or larger, and it simplifies coordination with downstream devices because the upstream breaker won't limit the let-through energy you need to calculate.
Trip unit and protection settings
The TM240 ATAM thermal-magnetic trip unit gives you an adjustable overload protection band from 280 A to 400 A (Ir), and a short-circuit pickup (Ii) adjustable from 5× to 10× In — so from 2,000 A to 4,000 A. That range lets you dial in the magnetic threshold to ride through motor inrush on a 300 A pump feeder while still clearing a bolted fault fast. The neutral conductor protection is set at 0.5× In, and the breaker ships with a nut keeper kit for secure terminal tightening.
Compliance and regulatory documentation
RoHS compliant since 01-Nov-2017. REACH Article 33 disclosure notes lead (CAS 7439-92-1) above 0.1% w/w in the candidate list. Export control is AL: N / ECCN: N, so no special licensing for standard industrial destinations. The product family is the 3VA Molded Case Circuit Breakers up to 1600 A, IEC, which carries IEC 60947-2 certification — the standard that governs the 110 kA Icu rating and the thermal-magnetic trip performance.