The Siemens 3VA1140-5EF42-0AA0-ZD00 is a 4-pole IEC frame 160 molded-case circuit breaker in the 3VA1 series, carrying a 55 kA Icu at 415 V (breaking capacity class M). The TM240 thermal-magnetic trip unit is set for a 40 A fixed rating, with overload protection adjustable from 28 A to 40 A and short-circuit pickup from 5 to 10 times In. The neutral conductor is unprotected on this variant, and the assembly includes a nut keeper kit for DC Power OEM installations in China.
What the ratings mean for fit
The 55 kA Icu at 415 V is the ultimate breaking capacity — the breaker can safely interrupt a fault current up to that level once without needing replacement. For a 40 A line protection feeder in a 415 V panel, that SCCR headroom covers most industrial fault scenarios. The adjustable Ir (28–40 A) lets you fine-tune the overload threshold to the actual load, while the Ii range (5–10× In = 200–400 A) sets the instantaneous magnetic trip for motor-start or inrush-heavy circuits. The unprotected neutral means the neutral conductor passes through without overcurrent protection — typical for balanced three-phase loads where the neutral carries only imbalance current.
Deployment context
This breaker mounts in a standard IEC distribution panel or switchboard. The nut keeper kit is a fitment detail for DC Power OEM builds in China — it retains the mounting nuts during assembly, saving time on the line.