The Siemens 3VA1140-4GF42-0AA0-ZD00 is a 4-pole IEC molded-case circuit breaker in the 3VA1 frame, rated 40 A continuous with an interrupting capacity of 36 kA at 415 V (class S). It carries a TM240 thermal-magnetic trip unit — overload adjustable from 28 to 40 A (Ir), short-circuit pickup fixed at 5 to 10 times In. The N conductor is protected at 100% (full-rated neutral).
For a 40 A feeder on a 400 V three-phase system, that gives solid selectivity headroom against a 50 kA or 65 kA upstream device. The TM240 trip unit means the thermal element is calibrated for a 40 A frame; the Ir adjustment band (28–40 A) lets you fine-tune the overload setpoint to match the actual load current, which is useful when the conductor ampacity or transformer rating doesn't align with the breaker's In. The short-circuit magnetic pickup (Ii) at 5–10× In means the instantaneous trip fires between 200 and 400 A — that's a wide band, so coordinate downstream with a current-limiting fuse if the branch circuit has a low-fault transformer.
Deployment context
The nut keeper kit (part of the ZD00 suffix) is specified for DC Power OEM builds in China; it retains the terminal nuts during high-vibration transport or panel assembly.