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).
What the ratings mean for fit
The 36 kA Icu at 415 V places this breaker in the S breaking capacity class — it can safely interrupt faults up to that level without upstream fusing. 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
Mounts in a standard panel on a DIN rail or direct-screw base — the 3VA1 frame accepts plug-in accessories (aux contacts, shunt trip, undervoltage release) that snap into the left accessory slot without removing the breaker. 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.