The 3VA1140-3EF42-0AA0-ZD00 is a Siemens 3VA1 IEC frame 160 molded case circuit breaker (MCCB) with a 4-pole configuration, rated for line protection. Its breaking capacity class N delivers an Icu of 25kA at 415V AC, which means it can safely interrupt fault currents up to that level on a 415V line without welding contacts or cascading failure upstream — a key figure for panel coordination studies. The TM240 thermal-magnetic trip unit provides adjustable overload protection (Ir) from 28A to 40A, with a fixed In of 40A. Short-circuit protection (Ii) is adjustable between 5 and 10 times In, so you can set it to ride through motor inrush or tighten it for feeder protection. The N conductor is unprotected on this variant, meaning the neutral pole has no trip element — common on 3-phase + N distribution where the neutral is not expected to carry fault current. This specific order code includes a nut keeper kit and is designated for DC Power OEM in China — the kit keeps hardware captive during panel assembly, a detail that matters if you're building pre-wired DC power distribution sections.
Deployment Context
The 3VA1 frame mounts in a standard panel or enclosure on a DIN rail or bolted directly to a mounting plate — the nut keeper kit simplifies captive fastening for OEM production runs. The 4-pole form factor suits 3-phase + N distribution boards or DC power distribution where a switched neutral is required.