{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C4034A400","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C4034A400","canonicalUrl":"https://aoctrl.com/schneider/C4034A400","factsUrl":"https://aoctrl.com/api/mcp/products/C4034A400","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric, ComPacT NSX400...630, MicroLogic 4.3 AL electronic trip unit, 400 A at 40 °C, 3-pole, LSoI protection with integrated earth-leakage Class A.","salesMarkdown":"The C4034A400 is a Schneider Electric MicroLogic 4.3 AL electronic trip unit for the ComPacT NSX400...630 molded-case circuit breaker platform. It is rated 400 A at 40 °C, 3-pole with 3D protected poles, and carries LSoI protection functions — long-time (L), short-time short-circuit with fixed delay (So), and instantaneous (I) — plus integrated earth-leakage protection Class A. Built to EN/IEC 60947-2, this trip unit is the brain of the breaker: it measures current through the integral current transformers and decides when to signal the breaker to open. The long-time pick-up Ir is adjustable from 160 to 400 A across nine settings, letting you match the cable or busbar ampacity without swapping the trip unit. The short-time pickup Isd adjusts from 1.5 to 10 x Ir, and the instantaneous pickup Ii is fixed at 4800 A — that is the hard floor for clearing a bolted fault. Earth-leakage sensitivity IΔn and time delay Δt are both adjustable, with delay options from 0 ms to 1 s for coordinating downstream with RCDs or upstream with a main breaker. ## Protection curve and selectivity The fixed long-time delay tr gives 11 s at 7.2 x Ir, 16 s at 6 x Ir, and 400 s at 1.5 x Ir — these are the curves that govern motor start and transformer inrush ride-through. Zone selective interlocking (ZSI) is not fitted on this unit, so selectivity with downstream breakers relies on time-current curve grading alone. For a panel where ZSI is required for faster fault clearing, the MicroLogic 5.3 or 6.3 series with ZSI option would be the next step up. ## Integration notes This trip unit snaps into the ComPacT NSX400...630 fixed breaker. It is IP40 rated (IEC 60529), so it is suited for panel interiors where the enclosure door provides the environmental seal. The local signalling panel shows a flashing green LED for ready, red LED at 105 % Ir for overload, orange LED at 90 % Ir for pre-alarm, and a yellow indicator for residual current. Earth-leakage protection can be disabled via the IΔn rotary switch — useful during commissioning or when feeding a transformer that has its own earth fault protection.","metaTitle":"Schneider Electric C4034A400 ComPacT NSX MicroLogic 4.3 AL T","metaDescription":"Schneider Electric C4034A400 trip unit, 400 A at 40 °C, MicroLogic 4.3 AL electronic protection with integrated earth-leakage (Class A). EN/IEC 60947-2. Sourced to order against RF","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Range":"ComPacT","title":"C4034A400","Standards":"EN/IEC 60947-2","description":"Trip unit MicroLogic Vigi 4.3AL, ComPacT NSX400/630, 3 poles, electronic basic protections, earth leakage alarm, 400A","Network type":"AC","Thermal memory":"20 minutes before and after tripping","Trip unit name":"MicroLogic 4.3 AL","Protection type":"L : for overload protection (long time) So : for short time short-circuit protection with fixed delay I : for instantaneous short-circuit protection","lifecycle_stage":"current","Local signalling":"Flashing LED (green) for ready to operate LED 105 % Ir (red) for overload LED 90 % Ir (orange) for overload Color indicator (yellow) for residual current","Pollution degree":"3 conforming to IEC 60947-1","Range of product":"ComPacT NSX400...630","Trip unit rating":"400 A at 40 °C","Network frequency":"50/60 Hz","Poles description":"3P","Device application":"Distribution","Trip unit technology":"Electronic","IP degree of protection":"IP40 conforming to IEC 60529","Earth-leakage protection":"Integrated","Product or component type":"Trip unit","Protected poles description":"3D","Circuit breaker mounting mode":"Fixed","Earth-leakage protection class":"Class A","Trip unit protection functions":"LSoI","[Ue] rated operational voltage":"440 V AC 50/60 Hz","Zone selective interlocking ZSI":"Without","Electrical shock protection class":"Class II","Ambient air temperature for storage":"-50...85 °C","Ambient air temperature for operation":"-25...70 °C","Earth-leakage protection specific mode":"OFF using the IΔn rotary switch","Long-time protection delay adjustment type tr":"Fixed","Short-time protection delay adjustment type tsd":"Fixed","[Tr] Long-Time Protection Delay Adjustment Range":"11 s at 7.2 x Ir 16 s at 6 x Ir 400 s at 1.5 x Ir","Short-time protection pick-up adjustment type Isd":"Adjustable","[Ir] long-time protection pick-up adjustment range":"160...400 A","Instantaneous protection pick-up adjustment type Ii":"Fixed","[Isd] Short-time protection pick-up adjustment range":"1.5...10 x Ir","[Ii] instantaneous protection pick-up adjustment range":"4800 A","Earth-leakage protection sensitity adjustment type IΔn":"Adjustable","Earth-leakage protection time delay adjustement type Δt":"Adjustable","Long-time pick-up adjustment type Ir (thermal protection)":"Adjustable 9 settings","[Δt] Earth-leakage protection time delay adjustment range":"0 ms 60 ms 150 ms 500 ms 1 s","[IΔn] earth-leakage protection sensitivity adjustment range":"0.3 A 0.5 A 1 A 3 A 5 A 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$16.17","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/12e8e5b32e5c55b0dd5743aac427f118.pdf","sourceUrl":"https://www.se.com/th/en/product/C4034A400/trip-unit-micrologic-vigi-4-3al-compact-nsx400-630-3-poles-electronic-basic-protections-earth-leakage-alarm-400a/"},"ai":{"faq":[{"question":"How do I get current pricing and availability for C4034A400?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time — we source through independent distribution channels."},{"question":"What is the closest alternative to C4034A400 in the ComPacT family?","answer":"Within the same ComPacT NSX400...630 frame, the MicroLogic 5.3 A or 6.3 A trip units add zone selective interlocking (ZSI) and additional protection functions. They share the same physical footprint and wiring harness."},{"question":"What standards does C4034A400 comply with?","answer":"It complies with EN/IEC 60947-2 for low-voltage switchgear and controlgear. It also carries IEC 60529 IP40 and IEC 60947-1 pollution degree 3 ratings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C4034A400","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/C4034A400 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}