{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C4037A400","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C4037A400","canonicalUrl":"https://aoctrl.com/schneider/C4037A400","factsUrl":"https://aoctrl.com/api/mcp/products/C4037A400","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NSX400...630, MicroLogic 7.3 E AL electronic trip unit, 400 A, 3P, LSI with integrated earth-leakage Class A, LCD display, EN/IEC 60947-2.","salesMarkdown":"The C4037A400 is a MicroLogic 7.3 E AL electronic trip unit from the ComPacT NSX400...630 range, rated 400 A at 40 °C for distribution applications. It packs LSI protection (long-time, short-time, instantaneous) with integrated earth-leakage protection Class A, all in a 3-pole (3D protected poles) package that fits fixed-mount ComPacT NSX breakers. The LCD display gives you local readout of metering, alarms, and event logs — no separate power meter needed on the door. If your panel runs hotter — say 50 °C inside the enclosure — you'll need to derate per the ComPacT curves, or step up to the next frame size. The Ir long-time pick-up is adjustable from 160 to 400 A, so you can dial in the exact cable or busbar rating without changing hardware. Short-time (Isd) and instantaneous (Ii) pick-ups are also adjustable: Isd from 1.5 to 10 x Ir, Ii from 1.5 to 12 x In. That range covers motor start inrush, transformer magnetizing, and selective coordination with downstream breakers. The short-time delay (tsd) can be set from 0 to 0.4 s with I²t on or off — use I²t on for cable protection, off for generator or busway coordination where you need a flat time band. The IΔn rotary switch lets you disable it (OFF position) if the downstream circuit already has its own RCD, but having it built in saves a separate toroid and relay in the panel. If you re-close quickly on a still-hot circuit, the trip curve shifts to account for the residual heat — no nuisance re-trip on a warm restart, and no waiting for the conductor to cool before re-energizing. This trip unit mounts into ComPacT NSX400, NSX630, and NSX400...630 fixed-mount circuit breakers. The 3-pole (3D protected) form factor matches the standard NSX frame; the LCD display and pushbuttons are accessible through the breaker's front cover once installed. IP40 per IEC 60529 keeps out tools and wires larger than 1 mm — fine for a clean indoor panel, but if the breaker lives in a washdown area or outdoors, you'll need the IP54 or IP55 shrouded version of the NSX frame. The 50/60 Hz network frequency and 440 V AC rated voltage suit standard low-voltage distribution in North America (480Y/277 V) and Europe (400/230 V) alike.","metaTitle":"C4037A400 MicroLogic 7.3 E AL Trip Unit, 400 A, ComPacT NSX","metaDescription":"C4037A400 MicroLogic 7.3 E AL electronic trip unit for ComPacT NSX400-630. 400 A, LSI protection, integrated earth-leakage Class A, LCD display. EN/IEC 60947-2. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Range":"ComPacT","title":"C4037A400","Standards":"EN/IEC 60947-2","description":"Trip unit MicroLogic Vigi 7.3E AL, ComPacT NSX400/630, 3P, basic protections, earth leakage alarm, energy meter, 400A","Display type":"LCD display","Network type":"AC","Thermal memory":"20 minutes before and after tripping","Trip unit name":"MicroLogic 7.3 E AL","Protection type":"L : for overload protection (long time) S : for short time short-circuit protection 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","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","Type of measurement":"Energy meter","Trip unit technology":"Electronic","Communication of data":"Maintenance indicators Instantaneous and demand values Time-stamped histories and event tables Power quality Energy metering Test reports Maximeters/minimeters Demand current and power Earth leakage current Protection and alarm settings","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":"LSI","[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":"-40...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":"Adjustable","Short-time protection delay adjustment type tsd":"Adjustable","[Tr] Long-Time Protection Delay Adjustment Range":"15...400 s at 1.5 x Ir 0.35...11 s at 7.2 x Ir 0.5...16 s at 6 x Ir","Short-time protection pick-up adjustment type Isd":"Adjustable","[Ir] long-time protection pick-up adjustment range":"160...400 A","[tsd] Short-time protection delay adjustment range":"0...0.4 s I²t=off 0.1...0.4 s I²t=on","Instantaneous protection pick-up adjustment type Ii":"Adjustable","[Isd] Short-time protection pick-up adjustment range":"1.5...10 x Ir","[Ii] instantaneous protection pick-up adjustment range":"1.5...12 x In","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":"$22.63","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ceae6461f6875233596ccdbb1f055b21.pdf","sourceUrl":"https://www.se.com/ie/en/product/C4037A400/trip-unit-micrologic-vigi-7-3e-al-compact-nsx400-630-3p-basic-protections-earth-leakage-alarm-energy-meter-400a/"},"ai":{"faq":[{"question":"What standards does C4037A400 comply with?","answer":"The C4037A400 complies with EN/IEC 60947-2, the standard for low-voltage switchgear and controlgear circuit breakers. Pollution degree 3 per IEC 60947-1 and IP40 per IEC 60529 are also met."},{"question":"What is the closest alternative to C4037A400 in the ComPacT family?","answer":"The closest sibling is the MicroLogic 7.3 E (without the AL suffix), which omits the integrated earth-leakage protection. If you need earth-leakage, the C4037A400 is the correct choice; if not, the 7.3 E saves cost. Both share the same LSI protection curves, LCD display, and 400 A rating."},{"question":"Where can I buy C4037A400 and how is it quoted?","answer":"We source and quote the C4037A400 to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C4037A400","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/C4037A400 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}}