{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C4044B400","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C4044B400","canonicalUrl":"https://aoctrl.com/schneider/C4044B400","factsUrl":"https://aoctrl.com/api/mcp/products/C4044B400","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NSX400...630, MicroLogic 4.3 AB electronic trip unit, 400 A at 40 °C, 4P, integrated earth-leakage protection, EN/IEC 60947-2.","salesMarkdown":"The C4044B400 is a MicroLogic 4.3 AB electronic trip unit for the ComPacT NSX400...630 range, rated 400 A at 40 °C. It sits in a 4P fixed-mount breaker and carries integrated earth-leakage protection (Class A). The EN/IEC 60947-2 standard governs its short-circuit and coordination performance — that's the standard for low-voltage switchgear and controlgear, so the unit is designed for selective coordination in distribution panels. The long-time pickup (Ir) is adjustable from 260 to 400 A — that's the overload threshold. Short-time pickup (Isd) adjusts 1.5 to 10 x Ir, giving you a wide band for motor or feeder coordination. Instantaneous pickup (Ii) is fixed at 4800 A, which means it clears hard faults above that level without delay. Earth-leakage sensitivity (IΔn) and time delay (Δt) are both adjustable via the rotary switch on the front face. You can set neutral protection to 0.5 x Ir (3D + N/2), 1 x Ir (4D), or no protection (3D) — the protected poles description matches: 3D + N/2, 4D, or 3D. ## Integration notes — panel fit and wiring Fixed-mount breaker, 4P, neutral on the left. Pollution degree 3 per IEC 60947-1 — that's the typical industrial environment with conductive pollution, so no extra conformal coating needed in a standard IP40 enclosure. Network frequency is 50/60 Hz, rated operational voltage 440 V AC.","metaTitle":"Schneider Electric C4044B400 ComPacT NSX Trip Unit, MicroLog","metaDescription":"Schneider Electric C4044B400 ComPacT NSX400...630 trip unit, MicroLogic 4.3 AB, 400 A at 40 °C, EN/IEC 60947-2. Integrated earth-leakage protection. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Range":"ComPacT","Standards":"EN/IEC 60947-2","Network type":"AC","Thermal memory":"20 minutes before and after tripping","Trip unit name":"MicroLogic 4.3 AB","Protection type":"L : for overload protection (long time) So : for short time short-circuit protection with fixed delay I : for instantaneous short-circuit protection R : for earth-leakage 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","Neutral position":"Left","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":"4P","Device application":"Special application","Trip unit technology":"Electronic","IP degree of protection":"IP40 conforming to IEC 60529","Earth-leakage protection":"Integrated","Product or component type":"Trip unit","Neutral protection settings":"0.5 x Ir (3D + N/2) 1 x Ir (4D) No protection (3D)","Protected poles description":"3D + N/2 4D 3D","Circuit breaker mounting mode":"Fixed","Earth-leakage protection class":"Class A","Trip unit protection functions":"LSoIR","[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":"0.35 s at 7.2 x Ir 0.5 s at 6 x Ir 15 s at 1.5 x Ir","Short-time protection pick-up adjustment type Isd":"Adjustable","[Ir] long-time protection pick-up adjustment range":"260...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","[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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3a886b822700cc352e4b12d8337b367d.pdf","sourceUrl":"https://www.se.com/nl/en/product/C4044B400/trip-unit-micrologic-vigi-4-3ab-compact-nsx400-630-4p-basic-and-earth-leakage-protections-special-application-400a/","alternativesUrl":"https://aoctrl.com/api/mcp/products/C4044B400/alternatives.json"},"ai":{"faq":[{"question":"What is C4044B400's listed range and standards?","answer":"It belongs to the ComPacT NSX400...630 range and complies with EN/IEC 60947-2."},{"question":"What protection functions does the MicroLogic 4.3 AB trip unit provide?","answer":"It provides L (long-time overload), So (short-time short-circuit with fixed delay), I (instantaneous short-circuit), and R (earth-leakage) protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C4044B400","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/C4044B400 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}