{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C2544A250","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C2544A250","canonicalUrl":"https://aoctrl.com/schneider/C2544A250","factsUrl":"https://aoctrl.com/api/mcp/products/C2544A250","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NSX250, MicroLogic 4.2 AL electronic trip unit, 250 A, 4 poles, integrated earth-leakage protection, EN/IEC 60947-2.","salesMarkdown":"## What this trip unit does The C2544A250 is a Schneider Electric ComPacT NSX250 electronic trip unit — the MicroLogic 4.2 AL variant rated 250 A at 40 °C. It fits fixed-mount ComPacT NSX100...250 frames and provides LSoI protection (long-time, short-time with fixed delay, instantaneous) plus integrated earth-leakage protection (Class A). The long-time pickup (Ir) is adjustable from 100 to 250 A; short-time pickup (Isd) adjusts from 1.5 to 10 x Ir; instantaneous pickup is fixed at 3000 A. That means you set the overload threshold to match your cable or load, then dial the short-time pickup to coordinate with downstream breakers — selectivity without a separate relay. The 4-pole design with neutral on the left handles 3D + N/2, 4D, or 3D protection schemes — you pick the neutral protection setting (0.5 x Ir, 1 x Ir, or none) via the trip unit. ## Protection logic and signalling Local signalling includes a green flashing LED for ready state, red LED at 105 % Ir for overload, orange LED at 90 % Ir for pre-alarm, and a yellow indicator for residual current. Earth-leakage sensitivity (IΔn) and time delay (Δt) are both adjustable; the protection can be switched off via the IΔn rotary switch. No zone selective interlocking (ZSI) on this variant.","metaTitle":"C2544A250 ComPacT NSX250 MicroLogic 4.2 AL trip unit, 250 A","metaDescription":"C2544A250 is a Schneider Electric ComPacT NSX250 trip unit, 250 A, 4P, MicroLogic 4.2 AL with integrated earth-leakage protection. 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":"C2544A250","Standards":"EN/IEC 60947-2","description":"Trip unit MicroLogic Vigi 4.2AL, ComPacT NSX250, 4 poles, electronic basic protections, earth leakage alarm, 250A","Network type":"AC","Thermal memory":"20 minutes before and after tripping","Trip unit name":"MicroLogic 4.2 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","Neutral position":"Left","Pollution degree":"3 conforming to IEC 60947-1","Range of product":"ComPacT NSX100...250","Trip unit rating":"250 A at 40 °C","Network frequency":"50/60 Hz","Poles description":"4P","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","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":"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":"-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":"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":"100...250 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":"3000 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":"0.03 A 0.1 A 0.3 A 0.5 A 1 A 3 A 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/03a0b7db2cfeeb0c3932fb7f35a2099f.pdf","sourceUrl":"https://www.se.com/au/en/product/C2544A250/trip-unit-micrologic-vigi-4-2al-compact-nsx250-4-poles-electronic-basic-protections-earth-leakage-alarm-250a/"},"ai":{"faq":[{"question":"What standards does C2544A250 comply with?","answer":"It complies with EN/IEC 60947-2, the standard for low-voltage switchgear and controlgear."},{"question":"What is the closest alternative to C2544A250 in the same family?","answer":"Within the ComPacT NSX250 range, the closest sibling is the MicroLogic 4.2 (without the AL suffix), which omits the integrated earth-leakage protection. If you need ground-fault detection, the C2544A250 is the right pick; if you do not, the standard 4.2 saves cost."},{"question":"Where can I buy C2544A250 and how is it quoted?","answer":"The C2544A250 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C2544A250","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/C2544A250 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}}