{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LE3400U43X","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LE3400U43X","canonicalUrl":"https://aoctrl.com/schneider/LE3400U43X","factsUrl":"https://aoctrl.com/api/mcp/products/LE3400U43X","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric PowerPacT L, Micrologic ammeter trip unit, LSI, 5.3A, 125A to 400A, order code LE3400U43X.","salesMarkdown":"## Trip unit identity and fit The LE3400U43X is a Micrologic electronic trip unit for Schneider Electric PowerPacT L molded-case circuit breakers. It carries the LSI protection curve — long-time, short-time, and instantaneous — plus an integral ammeter for local current readout. The adjustable rating range spans 125A to 400A, with a fixed 5.3A sensor rating that sets the base scaling. The 5.3A sensor rating is the current transformer tap — it defines the minimum pickup floor for the protection algorithms. The 125A to 400A adjustable range means the same trip unit covers a wide spread of frame sizes; you set the actual continuous-current rating via the dial on the front face. LSI protection gives you separate time-current adjustment for overload (long-time), short-delay (short-time), and instantaneous fault trip — useful for selective coordination in a distribution panel where you need the downstream breaker to clear first. ## Deployment context Mounts into the PowerPacT L breaker frame as a plug-in module. The breaker itself bolts into a panelboard or switchboard enclosure — typical install for commercial and light industrial distribution, 480VAC or 600VAC feeder circuits. The ammeter display is front-facing for at-a-glance load monitoring without opening the door.","metaTitle":"Schneider Electric LE3400U43X PowerPacT L Trip Unit, Microlo","metaDescription":"Schneider Electric LE3400U43X trip unit for PowerPacT L breakers. Micrologic ammeter, LSI protection, 5.3A rating, adjustable 125A to 400A range. Active production, sourced to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Air Circuit Breakers"],"specifications":{"title":"LE3400U43X","Category":"US10DE201078","description":"Trip unit, PowerPacT L, Micrologic ammeter, LSI, 5.3A, 125A to 400A","lifecycle_stage":"current","Nbr. of units in pkg.":"1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d984a0ced5c1fbc2a23c8f37f16ffd10.pdf","sourceUrl":"https://www.se.com/us/en/product/LE3400U43X/trip-unit-powerpact-l-micrologic-ammeter-lsi-5-3a-125a-to-400a/"},"ai":{"faq":[{"question":"Where can I buy LE3400U43X and how do I get a price?","answer":"The LE3400U43X is sourced to order against an RFQ through independent distribution. Submit a quote request for current pricing and availability confirmation."},{"question":"What is LE3400U43X's listed category on this component line?","answer":"The category code is US10DE201078, which maps to Schneider Electric PowerPacT L trip units and accessories in the industrial automation catalog."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LE3400U43X","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/LE3400U43X 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}}