{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LV839266","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LV839266","canonicalUrl":"https://aoctrl.com/schneider/LV839266","factsUrl":"https://aoctrl.com/api/mcp/products/LV839266","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric LV839266, MN diagnostic undervoltage release, 48 V AC 50/60 Hz, 48-60 V DC, drawout mounting for MasterPact MTZ1/MTZ2/MTZ3 breakers.","salesMarkdown":"The Schneider Electric LV839266 is an MN diagnostic undervoltage release for MasterPact MTZ drawout breakers. It trips the breaker when the control voltage drops below 0.35 to 0.7 Un, and allows closing only above 0.85 Un — standard undervoltage protection that prevents automatic reclosure after a supply dip. The communicating control type means it reports its status (MN open, coil powered) back to the breaker's communication network, so a PLC or BMS knows exactly why the breaker tripped without a panel walk-down. Drawout mounting means this release plugs into the MasterPact MTZ cradle — no wiring to the breaker itself. The control circuit accepts 48 V AC at 50/60 Hz or 48 to 60 V DC, drawing 4.5 W / 4.5 VA holding power. Response time is 40 ms ±5% on MTZ1, 90 ms ±5% on MTZ2 and MTZ3.","metaTitle":"Schneider LV839266 MN Diagnostic Undervoltage Release, 48 V","metaDescription":"Schneider Electric LV839266 MN diagnostic undervoltage release for MasterPact MTZ drawout breakers. 48 V AC 50/60 Hz, 48-60 V DC control circuit. Active production, sourced to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Air Circuit Breakers"],"specifications":{"title":"LV839266","description":"MN diagnostic undervoltage release - 48 V AC - 48/60 V DC - for MTZ drawout","Control Type":"Communicating","Mounting Mode":"Drawout","Response time":"40 ms +/- 5 % MasterPact MTZ1 90 ms +/- 5 % MasterPact MTZ2 90 ms +/- 5 % MasterPact MTZ3","lifecycle_stage":"current","Device short name":"MN diag","Device Application":"Safety","Signalling function":"Error MN open Coil powered","Supply holding power":"4.5 W 4.5 VA","Voltage release type":"Undervoltage release","Nbr. of units in pkg.":"1","Product or Component Type":"Voltage release","Threshold tripping voltage":"0.35...0.7 Un on opening 0.85 Un on closing","[Uc] control circuit voltage":"48 V AC 50/60 Hz 48...60 V DC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b4e7352e3d112edd9a1f78f54b910d94.pdf","sourceUrl":"https://www.se.com/us/en/product/LV839266/mn-diagnostic-undervoltage-release-48-v-ac-48-60-v-dc-for-mtz-drawout/"},"ai":{"faq":[{"question":"What does the MN diagnostic function report?","answer":"The MN diagnostic function signals 'Error MN open' and 'Coil powered' status back through the breaker's communication network, so the control system knows the undervoltage release state without a physical inspection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LV839266","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/LV839266 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}