{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LA9FK4F4F","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LA9FK4F4F","canonicalUrl":"https://aoctrl.com/schneider/LA9FK4F4F","factsUrl":"https://aoctrl.com/api/mcp/products/LA9FK4F4F","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys F, LA9FK4F4F, mechanical interlock for 3 vertical contactors, LC1F115-LC1F150 and CR1F150.","salesMarkdown":"The Schneider Electric TeSys LA9FK4F4F is a mechanical interlock accessory designed to prevent simultaneous closure of two contactors in a reversing or bypass configuration. It physically blocks the armature of one contactor from closing when the other is engaged, which is the standard method for ensuring a break-before-make sequence in motor-reversing and star-delta starters. The interlocking type is purely mechanical — no electrical connections, no auxiliary contacts to wire. It is a passive safety device that sits between the contactor yokes. ## Which Contactors It Fits The LA9FK4F4F interlocks bottom-position LC1F115 through LC1F150 (3P or 4P) or CR1F150 (3P or 4P), middle-position LC1F115 through LC1F150 (3P or 4P) or CR1F150 (3P or 4P), and top-position LC1F500 (2P, 3P, or 4P) or CR1F500 (3P or 4P). This covers the F-frame contactor range from 115 A up to 500 A, including both power and control-circuit (CR1F) variants. Mounting position is specified as three vertical — the contactors sit one above the other on the panel. This is the standard layout for a two-speed or reversing starter where the contactors share a common bus. The interlock bar engages the contactor yokes through the front face; no rear-panel access is needed for installation. The active status means no forced alternate search — the same order code lands the same mechanical interlock as the original design.","metaTitle":"Schneider TeSys LA9FK4F4F Mechanical Interlock, 3 Vertical C","metaDescription":"Schneider TeSys LA9FK4F4F mechanical interlock for 3 vertical contactors. Active production. For LC1F115...LC1F150 and CR1F150 contactors. RFQ for firm lead time.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Control Accessories"],"specifications":{"Range":"TeSys","title":"LA9FK4F4F","Category":"18402-WORLD SERVICE PARTS(CONTROL ACCESS)","description":"TeSys F- mechanical interlock - for 3 vertical contactors","lifecycle_stage":"current","Device short name":"LA9F","Interlocking type":"Mechanical","Mounting position":"3 vertical","Interlocked device":"Bottom LC1F115...LC1F150 3P or 4P Bottom CR1F150 3P or 4P Middle LC1F115...LC1F150 3P or 4P Middle CR1F150 3P or 4P Top LC1F500 2P or 3P or 4P Top CR1F500 3P or 4P","Nbr. of units in pkg.":"1","Product or Component Type":"Mechanical interlock","Accessory / separate part category":"Interlocking accessory"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/93d4d097eae6fe0a4d6730f46743ff1e.pdf","sourceUrl":"https://www.se.com/us/en/product/LA9FK4F4F/tesys-f-mechanical-interlock-for-3-vertical-contactors/"},"ai":{"faq":[{"question":"What contactors does the LA9FK4F4F mechanically interlock?","answer":"It interlocks bottom and middle LC1F115 through LC1F150 or CR1F150 (3P or 4P), and top LC1F500 or CR1F500 (3P or 4P). The arrangement is three vertical contactors."},{"question":"What is the product range of the LA9FK4F4F?","answer":"It belongs to the Schneider Electric TeSys range, specifically the TeSys F series of contactors and accessories."},{"question":"What is the interlocking type of the LA9FK4F4F?","answer":"It is a mechanical interlock. It physically blocks the armature of one contactor when the other is closed, with no electrical connections required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LA9FK4F4F","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/LA9FK4F4F 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}}