{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LA9FL4L4K","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LA9FL4L4K","canonicalUrl":"https://aoctrl.com/schneider/LA9FL4L4K","factsUrl":"https://aoctrl.com/api/mcp/products/LA9FL4L4K","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys F, LA9FL4L4K, mechanical interlock for 3 vertical contactors, interlocks LC1F500/630/800 and CR1F500/630.","salesMarkdown":"The LA9FL4L4K is a TeSys F mechanical interlock — a panel accessory that physically prevents two or three contactors from closing simultaneously. It mounts in a 3-vertical configuration, meaning the three contactors stack one above the other on the DIN rail or backplate, and the interlock bar ties their armatures together so only one can pull in at a time. The interlock is compatible with a specific set of TeSys F contactors and reversing contactors: bottom position accepts LC1F500 2P/3P/4P or CR1F500 3P/4P; top position accepts LC1F630 3P/4P, LC1F800 3P, or CR1F630 3P/4P; middle position accepts LC1F630 3P/4P, LC1F800 3P, or CR1F630 3P/4P. That covers the 500 A to 800 A frame sizes in the TeSys F line. ## What the mechanical interlock does for the circuit A mechanical interlock is the simplest way to enforce electrical isolation between two power paths — no logic, no PLC code, no auxiliary contact wiring. When you have a reversing starter or a changeover scheme (mains-to-generator, pump A-to-pump B), this bar guarantees that even if both coils get energized by a control fault, the power contacts cannot physically close together. That prevents phase-to-phase shorts that would blow fuses or weld contactor tips. ## Mounting and integration note Mounts in a 3-vertical stack. The interlock bar spans the three contactor armatures; you clip it onto the front of the contactors after they are snapped onto the DIN rail. No extra wiring — it is a purely mechanical part. The device short name LA9F is consistent across the TeSys F accessory family, so if you already have LA9F interlocks in the panel, the LA9FL4L4K uses the same bar profile.","metaTitle":"Schneider LA9FL4L4K TeSys F Mechanical Interlock for 3 Conta","metaDescription":"Active-production TeSys F mechanical interlock for 3 vertical contactors. Interlocks LC1F500, LC1F630, LC1F800, CR1F500, CR1F630. Source to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Control Accessories"],"specifications":{"Range":"TeSys","title":"LA9FL4L4K","Category":"18401-WORLD SERVICE PARTS(CTR 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 LC1F500 2P or 3P or 4P Bottom CR1F500 3P or 4P Top LC1F630 3P or 4P Top LC1F800 3P Top CR1F630 3P or 4P Middle LC1F630 3P or 4P Middle LC1F800 3P Middle CR1F630 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/79eac4242fcf54f6ed570bfb57159e0c.pdf","sourceUrl":"https://www.se.com/us/en/product/LA9FL4L4K/tesys-f-mechanical-interlock-for-3-vertical-contactors/"},"ai":{"faq":[{"question":"What contactors does this interlock work with?","answer":"It interlocks three vertical contactors in the TeSys F frame. Bottom position: LC1F500 2P/3P/4P or CR1F500 3P/4P. Top position: LC1F630 3P/4P, LC1F800 3P, or CR1F630 3P/4P. Middle position: LC1F630 3P/4P, LC1F800 3P, or CR1F630 3P/4P."},{"question":"Is this a direct replacement for an existing LA9F interlock in a 3-vertical stack?","answer":"If the existing interlock is a TeSys F LA9F type for three vertical contactors, the LA9FL4L4K uses the same bar profile and mounting. Check that your contactor frame sizes match the compatibility list — it covers 500 A, 630 A, and 800 A frames in the TeSys F line."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LA9FL4L4K","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/LA9FL4L4K 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}}