{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LX4FF350","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LX4FF350","canonicalUrl":"https://aoctrl.com/schneider/LX4FF350","factsUrl":"https://aoctrl.com/api/mcp/products/LX4FF350","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys LX4FF350 contactor coil, 350 V DC, DC low consumption, 30-40 ms closing, 30-50 ms opening.","salesMarkdown":"The LX4FF350 is a replacement contactor coil from the Schneider Electric TeSys range, designed for DC control circuits at 350 V DC. It's a DC low-consumption coil with no built-in suppressor module, so you'll need to add external flyback suppression if the circuit demands it. Closing time runs 30 to 40 ms; opening takes 30 to 50 ms. The coil holds at 350 V DC nominal, with an operational range of 0.85 to 1.1 Uc (298 to 385 V DC) at 55 °C, and drops out between 0.15 and 0.2 Uc (52.5 to 70 V DC). Ambient operating temperature is -5 to 55 °C. No official successor order code appears in the lifecycle record. If you're filling a service spare or a line-down replacement, the safest route is to source a sealed surplus unit against an RFQ. Condition is everything here — verify the coil hasn't been sitting in a damp warehouse for a decade. The 350 V DC control voltage is specific — this isn't a 24 V or 110 V coil. If your panel runs a 350 V DC control bus, this coil drops right in. If not, you'll need a different coil from the TeSys FF family or an external DC-DC converter. The 30-40 ms closing time is typical for a contactor of this size; it's not a fast-switching application like a DC drive precharge. The coil's average holding resistance is 34,910 ohms at 20 °C, with an inrush resistance of 199.7 ohms. That inrush-to-hold ratio is normal for a DC coil — the initial current spike is about 175 times the holding current, so make sure your control transformer or DC supply can handle the surge without dropping out.","metaTitle":"TeSys LX4FF350 Contactor Coil, 350 V DC, Obsolete","metaDescription":"TeSys LX4FF350 contactor coil, 350 V DC, 30-40 ms closing. Obsolete — sourced to order against an RFQ. Find the replacement or surplus unit here.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Contactor & Starter Coils"],"specifications":{"Range":"TeSys","Category":"18401-WORLD SERVICE PARTS(CTR ACCESS)","Operating time":"30...40 ms closing 30...50 ms opening","Coil technology":"Without built-in suppressor module","lifecycle_stage":"current","Device short name":"LX4FF","Average resistance":"34910 Ohm holding 68 °F (20 °C) 199.7 Ohm inrush 68 °F (20 °C)","Control circuit type":"DC low consumption","Nbr. of units in pkg.":"1","Product or Component Type":"Contactor coil","[Uc] control circuit voltage":"350 V DC","Control circuit voltage limits":"Operational 0.85...1.1 Uc 131 °F (55 °C)) Drop-out 0.15...0.2 Uc 131 °F (55 °C))","Ambient Air Temperature for Operation":"23...131 °F (-5...55 °C)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/51ae7d7342e7b6b309b9cc19846bcd37.pdf","sourceUrl":"https://www.se.com/us/en/product/LX4FF350/contactor-coil-ff-350-v-dc/","alternativesUrl":"https://aoctrl.com/api/mcp/products/LX4FF350/alternatives.json"},"ai":{"faq":[{"question":"What is the closest alternative to LX4FF350?","answer":"No official successor order code is listed in the lifecycle record. For a pin-compatible replacement, you would need to check the TeSys FF coil family for a 350 V DC coil with the same mounting footprint. Without a direct cross-reference from Schneider, the safest bet is to source a sealed surplus LX4FF350."},{"question":"What is the control voltage and operating range?","answer":"The coil is rated for 350 V DC nominal. It operates between 0.85 and 1.1 Uc (298 to 385 V DC) at 55 °C and drops out between 0.15 and 0.2 Uc (52.5 to 70 V DC)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LX4FF350","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/LX4FF350 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}