{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LX4FK400","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LX4FK400","canonicalUrl":"https://aoctrl.com/schneider/LX4FK400","factsUrl":"https://aoctrl.com/api/mcp/products/LX4FK400","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys F, contactor coil LX4FK400, 400 V DC control circuit, 45-60 ms opening time, 10 Mcycles mechanical durability.","salesMarkdown":"The LX4FK400: Coil technology is 'without built-in suppressor module' — no internal flyback diode or RC snubber. Add an external free-wheeling diode across the coil terminals to protect the DC control circuit from the inductive kick when the contactor drops out. Control circuit voltage is 400 V DC, with operational limits of 0.85 to 1.1 Uc at 131 °F (55 °C). Dropout voltage sits at 0.2 to 0.35 Uc — the coil releases the armature when the control voltage falls below that range. Opening time is 45 to 60 ms; closing time is 50 to 60 ms. The maximum operating rate is 2400 cycles per hour at 131 °F (55 °C). Inrush power hits 1100 W at 68 °F (20 °C), then drops to 6 W holding. Average inrush resistance is 225 ohms; holding resistance jumps to 31,300 ohms. That large ratio is typical of DC economizer circuits — the coil pulls hard to close the contactor, then shifts to a low-power hold. The inductance of the closed circuit is 5270 H, which is high; the external free-wheeling diode must handle the stored energy when the coil de-energizes. Electrical life will be lower depending on the switched current and duty cycle.","metaTitle":"TeSys LX4FK400 contactor coil, 400 V DC, active","metaDescription":"TeSys F contactor coil LX4FK400, 400 V DC control voltage, 45-60 ms opening time, 10 Mcycles mechanical durability, active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactor & Starter Coils"],"specifications":{"Range":"TeSys","Category":"18401-WORLD SERVICE PARTS(CTR ACCESS)","Operating time":"45...60 ms opening 50...60 ms closing","Coil technology":"Without built-in suppressor module","lifecycle_stage":"current","Device short name":"LX4FK","Inrush power in W":"1100 W 68 °F (20 °C))","Average resistance":"225 Ohm inrush 68 °F (20 °C) 31300 Ohm holding 68 °F (20 °C)","Control circuit type":"DC low consumption","Mechanical durability":"10 Mcycles","Nbr. of units in pkg.":"1","Maximum operating rate":"2400 cyc/h 131 °F (55 °C)","Product or Component Type":"Contactor coil","Inductance of closed circuit":"5270 H","[Uc] control circuit voltage":"400 V DC","Control circuit voltage limits":"Drop-out 0.2...0.35 Uc 131 °F (55 °C)) Operational 0.85...1.1 Uc 131 °F (55 °C))","Hold-in power consumption in W":"6 W 68 °F (20 °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/0a877ac9d9b1603dd92529e68704309a.pdf","sourceUrl":"https://www.se.com/th/en/product/LX4FK400/tesys-f-contactor-coil-lx4fk-400-v-dc/","alternativesUrl":"https://aoctrl.com/api/mcp/products/LX4FK400/alternatives.json"},"ai":{"faq":[{"question":"What range and category does the LX4FK400 belong to?","answer":"It is part of the TeSys range, specifically category '18401-WORLD SERVICE PARTS (CTR ACCESS)' — which covers service parts and control accessories for the TeSys contactor family. The device short name is LX4FK."},{"question":"Does the LX4FK400 include a built-in suppression diode?","answer":"No. The coil technology is listed as 'without built-in suppressor module.' You must install an external free-wheeling diode (e.g., 1N4007) across the coil terminals to suppress the inductive voltage spike when the coil de-energizes."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LX4FK400","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/LX4FK400 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}}