{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LX4FG040","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LX4FG040","canonicalUrl":"https://aoctrl.com/schneider/LX4FG040","factsUrl":"https://aoctrl.com/api/mcp/products/LX4FG040","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys F contactor coil, LX4FG040, 48 V DC wide range, obsolete.","salesMarkdown":"The LX4FG040 is a replacement contactor coil from the Schneider Electric TeSys F range, designed for 48 V DC wide-range control circuits. It is the coil that drives the main contactor in a TeSys F motor starter or contactor assembly — when the coil pulls in, the power contacts close; when it drops out, they open. The coil draws 800 W inrush at 20 °C and settles to 5 W holding power. The average resistance is 2 Ω inrush and 359 Ω holding at 20 °C, with a closed-circuit inductance of 34.4 H. The control circuit is DC wide range, meaning it accepts a broader voltage band than a standard DC coil — the operational limits are 0.7 to 1.25 Uc at 70 °C, and drop-out occurs between 0.2 and 0.45 Uc at 70 °C. This gives the coil some tolerance for voltage sag in the control circuit. There is no built-in suppressor module on this coil. That means the installer must add an external flyback diode or RC snubber across the coil terminals to protect the control circuit from the inductive kick when the coil de-energizes. The ambient temperature range for operation is -55 to 70 °C. The 48 V DC control voltage is the nominal rating — the coil is designed to operate reliably at 48 V DC, but the wide-range design means it will pull in at voltages as low as 33.6 V DC (0.7 × 48 V) and hold in up to 60 V DC (1.25 × 48 V) at 70 °C. The drop-out range of 0.2 to 0.45 Uc (9.6 to 21.6 V DC) means the coil will release the contactor when the control voltage falls below that band, which is a safety feature for undervoltage protection. The 800 W inrush figure tells you the coil draws a heavy surge on energization — the control transformer or DC power supply must be sized to handle that transient without drooping below the pick-up threshold. The 1 Mcycles mechanical durability is the expected life of the coil mechanism under no-load switching. In a real application with a contactor switching motor loads, the electrical life of the main contacts will typically be shorter than the coil's mechanical life. The 60 cycles per hour maximum rate at 70 °C is a thermal limit — exceeding that rate can overheat the coil and reduce its service life.","metaTitle":"TeSys LX4FG040 Contactor Coil, 48 V DC, Obsolete","metaDescription":"Obsolete TeSys F contactor coil LX4FG040, 48 V DC wide range, 800 W inrush, 5 W holding. Sourced to order against RFQ. No direct replacement listed.","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":"LX4FG","Inrush power in W":"800 W 68 °F (20 °C))","Average resistance":"2 Ohm inrush 68 °F (20 °C) 359 Ohm holding 68 °F (20 °C)","Control circuit type":"DC wide range","Mechanical durability":"1 Mcycles","Nbr. of units in pkg.":"1","Maximum operating rate":"60 cyc/h 158 °F (70 °C)","Product or Component Type":"Contactor coil","Inductance of closed circuit":"34.4 H","[Uc] control circuit voltage":"48 V DC","Control circuit voltage limits":"Operational 0.7...1.25 Uc 158 °F (70 °C)) Drop-out 0.2...0.45 Uc 158 °F (70 °C))","Hold-in power consumption in W":"5 W 68 °F (20 °C)","Ambient Air Temperature for Operation":"-67...158 °F (-55...70 °C)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6f9b3ce11ebee1a884920afa6fd67854.pdf","sourceUrl":"https://www.se.com/us/en/product/LX4FG040/tesys-f-contactor-coil-lx4fg-48-v-dc-wide-range/","alternativesUrl":"https://aoctrl.com/api/mcp/products/LX4FG040/alternatives.json"},"ai":{"faq":[{"question":"What is the control voltage for this coil?","answer":"The control circuit voltage is 48 V DC, with a wide-range design. The operational limits are 0.7 to 1.25 Uc (33.6 to 60 V DC) at 70 °C, and drop-out occurs between 0.2 and 0.45 Uc (9.6 to 21.6 V DC) at 70 °C."},{"question":"Does this coil have a built-in suppressor?","answer":"No, the coil technology is listed as without built-in suppressor module. An external flyback diode or RC snubber must be added across the coil terminals to suppress the inductive voltage spike when the coil de-energizes."},{"question":"What is the operating temperature range?","answer":"The ambient air temperature for operation is -67 to 158 °F (-55 to 70 °C)."},{"question":"How do I source this obsolete part?","answer":"Since the LX4FG040 is obsolete, it is sourced through independent surplus and broker channels. We can quote it to order against an RFQ. The buyer should verify the coil's condition and date code before committing the BOM line."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LX4FG040","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/LX4FG040 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}}