{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LX4FJ045","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LX4FJ045","canonicalUrl":"https://aoctrl.com/schneider/LX4FJ045","factsUrl":"https://aoctrl.com/api/mcp/products/LX4FJ045","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys LX4FJ045 contactor coil, 45 V DC, for FJ frame contactors, active production.","salesMarkdown":"The LX4FJ045 is a replacement contactor coil from the TeSys range, built for FJ frame contactors. It's the part you swap when the coil opens up or the control voltage goes missing — no need to replace the whole contactor if the main poles and arc chambers are still good. This coil runs on 45 V DC, low-consumption type, so it's meant for DC control circuits — not a 24 V or 48 V nominal bus. The drop-out threshold sits between 20% and 35% of Uc at 55 °C, meaning it'll drop the contactor cleanly if the control voltage sags below about 9 to 16 V DC. Operational range is 85% to 110% of Uc at the same temperature, so you've got some headroom on a 48 V supply, but don't push it past 49.5 V. ## Timing and coil characteristics — what matters on site Opening time runs 45 to 60 ms, closing time 50 to 60 ms. That's tight enough for most motor control and interlocking circuits — you're not going to lose a race condition with a PLC scan cycle unless the logic is milliseconds-critical. The coil draws about 1.98 ohms inrush at 20 °C, then settles to 526.1 ohms holding — standard DC economizer behavior, so your power supply sees a big thump on pickup, then a low hold current. No built-in suppressor module on this coil, so you'll want a free-wheeling diode or RC snubber across the coil if you're switching it with a PLC output or solid-state relay; the inductive kickback will fry a transistor output without one. Rated for ambient operation from -5 °C to 55 °C — fine for most indoor panels and mild outdoor enclosures. If the panel sits in a hot machine bay or direct sun, check the derating: the holding resistance climbs with temperature, so at 55 °C the coil might not pull in reliably if the supply voltage is at the low end of the operational range.","metaTitle":"TeSys LX4FJ045 Contactor Coil, 45 V DC, Active","metaDescription":"TeSys LX4FJ045 replacement contactor coil for FJ contactors. 45 V DC control, 45-60 ms opening time. 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","title":"LX4FJ045","Category":"18401-WORLD SERVICE PARTS(CTR ACCESS)","description":"contactor coil - FJ - 45 V DC","Operating time":"45...60 ms opening 50...60 ms closing","Coil technology":"Without built-in suppressor module","lifecycle_stage":"current","Device short name":"LX4FJ","Average resistance":"1.98 Ohm inrush 68 °F (20 °C) 526.1 Ohm holding 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":"45 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))","Ambient Air Temperature for Operation":"23...131 °F (-5...55 °C)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6d4f0ad7480ffa75f516373a97c37796.pdf","sourceUrl":"https://www.se.com/uk/en/product/LX4FJ045/contactor-coil-fj-45-v-dc/"},"ai":{"faq":[{"question":"What contactor does this coil fit?","answer":"This coil is designed for FJ frame contactors in the TeSys range. The device short name is LX4FJ, so it fits any TeSys contactor using that coil platform."},{"question":"What is the control voltage and what are the drop-out limits?","answer":"The control circuit voltage is 45 V DC. Drop-out occurs between 20% and 35% of Uc at 55 °C (roughly 9 to 16 V DC). The operational range is 85% to 110% of Uc at the same temperature."},{"question":"Does this coil have a built-in suppressor?","answer":"No, the LX4FJ045 is specified without a built-in suppressor module. You need to add an external free-wheeling diode or RC snubber across the coil when switching with electronics."},{"question":"What are the opening and closing times?","answer":"Opening time is 45 to 60 ms; closing time is 50 to 60 ms. These are typical for DC-operated contactor coils in this frame size."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LX4FJ045","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/LX4FJ045 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}}