{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LX4FH055","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LX4FH055","canonicalUrl":"https://aoctrl.com/schneider/LX4FH055","factsUrl":"https://aoctrl.com/api/mcp/products/LX4FH055","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys LX4FH055 contactor coil, 55 V DC, DC wide range, 40-50 ms closing, 40-65 ms opening, without built-in suppressor module.","salesMarkdown":"The LX4FH055 is a replacement contactor coil from the TeSys range, designed for 55 V DC control circuits. It's the part that pulls the contactor in and holds it closed — without it, the main power contacts don't move. Rated for DC wide-range control, the coil operates between 0.85 and 1.1 times Uc (about 47 to 60.5 V DC) at 55 °C, and drops out between 0.15 and 0.2 Uc (roughly 8.25 to 11 V DC). That dropout margin means the contactor releases reliably on a sagging DC bus — important for undervoltage protection schemes. Closing time is 40 to 50 ms; opening takes 40 to 65 ms. Those are the mechanical travel times — the arc extinction on the main poles adds its own window, but this is the coil's contribution to the overall switching sequence. ## Coil resistance and suppressor note At 68 °F (20 °C), the inrush resistance is 4.37 Ω and the holding resistance is 994.1 Ω. The big jump between inrush and holding is normal for a DC coil — the initial surge pulls the armature in, then the holding current drops to a fraction of that. If you're sizing a DC supply, the inrush current (about 12.6 A at 55 V) is the peak load, not the steady-state draw. This coil ships without a built-in suppressor module. On a DC circuit, that means you need an external flyback diode or a varistor across the coil terminals — otherwise the inductive kick when the coil de-energises can damage the PLC output or relay driving it. Standard practice: a 1N4007 diode (or equivalent) cathode to positive, anode to negative, placed as close to the coil as wiring allows. The LX4FH055 is a service-part coil for TeSys contactors that accept the FH-series coil assembly. It's not a standalone component — it mounts onto the contactor's magnet system, replacing the original coil if it fails or if the control voltage needs changing.","metaTitle":"TeSys LX4FH055 contactor coil, 55 V DC, active","metaDescription":"TeSys LX4FH055 contactor coil, 55 V DC, DC wide range, 40-50 ms closing, 40-65 ms opening. Active lifecycle, sourced to order. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactor & Starter Coils"],"specifications":{"Range":"TeSys","title":"LX4FH055","Category":"18401-WORLD SERVICE PARTS(CTR ACCESS)","description":"contactor coil - FH - 55 V DC","Operating time":"40...50 ms closing 40...65 ms opening","Coil technology":"Without built-in suppressor module","lifecycle_stage":"current","Device short name":"LX4FH","Average resistance":"4.37 Ohm inrush 68 °F (20 °C) 994.1 Ohm holding 68 °F (20 °C)","Control circuit type":"DC wide range","Nbr. of units in pkg.":"1","Product or Component Type":"Contactor coil","[Uc] control circuit voltage":"55 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/18c209c1937a8ae54e14f87b0a27973c.pdf","sourceUrl":"https://www.se.com/th/en/product/LX4FH055/contactor-coil-fh-55-v-dc/"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LX4FH055 in this component family?","answer":"Within the TeSys FH coil family, the primary selection parameter is the control voltage. The LX4FH range covers several DC voltages; the LX4FH055 is the 55 V DC variant. A different voltage coil (e.g., 24 V DC or 110 V DC) would require a different order code and is not pin-compatible without also changing the control circuit supply."},{"question":"What is LX4FH055's listed range (TeSys) on this component line?","answer":"It belongs to the TeSys range, Schneider Electric's family of contactors, overload relays, and control accessories for motor starting and power switching."},{"question":"What is LX4FH055's listed category (18401-WORLD SERVICE PARTS(CTR ACCESS)) on this component line?","answer":"The category is 18401-WORLD SERVICE PARTS(CTR ACCESS), which indicates it is a service / replacement part for control accessories, stocked globally for aftermarket support."},{"question":"What compliance documentation does this brand provide for LX4FH055 (RoHS, REACH, UL, IEC)?","answer":"As a TeSys component from Schneider Electric, the LX4FH055 is typically covered by the brand's standard declarations of conformity (CE, UKCA) and RoHS / REACH compliance documentation. Specific certificates (UL, IEC) are available on request through the RFQ process — the evidence does not list them individually for this order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LX4FH055","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/LX4FH055 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}}