{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LR3D3557","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LR3D3557","canonicalUrl":"https://aoctrl.com/schneider/LR3D3557","factsUrl":"https://aoctrl.com/api/mcp/products/LR3D3557","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys Deca LR3D3557, non-differential thermal overload relay, 37-50 A adjustment range, Class 20, for motor protection.","salesMarkdown":"The LR3D3557: Mounts directly under a TeSys contactor, or on a plate or rail with specific accessories. Screw-clamp terminals throughout; tightening torque is 9 N·m on the power side and 1.7 N·m on the control side. IP20 degree of protection allows use inside standard enclosures; flame retardance V1 per UL 94. Certified to IEC 60947-4-1, IEC 60947-5-1, UL 60947-4-1, UL 60947-5-1, CSA C22.2 No 60947-4-1 and 60947-5-1, plus GB/T equivalents. Rated insulation voltage 1000 V IEC, 600 V UL/CSA.","metaTitle":"Schneider LR3D3557 TeSys Overload Relay, 37-50A, Class 20","metaDescription":"LR3D3557 is active production. Non-differential thermal overload relay, 37-50 A, Class 20, IP20. For TeSys contactors. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":[],"specifications":{"Depth":"4.8 in (121 mm)","Range":"TeSys","Width":"3.0 in (75 mm)","Category":"US10I1222347","Standards":"EN/IEC 60947-4-1 EN/IEC 60947-5-1 UL 60947-4-1 UL 60947-5-1 CSA C22.2 No 60947-4-1 CSA C22.2 No 60947-5-1 GB/T 14048.4 GB/T 14048.5","Control type":"Red push-button stop Blue push-button reset","Network type":"AC DC","Product name":"TeSys LRD TeSys Deca","lifecycle_stage":"current","Flame retardance":"V1 conforming to UL 94","Mounting support":"Plate, with specific accessories Rail, with specific accessories Under contactor","Device short name":"LR3D","Network Frequency":"0...400 Hz","Relay application":"Motor protection","Tightening torque":"Control circuit 15.05 lbf.in (1.7 N.m) screw clamp terminals Power circuit 79.7 lbf.in (9 N.m) screw clamp terminals","Climatic withstand":"IACS E10","Tripping threshold":"1.14 +/- 0.06 Ir IEC 60947-4-1","Dielectric strength":"1.89 kV 50 Hz IEC 60947-1","Mechanical robustness":"Vibrations6 Gn IEC 60068-2-6 Shocks15 Gn for 11 ms IEC 60068-2-7","Nbr. of units in pkg.":"1","Associated fuse rating":"4 A gG for signalling circuit 4 A BS for signalling circuit","Thermal overload class":"Class 20 IEC 60947-4-1","Connections - terminals":"Power circuit screw clamp terminals 1 0.006...0.05 in² (4...35 mm²) flexible without cable end Power circuit screw clamp terminals 1 0.006...0.05 in² (4...35 mm²) flexible with cable end Power circuit screw clamp terminals 1 0.006...0.05 in² (4...35 mm²) solid without cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) flexible without cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) flexible with cable end Control circuit screw clamp terminals 2 0.002...0.004 in² (1...2.5 mm²) solid without cable end","IP degree of protection":"IP20 conforming to IEC 60529","Temperature compensation":"-4...140 °F (-20...60 °C)","Phase failure sensitivity":"Tripping current 130 % of Ir on two phase, the last one at 0","Product or Component Type":"Non differential thermal overload relay","Auxiliary contact composition":"1 NO + 1 NC","[Ui] rated insulation voltage":"Power circuit 1000 V IEC 60947-4-1 Power circuit 600 V CSA Power circuit 600 V UL","[Ue] rated operational voltage":"690 V AC 0...400 Hz power circuit IEC 60947-4-1","Ambient Air Temperature for Storage":"-76...158 °F (-60...70 °C)","Thermal protection adjustment range":"37...50 A","Ambient air temperature for operation":"-4...140 °F (-20...60 °C) without derating IEC 60947-4-1","[Uimp] rated impulse withstand voltage":"6 kV IEC 60947-1","[Ith] conventional free air thermal current":"5 A signalling circuit"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$102.87 – $176.59","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0b544e4939b047efb6b35ef66d279ec3.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/LR3D3557/alternatives.json"},"ai":{"faq":[{"question":"What is the thermal adjustment range?","answer":"The relay adjusts from 37 to 50 A, with a Class 20 tripping characteristic per IEC 60947-4-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LR3D3557","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/LR3D3557 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:21:01.794Z","lastPublished":"2026-09-02T08:21:01.794Z","indexable":true}}