{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LRD3321A66","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LRD3321A66","canonicalUrl":"https://aoctrl.com/schneider/LRD3321A66","factsUrl":"https://aoctrl.com/api/mcp/products/LRD3321A66","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys Deca differential thermal overload relay, LRD3321A66, 12-18 A, Class 10A, 1000 V AC.","salesMarkdown":"The Schneider LRD3321A66 is a TeSys Deca differential thermal overload relay for motor protection, with a thermal protection adjustment range of 12-18 A and a Class 10A tripping curve per IEC 60947-4-1. It protects three-phase motors against overload, phase failure, and phase unbalance — the phase failure sensitivity trips at 130% of Ir on two phases with the third at zero current. Rated insulation voltage (Ui) is 1000 V per IEC for the power circuit, and the impulse withstand voltage (Uimp) is 6 kV per IEC 60947-1. The 12-18 A adjustment range matches a motor full-load current in that band. Class 10A allows the relay to ride through normal starting inrush without nuisance tripping. The signalling circuit is rated 1.5 A at 240 V AC-15 and 0.1 A at 250 V DC-13 — these are the contact ratings for the 1 NO + 1 NC auxiliary contacts, so the relay can directly switch a PLC input or contactor coil within those limits. IP20 finger-safe protection means it is suitable for enclosure mounting where no washdown or dust ingress is expected — standard for a panel-mounted overload relay. The LRD3321A66 carries approvals to 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, and GB/T 14048.4/5 — covering global motor protection and control circuit standards. Flame retardance is V1 per UL 94, and climatic withstand conforms to IACS for marine or humid environments.","metaTitle":"Schneider LRD3321A66 TeSys Deca Thermal Overload Relay, 12-1","metaDescription":"Obsolete Schneider LRD3321A66 TeSys Deca thermal overload relay, 12-18 A, Class 10A, 1000 V. Sourced to order against RFQ. UL/CSA/IEC certified.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Overload Relays"],"specifications":{"Depth":"115 mm","Range":"TeSys","Width":"70 mm","Height":"81 mm","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":"DC AC","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","Device short name":"LRD","Network frequency":"0...400 Hz","Relay application":"Motor protection","Tightening torque":"Control circuit: 1.7 N.m - on screw clamp terminals Power circuit: 11.3 N.m - on lugs-ring terminals M10","Climatic withstand":"conforming to IACS E10","Tripping threshold":"1.14 +/- 0.06 Ir conforming to IEC 60947-4-1","Dielectric strength":"2.2 kV at 50 Hz conforming to IEC 60947-1","Permissible current":"1.5 A at 240 V AC-15 for signalling circuit 0.1 A at 250 V DC-13 for signalling circuit","Mechanical robustness":"Vibrations: 6 Gn conforming to IEC 60068-2-6 Shocks: 15 Gn for 11 ms conforming to IEC 60068-2-7","Associated fuse rating":"4 A gG for signalling circuit 4 A BS for signalling circuit","Thermal overload class":"Class 10A conforming to IEC 60947-4-1","Connections - terminals":"Control circuit: screw clamp terminals 2 cable(s) 1...2.5 mm² flexible without cable end Control circuit: screw clamp terminals 2 cable(s) 1...2.5 mm² flexible with cable end Control circuit: screw clamp terminals 2 cable(s) 1...2.5 mm² solid without cable end Power circuit: lugs-ring terminals","IP degree of protection":"IP20 conforming to IEC 60529","Temperature compensation":"-20...60 °C","Phase failure sensitivity":"Tripping current 130 % of Ir on two phase, the last one at 0","Product or component type":"Differential thermal overload relay","Auxiliary contact composition":"1 NO + 1 NC","[Ui] rated insulation voltage":"Power circuit: 1000 V conforming to IEC 60947-4-1 Power circuit: 600 V conforming to CSA Power circuit: 600 V conforming to UL","[Ue] rated operational voltage":"1000 V AC 0...400 Hz for power circuit conforming to IEC 60947-4-1","Ambient air temperature for storage":"-60...70 °C","Thermal protection adjustment range":"12...18 A","Ambient air temperature for operation":"-20...60 °C without derating conforming to IEC 60947-4-1","[Uimp] rated impulse withstand voltage":"6 kV conforming to IEC 60947-1","[Ith] conventional free air thermal current":"5 A for signalling circuit"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cc3d23b14809b126ed04efa50e6098be.pdf","sourceUrl":"https://www.se.com/nz/en/product/LRD3321A66/tesys-deca-thermal-overload-relays-12-18-a-class-10a-1000-v/","alternativesUrl":"https://aoctrl.com/api/mcp/products/LRD3321A66/alternatives.json"},"ai":{"faq":[{"question":"What is the thermal protection adjustment range?","answer":"The adjustment range is 12-18 A, set via the dial on the front of the relay."},{"question":"What standards does this relay comply with?","answer":"It complies with 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, and GB/T 14048.4/5."},{"question":"What is the auxiliary contact configuration?","answer":"It has 1 normally-open (NO) and 1 normally-closed (NC) auxiliary contact."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LRD3321A66","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/LRD3321A66 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}}