{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LRD15306","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LRD15306","canonicalUrl":"https://aoctrl.com/schneider/LRD15306","factsUrl":"https://aoctrl.com/api/mcp/products/LRD15306","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys Deca LRD15306 differential thermal overload relay, 23-28 A, Class 20, obsolete.","salesMarkdown":"The Schneider Electric TeSys LRD15306 is a differential thermal overload relay from the TeSys Deca series, designed for motor protection in three-phase circuits. It provides Class 20 overload protection with a thermal protection adjustment range of 23 to 28 A, meaning it can handle motor full-load currents within that band and trip within the Class 20 curve (typically 20 seconds at 7.2× Ir). The relay is rated for operation on AC networks up to 690 V at 0–400 Hz, with an impulse withstand voltage of 6 kV. It complies with EN/IEC 60947-4-1 and -5-1, plus UL and CSA equivalents, so it fits into panels built to either IEC or North American code. Phase failure sensitivity is built in: it trips at 130 % of Ir on two phases when the third is at zero, which protects motors against single-phasing. Because it is obsolete, there is no official manufacturer successor listed for this specific code. If a direct replacement is needed, a parametric cross-reference within the TeSys family may be possible, but that depends on the mounting, current range, and auxiliary contact configuration required. A sourcing specialist can confirm fit against the original application. The 23–28 A adjustment range is the key selection parameter: it must match the motor's full-load current (FLC). Class 20 tripping means the relay allows a moderate overload before tripping — suitable for standard induction motors that can handle a brief 20-second start or stall without damage. The ambient operating range of -20 to 60 °C without derating covers most indoor panel environments, but if the panel runs hotter than 60 °C, the relay must be derated or relocated. The auxiliary contact composition is 1 NO + 1 NC, which is standard for signalling the tripped state back to a PLC or contactor coil circuit. The signalling circuit is rated for 1.5 A at 240 V AC-15 and 0.1 A at 250 V DC-13 — enough for a typical PLC input or relay coil, but not for direct motor switching. Mounting options include plate or rail with specific accessories, or directly under the contactor.","metaTitle":"TeSys LRD15306 Thermal Overload Relay, 23-28 A, Class 20","metaDescription":"Obsolete TeSys LRD15306 differential thermal overload relay, 23-28 A, Class 20. Sourced to order against RFQ. IEC/UL/CSA certified.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Depth":"92 mm","Range":"TeSys","Width":"45 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","Control type":"Red push-button: stop Blue push-button: reset","Network type":"DC AC","Product name":"TeSys LRD TeSys Deca","Fire resistance":"850 °C conforming to IEC 60695-2-1","lifecycle_stage":"current","Connection pitch":"17.5 mm","Flame retardance":"V1 conforming to UL 94","Mounting support":"Plate, with specific accessories Rail, with specific accessories Under contactor","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: 2.3 N.m - on lugs-ring terminals M4","Climatic withstand":"conforming to IACS E10","Tripping threshold":"1.14 +/- 0.06 Ir conforming to IEC 60947-4-1","Dielectric strength":"1.89 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 20 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: 600 V conforming to CSA Power circuit: 600 V conforming to UL Power circuit: 690 V conforming to IEC 60947-4-1","[Ue] rated operational voltage":"690 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":"23...28 A","Ambient air temperature for operation":"-20...60 °C without derating conforming to IEC 60947-4-1","[Uimp] rated impulse withstand voltage":"6 kV","[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/96ee49aaf7e47fd8645336c0c445a729.pdf","sourceUrl":"https://www.se.com/vn/en/product/LRD15306/tesys-deca-thermal-overload-relays-23-28-a-class-20/","alternativesUrl":"https://aoctrl.com/api/mcp/products/LRD15306/alternatives.json"},"ai":{"faq":[{"question":"What is the closest alternative to the LRD15306?","answer":"There is no official manufacturer successor listed for this order code. A parametric cross-reference within the TeSys family may be possible, but the exact replacement depends on the current range (23–28 A), mounting style, and auxiliary contact configuration (1 NO + 1 NC) required. A sourcing specialist can help identify a suitable alternative."},{"question":"What compliance documentation does the LRD15306 carry?","answer":"The relay complies with EN/IEC 60947-4-1, EN/IEC 60947-5-1, UL 60947-4-1, UL 60947-5-1, and CSA C22.2 No 60947-4-1 and 60947-5-1. It also meets IEC 60695-2-1 (850 °C glow wire) and UL 94 V1 flame retardance."},{"question":"What is the depth of the LRD15306?","answer":"The depth is 92 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LRD15306","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/LRD15306 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}}