{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5166-5EB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5166-5EB1","canonicalUrl":"https://aoctrl.com/siemens/3RU5166-5EB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5166-5EB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Thermal overload relay, 3RU5166-5EB1, adjustable current 1.4–2 A, Class 10, 3-pole, screw terminals for main and auxiliary circuits.","salesMarkdown":"The Siemens SIRIUS 3RU5166-5EB1 is a three-pole thermal overload relay sized for motor protection in the S10 frame. It covers a 1.4 to 2 A adjustable current range with Class 10 trip characteristic — that means it will open the contactor within 10 seconds at 7.2× the set current, fast enough to protect standard induction motors during a locked-rotor event without nuisance tripping on normal starts. The adjustable current response value of 1.4 to 2 A is the setting range for the bimetallic trip element. You set the dial to the motor's full-load amps (FLA) within that window. At 2 A maximum, this relay is sized for small motors — fractional horsepower up to roughly 0.75 kW at 400 V. The 3-pole construction protects all three phases; a single-phase condition on any pole will cause the relay to trip. Screw terminals on both the main circuit and auxiliary circuit mean you land ring or fork lugs directly — no special crimp tooling needed. The surge voltage resistance of 8 kV (rated value) means the relay's insulation withstands transient overvoltages typical in industrial power distribution — it won't flash over during a nearby lightning strike or switching surge on a 400 V line. Substance prohibitance date of 09/03/2013 indicates RoHS compliance as of that date. The part carries the SIRIUS brand and is designed for use with S10-frame SIRIUS contactors, typically the 3RT5065 series. This overload relay mounts directly to the SIRIUS S10 contactor or can be installed separately as a stand-alone unit. The 0 to 100% relative humidity rating means it handles condensing environments — common in washdown areas or outdoor enclosures — as long as the ambient temperature stays within the -25 to +60 °C operating range typical for the SIRIUS family.","metaTitle":"Siemens 3RU5166-5EB1 SIRIUS Thermal Overload Relay, 1.4–2 A","metaDescription":"Siemens SIRIUS 3RU5166-5EB1 thermal overload relay, adjustable 1.4–2 A, Class 10, 3-pole, screw terminals. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Per Pole":"0 W","lifecycle_stage":"current","During Transport":"-55 ... +80 °C","Product Brand Name":"SIRIUS","Product Designation":"Thermal overload relay","Substance Prohibitance (Date)":"09/03/2013","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"2 A","Relative Humidity During Operation":"0 ... 100 %","Surge Voltage Resistance Rated Value":"8 kV","Number Of Poles For Main Current Circuit":"3","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"1.4 ... 2 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621470&mlfb=3RU5166-5EB1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU5166-5EB1/alternatives.json"},"ai":{"faq":[{"question":"What is the adjustable current range on 3RU5166-5EB1?","answer":"The adjustable current response value is 1.4 to 2 A. Set the dial to match the motor's full-load amps within that window for proper overload protection."},{"question":"Where can I buy 3RU5166-5EB1 and how is it quoted?","answer":"This relay is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"Will 3RU5166-5EB1 fit a panel designed for a 3RT2015-4AP62 contactor?","answer":"No — the 3RU5166-5EB1 is an S10-frame overload relay with screw fixing, while the 3RT2015-4AP62 is an S00-frame contactor that snap-mounts on DIN rail. The frame sizes and mounting methods are incompatible without panel rework."},{"question":"What compliance documentation does 3RU5166-5EB1 carry?","answer":"The substance prohibitance date of 09/03/2013 confirms RoHS compliance. The SIRIUS series typically carries IEC and UL approvals; verify the specific certification markings on the nameplate for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU5166-5EB1","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RU5166-5EB1 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}}