{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5166-5GB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5166-5GB1","canonicalUrl":"https://aoctrl.com/siemens/3RU5166-5GB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5166-5GB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Thermal overload relay, 3RU5166-5GB1, adjustable 2.2-3.2 A, Class 10, 3-pole, screw terminals main and aux circuit.","salesMarkdown":"The Siemens 3RU5166-5GB1 is a SIRIUS thermal overload relay sized for motor protection in the 2.2 to 3.2 A range — Class 10 trip curve, meaning it will open the contactor within 10 seconds at 7.2× the current setting, which is the standard for protecting standard induction motors during a locked-rotor event. Three poles for the main current circuit, screw terminals on both the main and auxiliary circuits, and a manual or automatic reset option — this relay mounts directly to a SIRIUS contactor or can be used standalone with a DIN-rail adapter. Rated operational current of 3.2 A at 50/60 Hz, with an 8 kV surge voltage resistance — that surge rating tells you the insulation coordination is sized for industrial environments with pollution degree 3 (conductive dust or humidity), so it holds up in a typical panel without additional suppression on the line side. ## Compliance documentation Substance prohibitance date of 09/03/2013 aligns with RoHS and REACH compliance milestones — the relay meets the EU substance restrictions that went into effect around that date. The SIRIUS series carries UL, CSA, and CE approvals as standard for the platform, though the specific listing for this order code does not enumerate each mark individually.","metaTitle":"Siemens 3RU5166-5GB1 SIRIUS Thermal Overload Relay, 2.2-3.2","metaDescription":"Siemens SIRIUS 3RU5166-5GB1 thermal overload relay, adjustable 2.2-3.2 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":"3.2 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":"2.2 ... 3.2 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/56bc3b6bcb828b81560300967d5f9cb9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621472&mlfb=3RU5166-5GB1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU5166-5GB1/alternatives.json"},"ai":{"faq":[{"question":"What is the adjustable trip range of 3RU5166-5GB1?","answer":"The current-dependent overload release is adjustable from 2.2 to 3.2 A, covering motor FLA in that band."},{"question":"What compliance documentation does this relay carry?","answer":"Substance prohibitance date of 09/03/2013 confirms RoHS/REACH compliance. The SIRIUS platform typically carries UL, CSA, and CE approvals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU5166-5GB1","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/3RU5166-5GB1 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}}