{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5176-5HB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5176-5HB1","canonicalUrl":"https://aoctrl.com/siemens/3RU5176-5HB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5176-5HB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU5176-5HB1 thermal overload relay, Class 10, adjustable 2.8-4 A, 3-pole, size S12, screw terminals, manual/auto reset.","salesMarkdown":"The 3RU5176-5HB1: The adjustable current response range is 2.8 to 4 A, which is the critical number for the buyer: set the dial to match the motor's full-load amps. This is a Class 10 relay, meaning it will trip within 10 seconds at 7.2× the current setting — standard for general-purpose motor starting where the acceleration time is under 10 seconds. Three poles for the main current circuit, covering the three phases. The description confirms it's for single mounting, with screw terminals on both the main and auxiliary circuits, and supports both manual and automatic reset modes. This relay mounts directly onto a SIRIUS S12 contactor or separately on a DIN rail. The screw terminals on the main circuit handle the motor leads; the auxiliary circuit screw terminals handle the control wiring for the reset and trip-indication functions. The operating frequency is rated for 50 to 60 Hz, so it covers both common line frequencies without derating. Relative humidity during operation is 0 to 100 % — it handles condensing environments, though the enclosure around it should still be rated for the location. The substance prohibitance date of 09/03/2013 confirms RoHS compliance for the EU market. For a buyer filling a BOM line, the 2.8-4 A range and Class 10 trip curve are the fit confirmation points. If your motor's FLA is within that window and your starting duty is standard (not high-inertia), this relay is a direct drop-in for the S12 contactor platform.","metaTitle":"Siemens 3RU5176-5HB1 SIRIUS Thermal Overload Relay, 2.8-4 A","metaDescription":"Siemens SIRIUS 3RU5176-5HB1 thermal overload relay, adjustable 2.8-4 A, Class 10, 3-pole, size S12. Screw terminals, manual/auto reset. Current lifecycle stage — active production.","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":"4 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":"2.8 ... 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/df1fb3d133fb917017cd6ed52213527d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621473&mlfb=3RU5176-5HB1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU5176-5HB1/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this overload relay?","answer":"The adjustable current response range is 2.8 to 4 A. It is a Class 10 thermal overload relay with 3 poles, rated for 50/60 Hz operation. The surge voltage resistance is 8 kV, and it operates in 0 to 100 % relative humidity."},{"question":"What compliance documentation does this relay carry?","answer":"The substance prohibitance date of 09/03/2013 indicates RoHS compliance. As a Siemens SIRIUS product, it carries CE marking and is designed to meet IEC 60947-4-1 for motor protection."},{"question":"Will the 3RU5176-5HB1 fit a panel designed for a 3RT2045-3KB44-3MA0 contactor?","answer":"No direct mechanical compatibility is confirmed. The 3RU5176-5HB1 is a size S12 overload relay, while the 3RT2045-3KB44-3MA0 is a size S3 contactor. These are different frame sizes and are not designed to mount together. The 3RU5176-5HB1 mates with SIRIUS S12 contactors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU5176-5HB1","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/3RU5176-5HB1 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}}