{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7146-4HB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7146-4HB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7146-4HB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7146-4HB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU7146-4HB0 thermal overload relay, S3 size, 50 A rated operational current, Class 10 trip, screw terminals, contactor mounting.","salesMarkdown":"The Siemens 3RU7146-4HB0 is a SIRIUS S3 thermal overload relay rated for 50 A operational current, designed to protect three-phase AC/DC motor circuits against overload and phase failure. The thermal bimetallic release follows a Class 10 trip characteristic, meaning it must trip within 10 seconds at 7.2× the set current — the standard for standard-start induction motors on conveyors, pumps, and fans where the start-up time is under 10 seconds. Fastens directly onto a S3-size contactor (no DIN rail bracket needed), which saves panel width. The relay itself is 70 mm wide, 120 mm tall, and 140 mm deep — dimensions that matter when you're swapping into an existing panel layout. Mounting position allows ±135° rotation and ±45° tilt from vertical, giving flexibility in tight enclosures. Screw terminals on both main and auxiliary circuits: main terminals torque to 4–6 N·m, auxiliary to 0.8–1.2 N·m. Accepts 2× (0.5–1.5 mm²) or 2× (0.75–2.5 mm²) solid/stranded wire. Operates from -20 to +55 °C, with 0–90% relative humidity. Installation altitude max 2 000 m. Rated insulation voltage 1 000 V AC (pollution degree 3), surge voltage resistance 8 kV.","metaTitle":"Siemens 3RU7146-4HB0 SIRIUS Thermal Overload Relay, 50 A, Cl","metaDescription":"Siemens SIRIUS 3RU7146-4HB0 thermal overload relay, 50 A rated current, Class 10 trip, S3 size for contactor mounting. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Width":"70 mm","Height":"120 mm","at 24 V":"3 A","Per Pole":"5.1 W","at 230 V":"2 A","Trip Class":"CLASS 10","On The Front":"IP20","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-20 ... +55 °C","During Transport":"-25 ... +70 °C","Fastening Method":"Contactor mounting","Mounting Position":"with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Thermal overload relay","Size Of Overload Relay":"S3","For Main Current Circuit":"screw-type terminals","power loss [W] total typical":"15.3 W","Operating Voltage Rated Value":"1 000 V","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"50 A","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"0 ... 90 %","Surge Voltage Resistance Rated Value":"8 kV","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Type Of Voltage For Main Current Circuit":"AC/DC","For Main Contacts With Screw-Type Terminals":"4 ... 6 N·m","shock resistance according to IEC 60068-2-27":"8g / 10 ms","Required Spacing For Grounded Parts At The Side":"6 mm","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","Size Of Contactor Can Be Combined Company-Specific":"S3","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","operational current of auxiliary contacts at DC-13 at 24 V":"1 A","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","power loss [W] for rated value of the current at AC in hot operating state":"15.3 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"36 ... 50 A","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A, quick: 10 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=1542626&mlfb=3RU7146-4HB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7146-4HB0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings I need to check for fit?","answer":"Rated operational current is 50 A, trip class is Class 10, and it mounts directly onto an S3-size contactor (not on DIN rail). The auxiliary contacts are rated 3 A at 24 V and 2 A at 230 V. Front IP20, terminals IP00."},{"question":"Will this drop into a panel built for a 3RT1044-1FB46 contactor?","answer":"The 3RU7146-4HB0 is an S3-size relay designed to mount on an S3-size contactor. The 3RT1044-1FB46 is also an S3 contactor, so the physical fit and screw-terminal pattern should match. Verify the contactor's S3 designation in your panel documentation before ordering."},{"question":"What compliance documentation is available for this part?","answer":"The evidence does not list specific RoHS, REACH, UL, or IEC certificates. Siemens SIRIUS products typically carry CE and UL/CSA markings, but confirm with the datasheet or your Siemens contact for the exact declaration of conformity for this order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7146-4HB0","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/3RU7146-4HB0 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}}