{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7146-4JB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7146-4JB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7146-4JB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7146-4JB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU7146-4JB0, Size S3, 3-pole, 63 A rated operational current, CLASS 10 trip, screw terminals.","salesMarkdown":"The Siemens SIRIUS 3RU7146-4JB0 is a Size S3 thermal overload relay for 3-pole motor circuits, rated at 63 A operational current and 1000 V operating voltage (AC/DC). Its CLASS 10 trip characteristic means it will trip within 10 seconds at 7.2× the current setting — the standard for standard-start induction motors where the start time is under 10 seconds. The relay mounts directly onto a SIRIUS S3 contactor (contactor mounting) and is wired via screw-type terminals on both the main and auxiliary circuits. The 63 A rated operational current (AC-1/AC-3) determines the maximum motor FLA you can protect — size the relay so the motor's full-load amps fall within the adjustable range of the relay's thermal element. Terminals accept 2× (0.5 to 1.5 mm²) solid/stranded or 2× (0.75 to 2.5 mm²) finely stranded with ferrule; torque the main circuit screws to 4–6 N·m and auxiliary screws to 0.8–1.2 N·m. Mounting position is flexible — vertical surface with ±135° rotation and ±45° tilt — but the ambient operating range is -20 to +55 °C; derate above 40 °C if the load is continuous. It is a standard catalog item from the Siemens SIRIUS line — order to specification, no last-time-buy constraints.","metaTitle":"Siemens SIRIUS 3RU7146-4JB0 Thermal Overload Relay, 63 A, CL","metaDescription":"Siemens SIRIUS 3RU7146-4JB0 thermal overload relay, 63 A rated current, CLASS 10 trip, 3-pole, IP20 front / IP00 terminals. Currently in 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":"5.7 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":"17.1 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":"63 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":"17.1 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"45 ... 63 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":"https://cdn.aoctrl.com/7f4679242bb7926c9ef2b866c68190a1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1542627&mlfb=3RU7146-4JB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7146-4JB0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to the 3RU7146-4JB0?","answer":"The 3RT1044-1FB46 is a SIRIUS contactor in the same S3 frame size, but it is a contactor, not a thermal overload relay — the 3RU7146-4JB0 mounts directly onto it for coordinated motor protection, but they are not drop-in substitutes for each other."},{"question":"What are the key ratings for this overload relay?","answer":"Rated operational current 63 A, rated operating voltage 1000 V AC/DC, CLASS 10 trip, 3-pole, total power loss 17.1 W at rated current, IP20 front / IP00 terminals."},{"question":"What wire sizes and torque specs apply?","answer":"Main circuit terminals accept 2×(0.5–1.5 mm²) solid or 2×(0.75–2.5 mm²) finely stranded, torqued to 4–6 N·m. Auxiliary terminals accept the same wire sizes at 0.8–1.2 N·m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7146-4JB0","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/3RU7146-4JB0 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}}