{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5146-4JB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5146-4JB0","canonicalUrl":"https://aoctrl.com/siemens/3RU5146-4JB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5146-4JB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU5146-4JB0 thermal overload relay, 63 A, 3-pole, Class 10, screw-type terminals, 45-63 A adjustable range.","salesMarkdown":"The Siemens 3RU5146-4JB0 is a SIRIUS thermal overload relay sized for a 63 A motor circuit, with an adjustable current response value of 45 to 63 A. It mounts directly onto an S3-size contactor, so the assembly slides onto a DIN rail as a single unit. The 3-pole design handles three-phase motor loads up to 1000 V rated operating voltage, making it suitable for 400 V and 690 V distribution panels common in European and North American industrial lines. The 63 A rated operational current is the continuous ampacity through the main circuit. The adjustable range of 45 to 63 A lets you match the relay to the motor nameplate full-load amps, so one part number covers a spread of motor sizes. The 5.7 W power loss per pole (17.1 W total at rated current) means this relay will throw some heat inside the enclosure — account for that in your thermal budget, especially if you're packing several contactor-relay pairs side by side. Screw-type terminals on both the main and auxiliary circuits accept 2× (0.5 to 1.5 mm²) solid or 2× (0.75 to 2.5 mm²) finely stranded wire for the control side, and 2× (10 AWG to 1/0 AWG) for the power side. Tightening torque is 4 to 6 N·m on the main contacts. The auxiliary contacts are rated at 1 A at 24 V, 0.22 A at 110 V, and 2 A at 230 V — enough to signal a PLC input or drop out a holding circuit. The relay operates across -20 to +70 °C ambient and survives transport down to -55 °C. It's rated for 0 to 100 % relative humidity during operation, so condensation-prone environments are fine. Shock resistance is 8g for 10 ms per IEC 60068-2-27, and surge voltage resistance is 8 kV. Insulation voltage is 1000 V at pollution degree 3, meaning it's built for the dirty, damp conditions you find in a real plant. ## Mounting and Spacing The relay mounts directly onto an S3 contactor via the contactor mounting method, so the combined assembly snaps onto a DIN rail as one piece. The mounting position allows ±135° rotation and ±45° tilt forward and back from the vertical — useful for tight panel layouts. Required spacing to grounded parts at the side is 6 mm. Dimensions are 70 mm wide, 120 mm high, and 140 mm deep.","metaTitle":"Siemens 3RU5146-4JB0 SIRIUS Thermal Overload Relay, 63 A, Cl","metaDescription":"Siemens 3RU5146-4JB0 SIRIUS thermal overload relay, 63 A rated current, adjustable 45-63 A, Class 10 trip, 3-pole, screw terminals, current lifecycle status. RFQ for lead time.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Width":"70 mm","title":"3RU5146-4JB0","Height":"120 mm","at 24 V":"1 A","Per Pole":"5.7 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 45...63 A size S3, class 10 for motor protection for mounting onto contactors main circuit: screw terminal AUX. circuit: screw terminal manual automatic reset","lifecycle_stage":"current","During Operation":"-20 ... +70 °C","During Transport":"-55 ... +80 °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","For Main Current Circuit":"screw-type terminals","power loss [W] total typical":"16.5 W","Operating Voltage Rated Value":"1 000 V","Substance Prohibitance (Date)":"07/01/2006","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"63 A","for AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"0 ... 100 %","Surge Voltage Resistance Rated Value":"8 kV","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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","shock resistance according to IEC 60068-2-27":"8g / 10 ms","Required Spacing For Grounded Parts At The Side":"6 mm","Size Of Contactor Can Be Combined Company-Specific":"S3","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A, quick: 10 A","Tightening Torque For Main Contacts With Screw-Type Terminals":"4 ... 6 N·m","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/965404877c6d0c219abaf426ece1a141.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621249&mlfb=3RU5146-4JB0"},"ai":{"faq":[{"question":"What is the adjustable current range of the 3RU5146-4JB0?","answer":"The adjustable current response value ranges from 45 to 63 A, allowing it to protect motors with full-load amps in that band."},{"question":"What compliance documentation is available for the 3RU5146-4JB0?","answer":"The part carries a substance prohibitance date of 07/01/2006, indicating RoHS compliance. It is designed to IEC 60068-2-27 for shock and is rated for insulation voltage at pollution degree 3 per IEC standards."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU5146-4JB0","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/3RU5146-4JB0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}