{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5146-4MB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5146-4MB1","canonicalUrl":"https://aoctrl.com/siemens/3RU5146-4MB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5146-4MB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU5146-4MB1, 3-pole, adjustable 80-100 A, Trip Class 10, screw terminals, 140 x 70 x 120 mm.","salesMarkdown":"Adjustable from 80 to 100 A, Trip Class 10, so it's sized for a motor that's pulling around that FLA range and needs a fast trip on a locked rotor (Class 10 means it trips in under 10 seconds at 7.2x the set current). Mounts standalone — no DIN-rail clip on this one, so it's screw-fixed to the panel backplate. Dimensions are 140 mm deep, 70 mm wide, 120 mm tall — that 70 mm width is the same as the S3 contactor frame it mates with, so a panel laid out for a 3RT5046 contactor will take this relay without re-spacing. Side clearance to grounded parts needs 6 mm minimum. The adjustable current range 80-100 A is the headline — set it to the motor's nameplate FLA, and the thermal bimetal element tracks the heating curve. The auxiliary contact circuit draws 1 A at 24 V, 0.22 A at 110 V, 2 A at 230 V — enough for a PLC input or a holding contact, not for direct motor switching.","metaTitle":"Siemens 3RU5146-4MB1 SIRIUS Thermal Overload Relay, 80-100 A","metaDescription":"Siemens 3RU5146-4MB1 SIRIUS thermal overload relay, adjustable 80-100 A, Trip Class 10, 3-pole, screw terminals, 140x70x120 mm. Current lifecycle stage. Sourced to order against RF","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Width":"70 mm","title":"3RU5146-4MB1","Height":"120 mm","at 24 V":"1 A","Per Pole":"7 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 80...100 A size S3, class 10 for motor protection for individual mounting main circuit: screw connection AUX. circuit: screw connection manual automatic reset","lifecycle_stage":"current","During Operation":"-20 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"stand-alone installation","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":"100 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":"21 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"80 ... 100 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/02709ba627af4ac9ac968a969f424926.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621460&mlfb=3RU5146-4MB1"},"ai":{"faq":[{"question":"What is the adjustable current range of the 3RU5146-4MB1?","answer":"Adjustable from 80 to 100 A, set via the dial on the front."},{"question":"What Trip Class is the 3RU5146-4MB1?","answer":"Trip Class 10 — trips in under 10 seconds at 7.2x the set current, suitable for standard motor starting."},{"question":"Will the 3RU5146-4MB1 fit a panel designed for a 3RT5046 contactor?","answer":"Yes — it's designed to combine with S3-size contactors (the 3RT5046 family), same 70 mm width and screw-terminal pattern."},{"question":"How do I get pricing and availability for the 3RU5146-4MB1?","answer":"Sourced and quoted to order against an RFQ; current pricing and availability are confirmed at quote time through our distribution channel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU5146-4MB1","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/3RU5146-4MB1 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}}