{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4MB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4MB1","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4MB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4MB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU1146-4MB1, Size S3, CLASS 10, screw-type terminals, IP20 front, 140 x 70 x 120 mm.","salesMarkdown":"Mounts standalone (stand-alone installation) on a vertical surface, rotatable ±135° and tiltable ±45° front-to-back, so it fits tight enclosures where the contactor is already fixed. The 70 mm width and 120 mm height are standard for the S3 frame; the 140 mm depth leaves clearance for the screw-type terminals on both the main and auxiliary circuits. Main circuit terminals accept solid 2x (0.5…1.5 mm²) and 2x (0.75…2.5 mm²) or stranded up to 70 mm². For auxiliary contacts, AWG 20–16 and 18–14. Coordination: with type 2 coordination requires a 200 A gG fuse upstream; type 1 coordination allows 250 A gG. That's the fuse sizing the panel builder needs to avoid welding the overload's N/C contacts on a bolted fault.","metaTitle":"Siemens 3RU1146-4MB1 SIRIUS Thermal Overload Relay, CLASS 10","metaDescription":"Siemens 3RU1146-4MB1 SIRIUS thermal overload relay, CLASS 10, Size S3, screw terminals, IP20 front. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"70 mm","Height":"120 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Per Pole":"7 W","Stranded":"2x (10 ... 50 mm²), 10 ... 70 mm²","at 110 V":"0.22 A","at 120 V":"3 A","at 125 V":"0.22 A","at 220 V":"0.11 A","at 230 V":"2 A","at 400 V":"1 A","Backwards":"0 mm","Downwards":"0 mm","Trip Class":"CLASS 10","At The Side":"6 mm","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"stand-alone installation","Shock Resistance":"8g / 10 ms","Mounting Position":"with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back","Product Brand Name":"SIRIUS","Type Of Protection":"DMT 98 ATEX G 001","Product Designation":"thermal overload relay","Size Of Overload Relay":"S3","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"100 %","With Type Of Assignment 2 Required":"gG: 200 A","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 250 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","reference code according to IEC 81346-2":"F","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","Touch Protection Against Electrical Shock":"finger-safe","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Size Of Contactor Can Be Combined Company-Specific":"S3","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A, quick: 10 A","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=535836&mlfb=3RU1146-4MB1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4MB1/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between 3RU1146-4MB1 and 3RU2146-4MB1?","answer":"The 3RU1146-4MB1 is a Size S3 overload relay in the SIRIUS series, while the 3RU2146-4MB1 is a different variant within the same family. The key difference is the frame size and current range — the S3 frame (this part) is sized for higher motor currents than the smaller S0 or S2 frames. Without the full spec sheet for the 3RU2146-4MB1, the exact current overlap cannot be stated, but the mounting footprint and terminal capacity differ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4MB1","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/3RU1146-4MB1 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}}