{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4KD0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4KD0","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4KD0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4KD0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU1146-4KD0 thermal overload relay, Size S3, CLASS 10, screw-type main terminals, Cage Clamp auxiliary terminals, IP20 front, ATEX certified, 140 mm depth, 70 mm width, 120 mm height.","salesMarkdown":"## Motor protection timing that matters at startup The 3RU1146-4KD0 is a SIRIUS thermal overload relay in the Size S3 frame, built for motor protection in the 55–65 A range. ## Terminal choices that save wiring time Main power circuit uses screw-type terminals accepting 2x (10…50 mm²) stranded or 1x (10…70 mm²) — covers the heavy wire for motor feeds. Mounts directly onto the contactor — the fastening method is contactor mounting, with the relay rotatable ±135° and tiltable ±45° on a vertical surface, giving you real flexibility when the panel layout is tight. ## Coordination and environmental limits Short-circuit coordination is specified with gG fuses: 160 A for Type 2 coordination (minimal damage), 250 A for Type 1 (device may need replacement but the circuit clears). Surge voltage withstand is 8 kV, so it sits comfortably in standard industrial installation categories. Operates from -20 to +70 °C, stores and transports from -55 to +80 °C, and handles 100 % relative humidity during operation. Shock resistance is 8g / 10 ms — it'll hold up on a vibrating conveyor or compressor skid. ## ATEX and IP20 for hazardous-area panels Carries ATEX certification (DMT 98 ATEX G 001), so it's approved for use in potentially explosive atmospheres when installed per the directive. Power dissipation per pole is 6.3 W — three poles at 18.9 W total. Factor that into your panel thermal budget, especially in a sealed enclosure with multiple relays stacked.","metaTitle":"Siemens 3RU1146-4KD0 SIRIUS Thermal Overload Relay, Size S3","metaDescription":"Siemens 3RU1146-4KD0 SIRIUS thermal overload relay, Size S3, CLASS 10 trip class, 140 mm depth. Active production. Quoted to order against BOM.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"70 mm","title":"3RU1146-4KD0","Height":"120 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Per Pole":"6.3 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","description":"Overload relay 57...75 A For motor protection Size S3, Class 10 Contactor mounting Main circuit: Screw terminal Auxiliary circuit: Spring-type terminal Manual-Automatic-Reset!!! Phased-out product!!! Successor is SIRIUS 3RU2 Preferred successor type is >>3RU2136-4RD0<<","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Contactor mounting","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","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"Cage Clamp terminals","Relative Humidity During Operation":"100 %","With Type Of Assignment 2 Required":"gG: 160 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 ... 14)","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Touch Protection Against Electrical Shock":"finger-safe","Finely Stranded Without Core End Processing":"2x (0.5 ... 1.5 mm²)","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":"18.9 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"57 ... 75 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$248.51","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6d3b09b3c358729edb21eda1e1b2bca2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=483486&mlfb=3RU1146-4KD0"},"ai":{"faq":[{"question":"What are the main circuit terminal sizes on this relay?","answer":"Main screw terminals accept 2x (10…50 mm²) stranded or 1x (10…70 mm²) stranded. For AWG, that's 2x (10…1/0) or 1x (10…2/0)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4KD0","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/3RU1146-4KD0 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}}