{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-3AF00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-3AF00","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-3AF00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-3AF00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1045-3AF00, 45 kW at 500 V AC-3, 37 kW at 400 V AC-2, screw-type terminals, DIN rail mount.","salesMarkdown":"It mounts on 35 mm or 75 mm standard DIN rail via screw and snap-on fastening, so it integrates into a standard panel layout without special bracketry. Rated 45 kW at 500 V in AC-3 duty, this contactor handles the inrush and run current of a standard squirrel-cage motor up to that power — the rating that matters for most conveyor, pump, and fan starts. The AC-2 rating of 37 kW at 400 V covers slip-ring motor applications where the load current stays closer to the run value during switching. For heavy jogging or plugging duty, the AC-4 rating of 66 A at 400 V tells you the thermal capacity under frequent reversing or inching cycles. The main circuit uses screw-type terminals accepting 2x (10... 50 mm²) stranded or 2x (0.25... 2.5 mm²) solid wire — sized for the motor feeder cable typical of a 45 kW load. Front-side protection is IP20 with a cover or box terminal; the terminal body itself is IP00, meaning the panel enclosure provides the environmental seal. The SIRIUS series typically carries UL, CSA, and CE approvals for global panel builds — verify the specific certification markings on the nameplate for your jurisdiction.","metaTitle":"Siemens 3RT1045-3AF00 SIRIUS Power Contactor, S3, 45 kW AC-3","metaDescription":"Siemens SIRIUS 3RT1045-3AF00 power contactor, size S3, rated 45 kW at 500 V AC-3, 37 kW at 400 V AC-2. Screw terminals, DIN rail mount. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"70 mm","at AC":"10 ... 25 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","at 50 Hz":"0.8 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"900 1/h","at AC-2 maximum":"400 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"300 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail","Size Of Contactor":"S3","Solid Or Stranded":"2x (2.5 ... 16 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"110 V","at 500 V rated value":"45 kW","at 690 V rated value":"21.1 kW","Side-By-Side Mounting":"Yes","at 1000 V rated value":"37 W","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"37 kW","at AC-4 at 400 V rated value":"66 A","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"50 mm²","at 60 °C minimum permissible":"35 mm²","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"38 kW","at 690 V at 60 °C rated value":"114 kW","at 1000 V at 60 °C rated value":"82 W","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 160 A","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 250 A","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Thermal Short-Time Current Limited To 10 S":"760 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","apparent holding power of magnet coil at AC":"22 VA","apparent pick-up power of magnet coil at AC":"270 VA","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.68","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.27","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"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=196916&mlfb=3RT1045-3AF00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-3AF00/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — 3RT1036-1AB00?","answer":"The 3RT1036-1AB00 is a smaller frame size (S2 vs S3) with lower current ratings. It will not drop into a panel specified around the 3RT1045-3AF00 without rewiring and verifying the motor load fits the lower rating. The 3RT1045-3AF00 is the correct size for 45 kW AC-3 loads."},{"question":"What compliance documentation does this contactor carry?","answer":"RoHS compliance is confirmed with a substance prohibition date of 05/01/2012. The SIRIUS series typically holds UL, CSA, and CE certifications; check the nameplate markings for your specific regulatory requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-3AF00","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/3RT1045-3AF00 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}}