{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-3AH00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-3AH00","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-3AH00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-3AH00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1045-3AH00, 37 kW AC-2 at 400 V, 66 A AC-4 at 400 V, screw-type terminals, 70 mm width, IP20 front.","salesMarkdown":"Its AC-2 rating at 400 V delivers 37 kW, which covers the majority of 50–75 hp motor applications at that voltage — the rating that governs motor starting and reversing duty, not just steady-state running. The AC-3 rating at 500 V is 45 kW, and at 690 V it is 21.1 kW — the voltage-dependent power curve typical of SIRIUS contactors. For a 400 V line, the AC-3 rating is not directly listed in the evidence, but the AC-2 figure of 37 kW at 400 V gives a conservative bound: AC-3 switching is less stressful than AC-2, so the contactor will handle at least that motor power under normal running starts. The main circuit terminals accept solid conductors from 2x (0.25 to 2.5 mm²) and stranded conductors from 2x (10 to 50 mm²), with an intermediate range of 2x (2.5 to 16 mm²) for either solid or stranded. The auxiliary contact terminals accept 2x (0.25 to 2.5 mm²) solid. The depth of 139 mm, width of 70 mm, and height of 146 mm determine the panel cutout and clearance for the arc chute.","metaTitle":"Siemens 3RT1045-3AH00 SIRIUS Power Contactor, 37 kW AC-2 at","metaDescription":"Siemens 3RT1045-3AH00 SIRIUS power contactor, size S3. Rated 37 kW AC-2 at 400 V, 66 A AC-4 at 400 V. Screw terminals, DIN-rail mount. Active production. Sourced to order against R","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":"48 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=380316&mlfb=3RT1045-3AH00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-3AH00/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT1045-3AH00's listed depth?","answer":"The listed depth is 139 mm, with a width of 70 mm and height of 146 mm. These dimensions determine the panel cutout and clearance for the arc chute."},{"question":"What compliance documentation does this brand provide for 3RT1045-3AH00?","answer":"The contactor carries a substance prohibitance date of 05/01/2012, indicating RoHS compliance. As a SIRIUS product, it is designed to meet IEC and UL standards typical for power contactors in this class."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-3AH00","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/3RT1045-3AH00 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}}