{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AL26","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AL26","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AL26","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AL26","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1045-1AL26, 45 kW at 500 V, 21.1 kW at 690 V, screw-type terminals, snap-on DIN rail.","salesMarkdown":"## Siemens 3RT1045-1AL26 SIRIUS Power Contactor — Size S3, 45 kW at 500 V The Siemens 3RT1045-1AL26 is a SIRIUS power contactor in size S3, rated for 45 kW at 500 V and 21.1 kW at 690 V. Front protection is IP20 with cover or box terminal; the terminal itself is IP00. Pollution degree 3 rated, operating temperature range -25 to +60 °C, storage -55 to +80 °C. ## Duty Ratings and Switching Life The 3RT1045-1AL26 is rated for AC-3 duty at 1 000 operations per hour and AC-4 at 300 operations per hour. AC-1 resistive load maximum is 900 operations per hour. Typical mechanical life is 10 000 000 operations. Coil operating range at 50 Hz is 0.8 to 1.1 times rated voltage, at 60 Hz 0.85 to 1.1. Auxiliary contacts are rated 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, and 3 A at 400 V. Power dissipation at 1000 V is 37 W. Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max. 2x (0.75 to 4 mm²). Stranded conductors: 2x (10 to 50 mm²). Solid or stranded: 2x (2.5 to 16 mm²). Dimensions: depth 139 mm, width 90 mm, height 146 mm.","metaTitle":"Siemens 3RT1045-1AL26 SIRIUS Power Contactor, 45 kW at 500 V","metaDescription":"Siemens 3RT1045-1AL26 SIRIUS power contactor, size S3, 45 kW at 500 V, 21.1 kW at 690 V. Screw terminals, snap-on DIN rail. Active lifecycle, sourced to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"90 mm","at AC":"10 ... 25 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","2 Rated Value":"60 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":"230 V","at 500 V rated value":"45 kW","at 60 Hz rated value":"230 V","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":"screw-type 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 (20 ... 16), 2x (18 ... 14), 1x 12","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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 (10 ... 35 mm²)","apparent holding power of magnet coil at AC":"27 VA","apparent pick-up power of magnet coil at AC":"298 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":"0.7","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.29","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":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","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=7571&mlfb=3RT1045-1AL26","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AL26/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1045-1AL26?","answer":"The closest functional peer is the 3RT1044-1FB46, which is a size S2 contactor with a lower power rating. The 3RT1045-1AL26 is size S3 and offers higher current capacity (45 kW at 500 V vs. the S2 rating). Panel rewiring would be required due to different terminal sizes and mounting footprint."},{"question":"Will 3RT1045-1AL26 drop into a panel specified for 3RT1044-1FB46?","answer":"No, the 3RT1045-1AL26 is size S3 (146 x 90 x 139 mm) while the 3RT1044-1FB46 is size S2. The larger dimensions and different terminal arrangement mean it will not fit without panel modifications and rewiring."},{"question":"Where can I buy 3RT1045-1AL26?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AL26","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/3RT1045-1AL26 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}}