{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AU00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AU00","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AU00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AU00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1045-1AU00 power contactor, Size S3, screw-type terminals, 37 kW at 400 V AC-2, 70 x 146 x 139 mm, IP20 front.","salesMarkdown":"## SIRIUS 3RT1045-1AU00 — Power Contactor, Size S3 For AC-3 squirrel-cage motor switching, the 500 V rating is 45 kW, and at 690 V it is 21.1 kW. The contactor mounts on 35 mm or 75 mm DIN rail via screw and snap-on fastening. Side-by-side mounting is permitted, which simplifies panel layout for multi-contactor groups. The enclosure provides IP20 on the front with the cover or box terminal fitted; the terminal area itself is IP00, so it expects a panel environment where the busbars and wiring are behind a deadfront. The AC-4 rating of 66 A at 400 V covers plugging and inching, where the contactor breaks full motor current. The AC-3 rating at 500 V is 45 kW, suitable for standard squirrel-cage motors on pumps or fans. The coil is rated for 50 Hz at 240 V, with an operating range of 0.8 to 1.1 times the rated voltage. The auxiliary contact ratings are: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V. These are the switching capacities for the built-in auxiliary contacts, not the main poles. ## Wiring and Terminal Data Solid wire connections: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded wire: 2x (10 to 50 mm²). For the auxiliary and control circuit, solid or stranded wire: 2x (2.5 to 16 mm²).","metaTitle":"Siemens 3RT1045-1AU00 SIRIUS Power Contactor, Size S3, 37 kW","metaDescription":"Siemens SIRIUS 3RT1045-1AU00 power contactor, Size S3. AC-2 motor switching at 37 kW / 400 V. Screw terminals, 70 mm width, IP20 front. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 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":"240 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":"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":"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=83575&mlfb=3RT1045-1AU00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AU00/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"Width is 70 mm, height is 146 mm, depth is 139 mm. It mounts on 35 mm or 75 mm DIN rail and permits side-by-side mounting."},{"question":"What compliance documentation is available?","answer":"The product carries a RoHS compliance date of 05/01/2012. As a Siemens SIRIUS component, it is designed to meet IEC and UL standards for industrial control equipment."},{"question":"What is the closest functional alternative within the SIRIUS range?","answer":"The 3RT1036-1AB00 is a smaller Size S2 contactor in the same SIRIUS family. It will not drop into a panel wired for the Size S3 3RT1045-1AU00 without rewiring, as the terminal sizes and mounting footprint differ. The 3RT1045-1AU00 is the correct Size S3 part for 37 kW AC-2 duty."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AU00","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/3RT1045-1AU00 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}}