{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AD04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AD04","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AD04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AD04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1045-1AD04 power contactor, Size S3, 45 kW at 400 V AC-3, 37 kW AC-2, 66 A AC-4, screw-type terminals, IP20 front, snap-on 35/75 mm rail.","salesMarkdown":"## Siemens SIRIUS 3RT1045-1AD04 — Power Contactor, Size S3 The Siemens SIRIUS 3RT1045-1AD04 is a Size S3 power contactor rated for 45 kW at 400 V in AC-3 duty, making it the primary spec for switching standard three-phase induction motors — pumps, fans, compressors — up to that load. It also carries a 37 kW rating at 400 V in AC-2 duty, which covers slip-ring motor starting, and a 66 A rating in AC-4 for reversing or inching applications where the contactor makes and breaks the motor at full current. Side-by-side mounting is permitted, which saves rail space in dense cabinets. The main circuit uses screw-type terminals, and the control circuit accepts solid wire from 2x (0.5... 1.5 mm²) up to max 2x (0.75... 4 mm²), with stranded going up to 2x (10... 50 mm²). The enclosure is rated IP20 on the front with cover or box terminal; the terminal itself is IP00, so it's meant for installation inside a panel, not exposed to washdown. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C, and the degree of pollution is 3, meaning it's suitable for industrial environments with conductive dust or occasional condensation. Substance prohibitance date is 05/01/2012. ## Dimensions & Wiring Height 146 mm, width 70 mm, depth 188 mm. Control circuit ratings: at 24 V rated value 10 A, at 60 V 2 A, at 110 V 1 A, at 220 V 0.3 A, at 230 V 6 A, at 400 V 3 A. These are the contact ratings for the auxiliary or control contacts — match your PLC output or relay driver to the coil draw at your control voltage. Mechanical endurance is typical 10,000,000 operations. Electrical endurance varies by duty: at AC-1 maximum 900 operations/hour, AC-2 maximum 400, AC-3 maximum 1,000, AC-4 maximum 300. These are fast enough for most motor control circuits but may need coordination with upstream short-circuit protection devices for selectivity.","metaTitle":"Siemens 3RT1045-1AD04 SIRIUS Power Contactor, 45 kW AC-3","metaDescription":"Siemens SIRIUS 3RT1045-1AD04 power contactor, Size S3, 45 kW at 400 V AC-3, 37 kW AC-2, 66 A AC-4. Screw terminals, IP20 front. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"188 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":"42 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":"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=467787&mlfb=3RT1045-1AD04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AD04/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source — 3RT1036-1AB00?","answer":"The 3RT1036-1AB00 is a smaller Size S2 contactor from the same SIRIUS family, typically rated for lower motor currents. The 3RT1045-1AD04 (Size S3) is physically larger (146 x 70 x 188 mm vs the S2's smaller footprint) and carries higher AC-3 power ratings. It will not drop into a panel wired for the S2 without checking terminal spacing and current capacity — the S3 has larger main terminals for stranded up to 50 mm², so the panel wiring may need upgrading."},{"question":"What is the listed depth of the 3RT1045-1AD04?","answer":"The depth is 188 mm. This is the dimension from the mounting rail face to the furthest projection of the contactor body, not including any additional arc chamber or auxiliary contact blocks that may add depth."},{"question":"What solid wire sizes does the control circuit accept?","answer":"The control circuit terminals accept solid wire: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and max 2x (0.75... 4 mm²). For the main circuit, stranded wire up to 2x (10... 50 mm²) is accepted."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AD04","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/3RT1045-1AD04 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}}