{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2045-3AN20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2045-3AN20","canonicalUrl":"https://aoctrl.com/siemens/3RT2045-3AN20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2045-3AN20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Power contactor, 3RT2045-3AN20, size S3, spring-type coil terminals, screw and snap-on mounting onto 35 mm DIN rail, 152 mm depth, 70 mm width, 140 mm height.","salesMarkdown":"The contactor occupies a 70 mm width, 140 mm height, and 152 mm depth on the rail. The contactor handles switching frequencies up to 1000 cycles per hour under AC-3 and AC-3e maximum duty, 900/h under AC-1, 400/h under AC-2, and 300/h under AC-4. ## Wiring and Clearance The main circuit accepts solid conductors from 2.5 to 16 mm² and stranded conductors from 6 to 70 mm². The auxiliary circuit takes 2x (0.5 to 2.5 mm²) solid or stranded. Coil connection uses spring-type terminals — no screw torque to verify, but ensure the wire is fully seated before closing the clamp. These are the bare-metal spacing requirements; factor in any additional creepage if the panel environment is humid or conductive. Coil power draw at 50 Hz is 0.35 VA; at 60 Hz it is 0.41 VA. The arcing time for the main contacts spans 10 to 21 ms, with a stated arcing time of 10 to 20 ms. This is within the typical window for AC contactors but should be verified against the upstream protection coordination if the circuit is fast-acting. This covers most indoor industrial panels and unheated warehouses. The built-in auxiliary switch is rated for switching at various control voltages: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.8 A at 440 V. At 230 V the rating is 15 hp, which is a motor-starting capacity, not a resistive load figure.","metaTitle":"Siemens 3RT2045-3AN20 SIRIUS Power Contactor, S3 Size, Sprin","metaDescription":"Siemens SIRIUS 3RT2045-3AN20 power contactor, size S3, spring-type coil terminals, screw and snap-on 35mm DIN rail mount. Current lifecycle stage. Source to order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Solid":"2.5 ... 16 mm²","Width":"70 mm","at AC":"10 ... 21 ms","Height":"140 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"6 ... 70 mm²","at 50 Hz":"0.35","at 60 Hz":"0.41","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"10 mm","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","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","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","at AC-3e maximum":"1 000 1/h","For Main Contacts":"10 ... 2","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S3","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"15 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.8 A","at 480 V rated value":"77 A","at 50 Hz rated value":"220 V","at 500 V rated value":"2 A","at 60 Hz rated value":"220 V","at 600 V rated value":"62 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","at 1000 V rated value":"37 kW","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"7.5 hp","at 200/208 V rated value":"25 hp","at 220/230 V rated value":"30 hp","at 460/480 V rated value":"60 hp","at 575/600 V rated value":"60 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"8 kV","Safety-Related Switching On":"Yes","at AC-3 rated value maximum":"1 000 V","at AC in hot operating state":"15.9 W","at AC-2 at 400 V rated value":"37 kW","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"66 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"03/01/2017","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"110 A","at AC-5b up to 400 V rated value":"80 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 160A (690V,100kA), aM: 80A (690V,100kA), BS88: 125A (415V,80kA)","Without Load Current Share Typical":"25 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"5.3 W","for AWG cables for auxiliary contacts":"2x (20 ... 16)","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)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC","Limited To 1 S Switching At Zero Current Maximum":"1 500 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"1 186 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"851 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"538 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"423 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"1 000 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"gG: 10 A (500 V, 1 kA)","minimum cross-section in main circuit at maximum AC-1 rated value":"50 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","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":"https://cdn.aoctrl.com/7d28fa7380658c541019ac8751bc4da6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629825&mlfb=3RT2045-3AN20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2045-3AN20/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the 3RT2045-3AN20?","answer":"The depth is 152 mm. Combined with a width of 70 mm and height of 140 mm, it fits the standard S3 footprint on a 35 mm DIN rail."},{"question":"What conductor sizes does the 3RT2045-3AN20 accept?","answer":"Main circuit accepts solid 2.5 to 16 mm² and stranded 6 to 70 mm². Auxiliary circuit accepts 2x (0.5 to 2.5 mm²) solid or stranded. Coil terminals are spring-type."},{"question":"Where can I buy the 3RT2045-3AN20?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What are the switching frequency limits for the 3RT2045-3AN20?","answer":"AC-3 and AC-3e maximum: 1000 cycles/hour. AC-1 maximum: 900/h. AC-2 maximum: 400/h. AC-4 maximum: 300/h. These ratings govern how often the contactor can cycle under load without exceeding thermal limits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2045-3AN20","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/3RT2045-3AN20 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}}