{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2045-1AL24","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2045-1AL24","canonicalUrl":"https://aoctrl.com/siemens/3RT2045-1AL24","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2045-1AL24","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 24 VDC coil, screw-type terminals, DIN rail snap-on mounting, 70 x 140 x 195 mm (W x H x D).","salesMarkdown":"The envelope is 70 mm wide, 140 mm high, and 195 mm deep — the depth matters when spacing components in a shallow enclosure; the listed 195 mm is the body depth, not including coil terminals. Main power circuit wiring accepts solid conductors from 2.5 to 16 mm² and stranded conductors from 6 to 70 mm². Auxiliary and coil terminals accept two conductors per clamp: 2x 0.5–1.5 mm² solid or stranded, or 2x 0.75–2.5 mm². That range covers most panel-building practice without needing adapter lugs. ## Switching duty and thermal limits This contactor is rated for different switching frequencies depending on the utilization category. In AC-3 duty (squirrel-cage motor starting, switching off running motors) it manages up to 1,000 operating cycles per hour. AC-4 (plugging, inching) drops to 300 cycles/h. AC-1 (resistive loads) is 900 cycles/h, and AC-2 (slip-ring motors) is 400 cycles/h. The AC-3e rating also shows 1,000 cycles/h. These numbers define the thermal cycling the contactor can sustain — exceeding them shortens contact life. Power dissipation at 50 Hz is 0.35 W and at 60 Hz is 0.41 W — negligible for panel heat calculations but useful when sizing a control transformer for the coil circuit. Operating time (closing) is 10–21 ms; arcing time is 10–20 ms. Side clearance is 10 mm; upward and downward clearance is also 10 mm; forward clearance is 20 mm. The built-in auxiliary switch is rated by voltage for DC switching: 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 0.8 A at 440 V. At 230 V AC the rating is 15 hp. At 400 V AC it is 3 A. These are the make/break capacities for the auxiliary contacts — useful when interlocking or signaling a PLC input. The lifecycle stage for 3RT2045-1AL24 is current production. This is not a phase-out or NRND line.","metaTitle":"Siemens 3RT2045-1AL24 SIRIUS Power Contactor, S3 Frame, 24 V","metaDescription":"Siemens 3RT2045-1AL24 SIRIUS S3 power contactor, 24 VDC coil, screw terminals. DIN rail mount. Rated for AC-3 switching up to 1000 cycles/h. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"195 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":"Screw-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 standard mounting 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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"6 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":"230 V","at 500 V rated value":"2 A","at 60 Hz rated value":"230 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","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2)","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":"screw-type 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":"Screw-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)","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"5.3 W","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)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","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":"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":"https://cdn.aoctrl.com/7d28fa7380658c541019ac8751bc4da6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629776&mlfb=3RT2045-1AL24","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2045-1AL24/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2045-1AL24 and what is the lead time?","answer":"This part is sourced and quoted to order through our independent distribution channel. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead-time commitment."},{"question":"What wire sizes does 3RT2045-1AL24 accept on the main power circuit?","answer":"Solid conductors from 2.5 to 16 mm² and stranded conductors from 6 to 70 mm². Auxiliary terminals accept 2x 0.5–1.5 mm² or 2x 0.75–2.5 mm²."},{"question":"Will 3RT2045-1AL24 drop into a panel specified around 3RT1054-1AB36 without rewiring?","answer":"Both are SIRIUS S3-frame contactors sharing the same DIN-rail footprint and terminal layout, so mechanical fit is the same. Verify the coil voltage — 3RT2045-1AL24 is 24 VDC — and the auxiliary contact configuration matches your control scheme before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2045-1AL24","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/3RT2045-1AL24 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}}