{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2045-1AC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2045-1AC10","canonicalUrl":"https://aoctrl.com/siemens/3RT2045-1AC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2045-1AC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2045-1AC10, 77 A at 480 V AC-3, screw-type terminals, 35 mm DIN rail mount.","salesMarkdown":"## Siemens 3RT2045-1AC10 SIRIUS Power Contactor — 77 A at 480 V The Siemens 3RT2045-1AC10 is a SIRIUS S3-frame power contactor rated for 77 A at 480 V in AC-3 duty — that's the motor-switching current, not the resistive load. The coil terminals are screw-type, and the main power circuit accepts solid conductors from 2.5 to 16 mm² or stranded from 6 to 70 mm² — that's a wide enough range to land a #4 AWG or a 2 AWG without adapters. The S3 frame is 70 mm wide and 140 mm tall, with a depth of 152 mm — check your enclosure depth before committing. Arcing time runs 10 to 20 ms at AC — that's the interval from contact separation to arc extinction. The contactor is rated for 1 000 operations per hour at AC-3 and AC-3e maximum, 900 at AC-1, 400 at AC-2, and 300 at AC-4. If your application cycles faster than that, you'll need to derate or step up to a larger frame. Mechanical life is typical 10 000 000 operations — that's the contactor body, not the contacts; electrical life depends on the switching current and load type. ## Auxiliary Contacts and Control Circuit Comes with an auxiliary switch block — the main contacts have a 10 to 2 configuration (10 NO, 2 NC). The auxiliary contact ratings at 24 VDC: 10 A; at 48 VDC: 2 A; at 60 VDC: 2 A; at 110 VDC: 1 A; at 125 VDC: 0.9 A; at 220 VDC: 0.3 A; at 400 VDC: 3 A; at 440 VDC: 0.8 A. These are the DC breaking limits — inductive loads will need a suppression diode across the coil to avoid contact welding. The contactor is part of the SIRIUS family, which carries CE, UL, CSA, and IEC certifications as standard for the series. Specific compliance documentation (RoHS, REACH) is available on request with the RFQ.","metaTitle":"Siemens 3RT2045-1AC10 SIRIUS Power Contactor, 77 A at 480 V","metaDescription":"Siemens 3RT2045-1AC10 SIRIUS power contactor, rated 77 A at 480 V AC-3. Screw terminals, 35 mm DIN rail mount. Current lifecycle stage. Sourced to order against 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 60 Hz":"0.4","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 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 ... 1.5 mm²), 2x (0.75 ... 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 500 V rated value":"2 A","at 60 Hz rated value":"24 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":"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":"21 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":"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=629758&mlfb=3RT2045-1AC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2045-1AC10/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RT2045-1AC10's depth?","answer":"The depth is 152 mm — check your enclosure depth before mounting, especially if you're retrofitting into an existing panel."},{"question":"What compliance documentation does Siemens provide for 3RT2045-1AC10?","answer":"The SIRIUS series carries CE, UL, CSA, and IEC certifications. RoHS and REACH declarations are available on request with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2045-1AC10","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/3RT2045-1AC10 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}}