{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2045-1NB34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2045-1NB34","canonicalUrl":"https://aoctrl.com/siemens/3RT2045-1NB34","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2045-1NB34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2045-1NB34, S3 frame, 20-33 VDC coil, screw-type terminals, 70 x 140 x 195 mm.","salesMarkdown":"It uses a 20-33 VDC coil with screw-type terminals and mounts via screw fixing or snap-on onto 35 mm DIN rail per DIN EN 60715, with mounting position flexibility of ±180° rotation and ±22.5° tilt on vertical surfaces. The AC-3 switching rate of 1 000 cycles per hour tells you this contactor is rated for frequent motor starting — typical for conveyor drives, pumps, and compressors in cyclic duty. AC-1 resistive switching at 900 cycles/h suits heater banks or lighting loads. Coil inrush peaks at 6.5 A, then holds at 3.5 VA at both 50 and 60 Hz. Auxiliary contacts are built in, rated at 6 A at 24 V, 2 A at 48 V and 60 V, and 1 A at 110 V — these cover control-circuit interlocking and status feedback without needing a separate auxiliary block. ## Panel integration — DIN rail, wiring, and clearances At 70 mm wide, 140 mm tall, and 195 mm deep, the S3 frame occupies a standard 4-module width on 35 mm DIN rail. Main circuit terminals accept stranded conductors from 6 to 70 mm², while solid or stranded control wiring from 2.5 to 16 mm² fits the coil terminals. For auxiliary circuits, two conductors per terminal are allowed: 2x (0.5-1.5 mm²) or 2x (0.75-2.5 mm²).","metaTitle":"Siemens 3RT2045-1NB34 SIRIUS Power Contactor, 20-33 VDC Coil","metaDescription":"Siemens SIRIUS 3RT2045-1NB34 power contactor, 20-33 VDC coil, S3 size, screw terminals. AC-3 switching up to 1000 cycles/h. Sourced to order. Request RFQ.","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":"38 ... 57 ms","at DC":"38 ... 57 ms","Height":"140 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"6 ... 70 mm²","at 50 Hz":"3.5 VA","at 60 Hz":"3.5 VA","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"10 mm","Rated Value":"20 ... 33 V","Initial Value":"0.8","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","Full-Scale Value":"1.1","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","Inrush Current Peak":"6.5 A","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":"20 ... 33 V","at 500 V rated value":"2 A","at 60 Hz rated value":"20 ... 33 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","Locked-Rotor Current Peak":"6.5 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"75 mA","Of Main Circuit Rated Value":"8 kV","Safety-Related Switching On":"No","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","Design Of The Surge Suppressor":"with varistor","Duration Of Inrush Current Peak":"50 µs","Locked-Rotor Current Mean Value":"3.2 A","Duration Of Locked-Rotor Current":"150 ms","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":"3.5 W","closing power of magnet coil at DC":"76 W","holding power of magnet coil at DC":"2.7 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/DC","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=629804&mlfb=3RT2045-1NB34","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2045-1NB34/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2045-1NB34 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the latest lead time and price."},{"question":"What is the closest functional second-source for 3RT2045-1NB34?","answer":"The closest functional peer is the 3RT1054-1AB36, which is a SIRIUS power contactor in the same S3 frame. The key difference is the coil voltage — the 3RT1054-1AB36 uses an AC coil, while the 3RT2045-1NB34 uses a 20-33 VDC coil. Panel footprint and terminal layouts are equivalent, so a drop-in replacement is possible if the control voltage matches."},{"question":"What is the depth of 3RT2045-1NB34?","answer":"The depth is 195 mm, with a width of 70 mm and height of 140 mm. Minimum clearances are 10 mm above and below, 20 mm forward, and 10 mm at the sides."},{"question":"What conductor sizes does 3RT2045-1NB34 accept?","answer":"Main circuit terminals accept stranded conductors from 6 to 70 mm². Coil terminals accept solid or stranded wire from 2.5 to 16 mm². Auxiliary terminals accept two conductors per position: 2x (0.5-1.5 mm²) or 2x (0.75-2.5 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2045-1NB34","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/3RT2045-1NB34 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}}