{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1BF40","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1045-1BF40, size S3, 110 V AC coil, screw-type terminals, IP20 front, 70 mm width, 146 mm height, 152 mm depth.","salesMarkdown":"## SIRIUS S3 Power Contactor, 110 V Coil Rated for AC-3 switching at 500 V delivering 45 kW, and at 690 V delivering 21.1 kW, this contactor handles motor loads typical of pumps, fans, and compressors in industrial control panels. Mechanical life is rated at 10 million operations typical, with maximum switching rates of 1000 cycles per hour in AC-3 duty, 900 in AC-1, 400 in AC-2, and 300 in AC-4. Main circuit terminals accept solid conductors from 2x (0.5 to 1.5 mm²) up to 2x (0.75 to 4 mm²) and stranded conductors from 2x (10 to 50 mm²); auxiliary terminals accept 2x (2.5 to 16 mm²) solid or stranded. The terminal block itself carries an IP00 rating, so the overall IP20 protection on the front relies on the cover or box terminal being fitted — plan for panel-side sealing if the contactor is mounted in a washdown or dusty environment. Pollution degree 3 classification means it is suited for industrial atmospheres with conductive pollution. Lifecycle status is current production. RoHS compliance date is 05/01/2012, covering substance prohibitions under EU Directive 2011/65/EU. DC switching times are 14 to 20 ms. These figures matter when coordinating with upstream protection devices or when the contactor is used in a safety circuit requiring fast dropout.","metaTitle":"Siemens 3RT1045-1BF40 SIRIUS Power Contactor, 110 V Coil, Si","metaDescription":"Siemens 3RT1045-1BF40 SIRIUS power contactor, 110 V AC coil, size S3, screw terminals, IP20 front, 10 million mechanical cycles. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"70 mm","at DC":"14 ... 20 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","Arcing Time":"10 ... 15 ms","Rated Value":"110 V","On The Front":"IP20; IP20 on the front with cover / box terminal","Initial Value":"0.8","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","Full-Scale Value":"1.1","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 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","closing power of magnet coil at DC":"15 W","holding power of magnet coil at DC":"15 W","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)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","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=117611&mlfb=3RT1045-1BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1BF40/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT1045-1BF40's listed depth?","answer":"The depth is 152 mm, with a width of 70 mm and height of 146 mm, making it a size S3 footprint that fits standard DIN-rail enclosures."},{"question":"What solid wire sizes does 3RT1045-1BF40 accept?","answer":"The main terminals accept solid conductors in ranges of 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and a maximum of 2x (0.75 to 4 mm²). Stranded conductors up to 2x (10 to 50 mm²) are also supported."},{"question":"What compliance documentation does Siemens provide for 3RT1045-1BF40?","answer":"The contactor is RoHS compliant with a substance prohibition date of 05/01/2012. The SIRIUS series typically carries UL, CSA, and CE certifications; specific approval markings should be verified against the nameplate on the unit."},{"question":"Where can I buy 3RT1045-1BF40?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1BF40","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/3RT1045-1BF40 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}}