{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT5045-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT5045-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT5045-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT5045-1BW40, 48 V DC coil, screw-type terminals, 114 kW at 690 V at 60 °C, snap-on DIN rail mounting.","salesMarkdown":"The 3RT5045-1BW40: Rated for 114 kW at 690 V at 60 °C ambient, this contactor handles heavy motor loads in conveyor, pump, and fan applications. The S3 frame size and screw-type main terminals accept up to 2x 16 mm² solid/stranded or 2x 1/0 AWG, matching typical panel wiring for 50–100 A motor circuits. The 48 V DC coil draws 15 W closing and holding, so the control transformer or DC supply must be sized for that continuous draw. At 24 V DC the coil draws 6 A inrush; verify your PLC output or relay can handle that peak. Snap-on mounting onto 35 mm or 75 mm standard DIN rail, plus screw fixing for vibration-prone environments. Width is 70 mm, depth 152 mm, height 146 mm — the S3 footprint. ## Coordination and compliance This matters for selectivity studies — the contactor clears faults without damage up to that fuse rating, so it coordinates with standard motor branch circuits. Insulation voltage rated 1000 V gives headroom for 690 V systems. RoHS compliance date is March 1, 2017 — the part meets EU substance restrictions. Auxiliary switch extension is supported via the SIRIUS add-on system, so you can add feedback contacts without changing the base contactor. ## Switching performance Electrical life varies by duty: AC-1 (resistive) at 900 cycles/hour, AC-3 (motor start/run) at 1000 cycles/hour, AC-4 (plugging/inching) at 300 cycles/hour. At 690 V the contactor switches 21.1 kW motor load; at 400 V 66 kW; at 230 V 38 kW — all at 60 °C ambient. These are the real-world ratings for sizing, not just the maximum voltage number.","metaTitle":"Siemens 3RT5045-1BW40 SIRIUS S3 Power Contactor, 48 V DC Coi","metaDescription":"Siemens 3RT5045-1BW40 SIRIUS S3 power contactor, 48 V DC coil, rated 114 kW at 690 V at 60 °C. Active production. Screw terminals, snap-on DIN rail. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Width":"70 mm","at DC":"1 000 1/h","Height":"146 mm","Rated Value":"48 V","During Storage":"-55 ... +80 °C","at AC-1 maximum":"900 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","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 (2.5 ... 16 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Power contactor","at 24 V rated value":"6 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 690 V rated value":"21.1 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"03/01/2017","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 400 V at 60 °C rated value":"66 kW","at 690 V at 60 °C rated value":"114 kW","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","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","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)","at ambient temperature 40 °C rated value":"120 A","at ambient temperature 60 °C rated value":"100 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²)","Type Of Voltage Of The Control Supply Voltage":"DC","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5e33e1d6801b803f990194ebeee3e77d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=580040&mlfb=3RT5045-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1BW40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RT5045-1BW40?","answer":"The 3RT5045-1AC20 uses an AC coil instead of the 48 V DC coil on the -1BW40. The 3RT5045-1AF00 uses a different control voltage. The 3RT5046-1BM40 is a larger S3 frame variant. For a DC coil replacement at the same frame size, the -1BW40 is the direct choice — swapping to an AC coil version would require control circuit rewiring."},{"question":"Where can I buy 3RT5045-1BW40 and how is it quoted?","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 your volume and delivery requirements."},{"question":"Will 3RT5045-1BW40 drop into a panel specified for 3RT5045-1AC20?","answer":"The physical dimensions and mounting are identical — both are S3 frame with the same 70 mm width, 152 mm depth, and DIN rail snap-on. The difference is the coil: the -1BW40 requires 48 V DC, while the -1AC20 uses an AC coil. If the control circuit supplies 48 V DC, it drops in without rewiring."},{"question":"What compliance documentation does Siemens provide for 3RT5045-1BW40?","answer":"The part is RoHS compliant with a substance prohibition date of March 1, 2017. Pollution degree 3 and insulation voltage 1000 V indicate IEC 60947 compliance. Standard Siemens documentation includes the datasheet, CE declaration, and REACH information upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT5045-1BW40","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/3RT5045-1BW40 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}}