{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1BE40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1BE40","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1BE40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1BE40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, order code 3RT1045-1BE40, screw-type terminals, 37 kW AC-2 at 400 V, current production.","salesMarkdown":"The headline motor-switching rating is 37 kW at 400 V under AC-2 duty — this is the category for slip-ring motors, so the contactor is sized for starting and stopping those loads at that power level. For AC-4 duty (plugging, inching, reversing), the rated operational current is 66 A at 400 V, which governs the thermal stress during frequent reversals. That covers the range from control wiring to motor power tails without needing adapters. Front protection is IP20 with the cover or box terminal fitted; the terminal itself is IP00. RoHS compliance is documented with a substance prohibition date of May 1, 2012, covering the EU directive scope. No other compliance flags (UL, CSA, CE) are explicitly listed in the spec record, but the SIRIUS series typically carries those marks — verify against your local panel certification requirements. Dimensions are 146 mm high, 70 mm wide, 152 mm deep — the S3 frame fits a standard 70 mm wide DIN-rail footprint. Mechanical life is typical 10 million operations; the switching frequency varies by duty: up to 1,000 cycles/hour under AC-3, 900 under AC-1, 400 under AC-2, and 300 under AC-4.","metaTitle":"Siemens 3RT1045-1BE40 SIRIUS Power Contactor, S3, 37 kW AC-2","metaDescription":"Siemens SIRIUS 3RT1045-1BE40 power contactor, size S3, screw terminals, 37 kW AC-2 at 400 V, current production. DIN-rail snap-on. RFQ for pricing.","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":"60 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=204483&mlfb=3RT1045-1BE40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1BE40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — does the 3RT1044-1FB46 drop in?","answer":"The 3RT1044-1FB46 is a peer in the same SIRIUS S3 frame, but it uses a different coil voltage and terminal configuration. The 3RT1045-1BE40 has a 24 V DC coil and screw terminals; the 3RT1044-1FB46 is a different variant. They share the same mounting footprint and basic S3 frame, so panel cutouts and DIN-rail spacing are identical, but verify the coil voltage and auxiliary contact arrangement before substituting."},{"question":"What are the main circuit terminal wire ranges?","answer":"Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (10 to 50 mm²). The terminals are screw-type."},{"question":"What compliance documentation is available for this contactor?","answer":"RoHS compliance is confirmed with a substance prohibition date of May 1, 2012. The spec record does not list UL, CSA, or CE marks explicitly, though the SIRIUS series typically carries them — check the manufacturer's declaration for your specific certification need."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1BE40","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/3RT1045-1BE40 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}}