{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3BE40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3BE40","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3BE40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3BE40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1044-3BE40, 55 A AC-4 at 400 V, 37 kW at 500 V, screw-type terminals, snap-on mounting.","salesMarkdown":"For AC-2 duty (slip-ring motors or wound-rotor applications), it delivers 30 kW at 400 V. The AC-3 rating for standard squirrel-cage motors is 37 kW at 500 V and 18.6 kW at 690 V. Dimensions are 70 mm wide, 146 mm high, 152 mm deep — fits standard enclosure cutouts for the S3 frame. ## Terminals and wiring Main circuit connections are screw-type terminals. Accepts solid conductors 2x (0.25... 2.5 mm²) for control wiring and stranded conductors 2x (10... 50 mm²) for power cables. The box terminal design provides IP20 finger protection on the front with the cover installed; the terminal body itself is IP00, so maintain clearance in the enclosure. RoHS compliance substance prohibition date is 05/01/2012, covering the EU RoHS directive.","metaTitle":"Siemens SIRIUS 3RT1044-3BE40 Power Contactor, 55 A AC-4, 37","metaDescription":"Siemens SIRIUS 3RT1044-3BE40 power contactor, size S3. 55 A AC-4, 37 kW at 500 V, 30 kW at 400 V AC-2. Screw terminals, snap-on mounting. Active production. RFQ for lead time.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Solid":"2x (0.25 ... 2.5 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":"1 000 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":"37 kW","at 690 V rated value":"18.6 kW","Side-By-Side Mounting":"Yes","at 1000 V rated value":"30 W","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"30 kW","at AC-4 at 400 V rated value":"55 A","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"35 mm²","at 60 °C minimum permissible":"35 mm²","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"34 kW","at 690 V at 60 °C rated value":"102 kW","at 1000 V at 60 °C rated value":"66 W","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 125 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 (24 ... 14)","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 (0.25 ... 1.5 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":"600 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 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=421113&mlfb=3RT1044-3BE40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3BE40/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation is available for this contactor?","answer":"RoHS compliance is confirmed with a substance prohibition date of 05/01/2012. The product carries IP20 front protection and is rated for pollution degree 3."},{"question":"What is the closest functional peer to the 3RT1044-3BE40?","answer":"The 3RT1036-1AB00 is a smaller S0-frame contactor. It will not drop into the same panel without rewiring — the S3 frame has different dimensions (70 mm wide vs. 45 mm for S0) and higher current ratings. Use the 3RT1044-3BE40 when the load requires the 55 A AC-4 capability or the 37 kW at 500 V motor rating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3BE40","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/3RT1044-3BE40 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}}