{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3BW44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3BW44","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3BW44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3BW44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1044-3BW44, screw-type terminals, 55 A AC-4 at 400 V, 30 kW AC-2/3 at 400 V, DIN-rail mount, IP20 front.","salesMarkdown":"It's rated for motor switching at 30 kW in AC-2 and AC-3 duty at 400 V, and handles 55 A in AC-4 duty at 400 V — the heavy jogging and inching category that wears contacts fastest. This is a fast-moving SIRIUS size that MRO storerooms typically keep as a critical spare for 400 V motor circuits up to 30 kW. ## Ratings & Fit The AC-3 rating at 400 V is 30 kW — that's the standard duty for squirrel-cage motors starting and running. Coil circuit operates at 48 V rated value, with a pickup voltage of 0.8 x rated (38.4 V) and a dropout of 1.1 x rated (52.8 V) — standard for control transformers in 48 VDC panels. Terminal capacity: solid conductors accept 2x (0.25 to 2.5 mm²), stranded accept 2x (10 to 50 mm²) for the main circuit, and 2x (2.5 to 16 mm²) for auxiliary circuits. The 201 mm depth, 70 mm width, and 146 mm height fit the S3 frame footprint — verify panel layout if replacing a different manufacturer's size.","metaTitle":"Siemens 3RT1044-3BW44 SIRIUS Power Contactor, S3, 55 A AC-4,","metaDescription":"Siemens SIRIUS 3RT1044-3BW44 power contactor, size S3. 55 A AC-4 at 400 V, 30 kW AC-2/3. Screw terminals, DIN-rail mount. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"201 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":"48 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":"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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=483132&mlfb=3RT1044-3BW44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3BW44/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RT1044-3BW44?","answer":"Submit an RFQ through this listing. Pricing and stock levels are confirmed at quote time — this is a standard-production part sourced through Siemens distribution, so lead times are typically aligned with normal factory cycles."},{"question":"What is 3RT1044-3BW44's listed depth (201 mm) on this component line?","answer":"The depth is 201 mm, with a width of 70 mm and height of 146 mm. These are the S3 frame dimensions for panel layout and enclosure sizing."},{"question":"What compliance documentation does this brand provide for 3RT1044-3BW44 (RoHS, REACH, UL, IEC)?","answer":"The part carries a substance prohibition date of 05/01/2012, indicating RoHS compliance per EU Directive 2011/65/EU. Standard Siemens documentation includes CE declaration of conformity and UL/CSA file numbers available on request."},{"question":"When sourcing 3RT1044-3BW44, what's the closest functional second-source — 3RT1044-1FB46?","answer":"The 3RT1044-1FB46 is a peer in the same SIRIUS S3 frame, but it uses spring-cage terminals instead of screw-type. The 3RT1044-3BW44 uses screw-type terminals on the main current circuit. Both share the same coil voltage and motor power ratings, so a panel originally wired for screw terminals would need a terminal adapter or re-termination to accept the spring-cage variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3BW44","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/3RT1044-3BW44 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}}