{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1BB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1BB44","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1BB44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1BB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1044-1BB44 power contactor, size S3, 24 VDC coil, screw-type terminals, IP20 front, 70 mm width, 146 mm height, 201 mm depth.","salesMarkdown":"Its 24 VDC coil pulls in at 0.8 of rated voltage and holds across the full operating range of -25 to +60 °C. The screw-type main terminals accept stranded conductors from 10 to 50 mm², sized for the 37 kW rating at 500 V and 18.6 kW at 690 V. Snap it onto 35 mm or 75 mm DIN rail — the 70 mm width and 146 mm height fit standard panel layouts, and side-by-side mounting is supported for multi-contactor assemblies. The 3RT1044-1BB44 carries AC-1 through AC-4 duty ratings that define its real switching capability. At AC-3 (standard motor start) it handles 37 kW at 500 V and at AC-2 (slip-ring motor start) 30 kW at 400 V. For heavy inching or plugging duty at AC-4, the maximum operational current is 55 A at 400 V. These are not continuous ratings — the contactor is designed for switching cycles, with a maximum of 1000 cycles per hour at AC-1 and AC-3, and 300 cycles per hour at AC-4. The auxiliary contacts on the front are rated for 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V, covering typical control circuit needs. Pollution degree 3 means it tolerates conductive dust in industrial environments, and the IP20 front with IP00 terminal area is standard for enclosed panel mounting. The main circuit terminals are screw-type, accepting 2x (10... 50 mm²) stranded or 2x (2.5... 16 mm²) solid/stranded. Solid auxiliary wire range: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²). Depth of 201 mm leaves clearance for wiring ducts and terminal blocks on the rail.","metaTitle":"Siemens 3RT1044-1BB44 SIRIUS Power Contactor, S3, 24 VDC","metaDescription":"Siemens SIRIUS 3RT1044-1BB44 power contactor, size S3, 24 VDC coil, screw terminals, IP20 front, 10 A at 24 V, 37 kW at 500 V. Current lifecycle stage, sourced to order. Request a","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"201 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":"24 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":"screw-type 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 (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":"600 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":"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":"$248.44","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=242343&mlfb=3RT1044-1BB44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1BB44/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1044-1BB44 and how do I get a price?","answer":"This part is sourced to order through independent distribution. Submit an RFQ — availability and current pricing are confirmed at quote time."},{"question":"Will 3RT1044-1BB44 drop into a panel specified around 3RT1044-1FB46 without rewiring?","answer":"The 3RT1044-1BB44 uses a 24 VDC coil; the 3RT1044-1FB46 uses a different coil voltage. Both are S3 size with screw terminals and the same mounting footprint, but the coil supply must match. If the panel is wired for 24 VDC, the 1BB44 is a direct mechanical swap."},{"question":"What compliance documentation does this brand provide for 3RT1044-1BB44?","answer":"The part carries a substance prohibitance date of 05/01/2012, indicating RoHS and REACH compliance documentation is available from Siemens. Standard certifications for the SIRIUS range include IEC and UL listings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1BB44","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/3RT1044-1BB44 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}}