{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3BB40","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1044-3BB40, 24 VDC coil, 10 A at 24 VDC, screw-type terminals, 70 x 146 x 152 mm (WxHxD).","salesMarkdown":"The Siemens 3RT1044-3BB40 is a SIRIUS S3 power contactor. It carries a 24 VDC coil rated at 10 A at 24 VDC. At 60 VDC the switching capacity drops to 2 A, and at 220 VDC it's 0.3 A, so this is a low-voltage DC coil, not a high-voltage DC power contactor. The AC-3 maximum operating rate is 1 000 cycles per hour, which covers most conveyor and pump cycles without thermal buildup. The S3 frame measures 70 mm wide by 146 mm high by 152 mm deep. Side-by-side mounting is allowed.","metaTitle":"Siemens 3RT1044-3BB40 SIRIUS Power Contactor, 24 VDC, 10 A","metaDescription":"Siemens 3RT1044-3BB40 SIRIUS S3 power contactor, 24 VDC coil, 10 A at 24 VDC. Rated for AC-3 motor switching. Current lifecycle stage. Screw terminals. Request a quote.","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":"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":"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=106130&mlfb=3RT1044-3BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3BB40/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT1044-3BB40's listed solid (2x (0.25... 2.5 mm²)) on this component line?","answer":"The solid conductor capacity for the main terminals is 2x (0.25... 2.5 mm²) — that's two solid wires per clamp, each between 0.25 and 2.5 mm² cross-section. For stranded conductors the range is 2x (10... 50 mm²), so you can land larger flexible cables with ferrules."},{"question":"Will 3RT1044-3BB40 drop into a panel that was specified around 3RT1044-1FB46 without rewiring?","answer":"The physical footprint (S3 frame, 70 x 146 x 152 mm) and DIN-rail mounting are identical, so the mechanical fit is the same. However, the coil voltage differs — the 3RT1044-1FB46 uses a different coil rating — so you must verify the control voltage matches. The main terminal sizes and screw-type connection are similar, but check the auxiliary contact configuration because the 1FB46 variant may have a different auxiliary block."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3BB40","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/3RT1044-3BB40 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}}