{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-8BB40-0AB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-8BB40-0AB1","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-8BB40-0AB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-8BB40-0AB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 24 VDC coil, screw-type terminals, 152 mm depth, IP00/IP20 front.","salesMarkdown":"For DC switching, the contactor is rated 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — the current drops as voltage rises due to arc extinction limits in DC circuits. On AC motor duty, the contactor handles 37 kW at 500 V and 18.6 kW at 690 V. AC-2 duty (slip-ring motors, wound-rotor) is rated 30 kW at 400 V; AC-4 duty (plugging, inching) is rated 55 A at 400 V. These are the ratings that govern real motor switching — not the AC-1 resistive maximum. Enclosure rated IP00; IP20 on the front with cover or box terminal. The contactor body relies on the panel enclosure for dust protection. Screw-type terminals on the main current circuit accept 2x (0.25...2.5 mm²) solid or 2x (10...50 mm²) stranded. The control circuit terminals accept 2x (2.5...16 mm²) solid or stranded. Strip length and torque values follow standard Siemens practice for the S3 frame. The part carries the SIRIUS brand designation and is designed to IEC/EN 60947-4-1 standards for contactors and motor starters. ## Switching Performance These timing figures matter for coordination in sequential switching or safety circuits where contactor overlap must be minimized. Maximum mechanical operating frequency is 10,000,000 cycles typical. Electrical switching rates: 1,000 cycles/hour at AC-1 and AC-3, 400 cycles/hour at AC-2, and 300 cycles/hour at AC-4. The AC-4 limit is the binding constraint for applications with frequent plugging or inching.","metaTitle":"Siemens 3RT1044-8BB40-0AB1 SIRIUS Power Contactor, S3, 24 VD","metaDescription":"Siemens SIRIUS 3RT1044-8BB40-0AB1 power contactor, size S3, 24 VDC coil, 152 mm depth. Active production. Screw terminals. Quoted to order against RFQ.","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":"IP00; 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=117860&mlfb=3RT1044-8BB40-0AB1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-8BB40-0AB1/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT1044-8BB40-0AB1's listed depth?","answer":"The depth is 152 mm, with a width of 70 mm and height of 146 mm. This is the S3 frame size footprint."},{"question":"What compliance documentation does this brand provide for 3RT1044-8BB40-0AB1?","answer":"RoHS compliance is documented with a substance prohibition date of May 1, 2012. The contactor is designed to IEC/EN 60947-4-1 standards. UL/CSA listings are standard for the SIRIUS series but should be verified against the specific catalog number for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-8BB40-0AB1","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/3RT1044-8BB40-0AB1 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}}