{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3AX00-0AA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3AX00-0AA3","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3AX00-0AA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AX00-0AA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, order code 3RT1044-3AX00-0AA3, screw-type terminals, 55 A AC-4 at 400 V, 37 kW at 500 V, IP20 front.","salesMarkdown":"The IP20 rating on the front with cover or box terminal means the live parts are finger-safe once the panel door is closed — standard for enclosed industrial gear. The terminal area itself is IP00, so keep the panel locked during operation. That is the heavy-use rating; at 55 A it handles frequent reversals on a motor up to roughly 30 kW at 400 V without welding the main contacts. For standard across-the-line starting (AC-3), the contactor is sized for 37 kW at 500 V and 18.6 kW at 690 V. The 500 V figure covers most 480 V North American installations with headroom; the 690 V rating suits 600 V Canadian or 690 V European industrial networks. AC-2 duty (slip-ring motor starting) is rated at 30 kW at 400 V — a lower switching frequency than AC-3 because the rotor circuit sees higher making current. ## Terminal wiring and panel integration Main power terminals are screw-type, accepting 2x (10... 50 mm²) stranded or 2x (2.5... 16 mm²) solid/stranded. The control circuit (coil) terminals take 2x (0.25... 2.5 mm²) solid. Strip lengths and torque values follow standard Siemens practice for S3 frame — no special tooling needed. Dimensions are 146 mm high, 70 mm wide, 139 mm deep. The 70 mm width matches the S3 footprint; side-by-side mounting is permitted without derating for AC-3 duty, though AC-4 cycling may need a 10 mm gap depending on ambient. Check the thermal derating curve above 40 °C. ## Lifecycle and compliance posture RoHS compliance date is 05/01/2012, meaning it meets the EU RoHS directive for substances of concern. The pollution degree rating of 3 suits industrial environments with conductive pollution (condensation, light dust).","metaTitle":"Siemens 3RT1044-3AX00-0AA3 SIRIUS Power Contactor, S3, 55A A","metaDescription":"Siemens 3RT1044-3AX00-0AA3 SIRIUS power contactor, size S3. Rated 55A AC-4 at 400V, 37kW at 500V. Screw terminals, IP20 front. Current production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"70 mm","at AC":"10 ... 19 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","at 50 Hz":"0.8 ... 0.98","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","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 ... +40 °C","Fastening Method":"screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail","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 50 Hz rated value":"27 V","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","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)","apparent holding power of magnet coil at AC":"21 VA","apparent pick-up power of magnet coil at AC":"218 VA","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.61","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.26","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=283248&mlfb=3RT1044-3AX00-0AA3","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AX00-0AA3/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1044-3AX00-0AA3?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will 3RT1044-3AX00-0AA3 drop into a panel specified around 3RT1044-1FB46 without rewiring?","answer":"Both are SIRIUS S3 frame contactors with the same mounting footprint and screw-type main terminals, so the mechanical fit is identical. The difference is in the coil voltage and auxiliary contact configuration — verify the coil rating and aux block count before swapping."},{"question":"What compliance documentation does this contactor carry?","answer":"RoHS compliance is dated 05/01/2012. The pollution degree rating of 3 indicates suitability for industrial environments. Siemens SIRIUS contactors typically carry UL, CSA, and CE certifications; confirm the specific approvals for this variant at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3AX00-0AA3","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/3RT1044-3AX00-0AA3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-14T23:40:48.276Z","lastPublished":"2026-09-14T23:40:48.276Z","indexable":true}}