{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3AD00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3AD00","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3AD00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AD00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1044-3AD00, 42 V 50 Hz coil, 37 kW AC-3 at 400 V, screw-type terminals, snap-on DIN rail.","salesMarkdown":"The coil is rated at 42 V at 50 Hz, with an operating range of 0.8 to 1.1 times the rated voltage at 50 Hz. This is a specific voltage variant — not the common 24 V or 230 V — so verify your control voltage matches before specifying. For motor duty, the contactor is rated 37 kW at 400 V in AC-3 category (squirrel-cage motors, starting and disconnecting running), and 30 kW at 400 V in AC-2 (slip-ring motors, starting and switching off). In AC-4 duty (inching, plugging, reversing) it handles 55 A at 400 V — the most demanding thermal cycle, so that figure governs applications with frequent jogging. The contactor occupies 70 mm width, 146 mm height, and 139 mm depth — a compact S3 footprint. Side-by-side mounting is permitted, which saves rail space in dense panels. The main current circuit uses screw-type terminals; solid wire accepts 2x (0.25 to 2.5 mm²), stranded accepts 2x (10 to 50 mm²), and a mixed solid-or-stranded range of 2x (2.5 to 16 mm²) covers most panel wiring. Pollution degree 3 (conductive pollution) means it is suited for industrial environments where occasional condensation or light contamination occurs. Mechanical endurance is rated at 10,000,000 operating cycles typical, with switching rates up to 1,000 cycles per hour for AC-1 and AC-3, 400/h for AC-2, and 300/h for AC-4. The part carries a RoHS substance prohibition date of 05/01/2012, confirming compliance with the EU RoHS directive for the materials in the bill of materials.","metaTitle":"Siemens 3RT1044-3AD00 SIRIUS S3 Power Contactor, 42 V 50 Hz","metaDescription":"Siemens SIRIUS 3RT1044-3AD00 power contactor, size S3, 42 V 50 Hz coil, rated 37 kW at 400 V AC-3. Screw terminals, snap-on DIN rail. Active production. RFQ for lead time.","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 ... 1.1","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 ... +60 °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":"42 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=252986&mlfb=3RT1044-3AD00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AD00/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"The coil is 42 V at 50 Hz. Motor ratings: 37 kW at 400 V AC-3, 30 kW at 400 V AC-2, and 55 A at 400 V AC-4. Mechanical endurance is 10,000,000 cycles typical."},{"question":"What is the physical size and mounting of this contactor?","answer":"It is a SIRIUS S3 frame: 70 mm wide, 146 mm high, 139 mm deep. Mounts via screw or snap-on onto 35 mm or 75 mm DIN rail. Side-by-side mounting is allowed."},{"question":"What compliance documentation does this part have?","answer":"The part is RoHS compliant with a substance prohibition date of 05/01/2012. It is designed for pollution degree 3 environments and carries IP20 on the front face with cover."},{"question":"Will this contactor work with 24 V or 230 V control circuits?","answer":"No — the coil is specifically rated at 42 V at 50 Hz with an operating range of 0.8 to 1.1 times that voltage. It will not pull in reliably on 24 V or 230 V. A different coil variant is needed for those voltages."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3AD00","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/3RT1044-3AD00 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}}