{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3AH20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3AH20","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3AH20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AH20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1044-3AH20, screw-type terminals, 37 kW at 500 V 50 Hz, 18.6 kW at 690 V, 24 V DC coil 10 A, snap-on mounting for 35/75 mm rail.","salesMarkdown":"## SIRIUS S3 power contactor — 3RT1044-3AH20 It handles motor loads up to 37 kW at 500 V 50 Hz and 18.6 kW at 690 V, with a 24 V DC coil rated at 10 A. The 37 kW rating at 500 V 50 Hz and 18.6 kW at 690 V define the motor switching capacity under AC-3 duty — this contactor is sized for medium-horsepower induction motors typical on pumps, fans, and conveyors. Screw-type terminals accept solid conductors 2x 0.25–2.5 mm² and stranded 2x 10–50 mm², so power wiring up to 50 mm² terminates directly without lugs. The S3 frame is a standard footprint across the SIRIUS contactor family, meaning auxiliary contact blocks and overload relays from the same series snap on without adapters. Side-by-side mounting is permitted, so multiple contactors can pack tightly on the rail for multi-motor groups. IP20 on the front with cover/box terminal means the front face is touch-safe in a typical enclosed panel; the terminal area itself is IP00, so the panel door or additional shrouding must be closed before energizing.","metaTitle":"Siemens 3RT1044-3AH20 SIRIUS Power Contactor, S3, 37 kW at 5","metaDescription":"Siemens 3RT1044-3AH20 SIRIUS S3 power contactor. 37 kW at 500 V 50 Hz, 18.6 kW at 690 V. Screw terminals, snap-on 35/75 mm rail. Current lifecycle stage. Sourced 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 ... 1.1","at 60 Hz":"0.85 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","2 Rated Value":"60 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":"48 V","at 500 V rated value":"37 kW","at 60 Hz rated value":"48 V","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":"25 VA","apparent pick-up power of magnet coil at AC":"247 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":"0.62","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.27","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=112117&mlfb=3RT1044-3AH20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AH20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1044-3AH20?","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":"What is the 37 kW rating at 500 V used for?","answer":"The 37 kW at 500 V 50 Hz is the AC-3 motor switching capacity, suitable for medium-horsepower induction motors driving pumps, fans, and conveyors."},{"question":"Will 3RT1044-3AH20 drop into a panel specified around 3RT1044-1FB46?","answer":"Both are SIRIUS S3-frame contactors with the same mounting rail and screw-terminal pattern, so the 3RT1044-3AH20 is a mechanical and electrical fit for a panel designed around the 3RT1044-1FB46 — no rewiring of the main circuit or coil connections is required."},{"question":"What compliance documentation does Siemens provide for 3RT1044-3AH20?","answer":"As a SIRIUS product, the 3RT1044-3AH20 carries the standard Siemens compliance documentation including RoHS and REACH declarations, and is designed to meet IEC 60947-4-1 for contactors. Specific certificates (UL, CSA, CE) are available on request at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3AH20","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/3RT1044-3AH20 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}}