{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1AL20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1AL20","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1AL20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AL20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, 3RT1044-1AL20, S3 frame, 37 kW at 500 V AC-3, screw terminals, snap-on DIN rail.","salesMarkdown":"It is rated 37 kW at 500 V for AC-3 duty, which is the standard category for squirrel-cage motors — so this contactor handles motor starting and running currents up to that power level without welding the main contacts during inrush. The S3 frame footprint (146 mm height, 70 mm width) fits standard DIN-rail enclosures; its 139 mm depth clears most gland plates and back-panel wiring channels. Solid wire accepts 2x (0.5…1.5 mm²), 2x (0.75…2.5 mm²), or max 2x (0.75…4 mm²); stranded accepts 2x (10…50 mm²). The range covers both control-circuit pilot wiring and power-circuit cable up to 50 mm² — common for a 37 kW motor feed. The terminal enclosure is IP00 (open), but the front with cover or box terminal achieves IP20, which is finger-safe for panel-side access.","metaTitle":"Siemens 3RT1044-1AL20 SIRIUS Power Contactor, S3, 37 kW at 5","metaDescription":"Siemens SIRIUS 3RT1044-1AL20 power contactor, S3 frame, 37 kW at 500 V AC-3, screw terminals, snap-on DIN 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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 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":"230 V","at 500 V rated value":"37 kW","at 60 Hz rated value":"230 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":"screw-type 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 (20 ... 16), 2x (18 ... 14), 1x 12","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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 (10 ... 35 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=347349&mlfb=3RT1044-1AL20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AL20/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"It is a Size S3 power contactor rated 37 kW at 500 V AC-3 for motor loads. The coil operates at 50/60 Hz with a tolerance band of 0.8…1.1 at 50 Hz and 0.85…1.1 at 60 Hz. Mechanical life is 10 million operations typical."},{"question":"Will the 3RT1044-1AL20 drop into a panel specified for the 3RT1044-1FB46?","answer":"Both are S3-frame SIRIUS contactors with the same mounting footprint (146 x 70 x 139 mm) and screw terminals, so the mechanical fit and wiring are identical. The difference is in the coil voltage and auxiliary contact configuration — verify those against your control circuit before swapping."},{"question":"What compliance documentation is available for this part?","answer":"The product carries IP20 front protection and is designed for pollution degree 3 environments. Specific RoHS, REACH, UL, or IEC declarations are not listed in this record but are typically available from Siemens upon request for the SIRIUS series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1AL20","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/3RT1044-1AL20 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}}