{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1AN20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1AN20","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1AN20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AN20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, order code 3RT1044-1AN20, 37 kW at 500 V AC-3, screw-type terminals, snap-on mounting.","salesMarkdown":"## SIRIUS S3 power contactor — 37 kW at 500 V AC-3 The Siemens 3RT1044-1AN20 is a SIRIUS S3 power contactor rated for 37 kW at 500 V in AC-3 duty, meaning it handles motor switching loads up to that power level. The contactor carries a mechanical life of 10,000,000 cycles typical, and its AC-3 switching rate maxes out at 1,000 operations per hour. Side-by-side mounting is permitted, which helps when packing multiple contactors into a tight panel row. Solid wire accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded wire handles 2x (10 to 50 mm²). The combined solid-or-stranded range covers 2x (2.5 to 16 mm²). These are the wire sizes the screw terminals are designed for — no ferrule adapters needed for the larger strands. Front protection is IP20 with the cover or box terminal installed; the terminal itself is rated IP00. That means the wiring compartment needs enclosure protection in the panel, but the operator-facing side is touch-safe once the cover is on. ## Coil and auxiliary contact ratings The auxiliary contact block (integrated or add-on) is rated for switching at various control voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, and 3 A at 400 V. These are the make/break capacities for the control circuit — useful when selecting a PLC output or relay to drive the coil. Operating time at AC is 10 to 19 ms, with arcing time between 10 and 15 ms. The contactor is rated for both 50 Hz and 60 Hz supply, with operating ranges of 0.8 to 1.1 times nominal at 50 Hz and 0.85 to 1.1 at 60 Hz.","metaTitle":"Siemens 3RT1044-1AN20 SIRIUS Power Contactor, Size S3, 37 kW","metaDescription":"Siemens 3RT1044-1AN20 SIRIUS power contactor, size S3. Rated 37 kW at 500 V AC-3. Screw terminals, snap-on DIN rail. Current lifecycle stage. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Solid":"2x (0.5 ... 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":"220 V","at 500 V rated value":"37 kW","at 60 Hz rated value":"220 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=527216&mlfb=3RT1044-1AN20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AN20/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT1044-1AN20's listed depth?","answer":"The depth is 139 mm. Combined with a width of 70 mm and height of 146 mm, it fits the standard S3 contactor footprint."},{"question":"What wire sizes does the 3RT1044-1AN20 accept?","answer":"Solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (10 to 50 mm²). Combined solid-or-stranded: 2x (2.5 to 16 mm²)."},{"question":"Will 3RT1044-1AN20 drop into a panel specified around 3RT1044-1FB46 without rewiring?","answer":"Both are SIRIUS S3 contactors with the same mounting footprint (screw and snap-on onto 35 mm or 75 mm rail) and screw-type terminals, so mechanical fit is identical. However, the 3RT1044-1FB46 uses a different coil voltage — verify the control circuit matches before substituting."},{"question":"Where can I buy 3RT1044-1AN20?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1AN20","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/3RT1044-1AN20 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}}