{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3AN20-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3AN20-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3AN20-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AN20-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1044-3AN20-1AA0, screw-type terminals, 37 kW at 400 V 50 Hz, 18.6 kW at 690 V, IP20 front.","salesMarkdown":"Rated for 37 kW at 400 V 50 Hz and 18.6 kW at 690 V, this contactor handles the motor starting and stopping duties common on pumps, conveyors, and compressors in a 400 V three-phase line. The main current circuit uses screw-type terminals, accepting solid conductors 2x (0.25... 2.5 mm²) and stranded 2x (10... 50 mm²). That range covers control wiring up to motor power cables, so you can land both the coil wires and the load conductors without adapters. Switching capacity at 24 V is 10 A, at 230 V is 6 A, and at 400 V is 3 A — these are the contactor's rated operational currents for the main contacts across common control and power voltages. The AC-1 maximum switching rate is 1 000 cycles per hour, AC-3 also 1 000 1/h, while AC-4 (plugging/inching) is limited to 300 1/h, which governs how aggressively you can cycle the load. Arcing time spans 10 to 19 ms at AC, with a narrower 10 to 15 ms window for the arc itself. That's fast enough to limit contact wear in normal motor switching but matters if you're coordinating with upstream protection — the arc clears before the breaker's short-time delay. IP20 on the front with the cover or box terminal installed; the terminal body itself is IP00. That means the front is touch-safe in a closed panel, but the wiring compartment expects enclosure protection — standard for a panel-mounted contactor.","metaTitle":"Siemens 3RT1044-3AN20-1AA0 SIRIUS Power Contactor, S3, 37 kW","metaDescription":"Siemens SIRIUS 3RT1044-3AN20-1AA0 power contactor, size S3, screw terminals. Rated 37 kW at 400 V 50 Hz. Active production. Quoted 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":"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":"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=286034&mlfb=3RT1044-3AN20-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AN20-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT1044-3AN20-1AA0?","answer":"The peer 3RT1044-1FB46 is a size S3 SIRIUS contactor with similar ratings, but it uses a different coil voltage or auxiliary configuration — verify the coil rating and terminal layout before substituting into a panel designed around the -3AN20-1AA0."},{"question":"Will 3RT1044-3AN20-1AA0 drop into a panel specified around 3RT1044-1FB46 without rewiring?","answer":"Both are size S3 and share the same mounting footprint on 35 mm or 75 mm DIN rail, so mechanical fit is identical. However, the coil voltage and auxiliary contact arrangement may differ — check the nameplate coil rating before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3AN20-1AA0","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/3RT1044-3AN20-1AA0 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}}