{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1AM20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1AM20","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1AM20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AM20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, 3RT1044-1AM20, S3 size, 37 kW at 500 V AC-3, screw terminals, IP20 front, DIN rail mount.","salesMarkdown":"## SIRIUS S3 Power Contactor for Motor Loads The Siemens 3RT1044-1AM20 is an S3-size SIRIUS power contactor rated for 37 kW at 500 V in AC-3 duty, meaning it handles the inrush and switching of standard three-phase squirrel-cage motors up to that load. The 690 V rating of 18.6 kW confirms its capability on higher-voltage European or marine supplies. This is the rating that governs real motor switching — not the thermal current, but the AC-3 figure that accounts for the inductive break. The contactor accepts solid conductors from 0.5 mm² up to 4 mm² on the control side and stranded conductors up to 50 mm² on the power side, covering most motor feeder sizes up to the S3 frame. Side-by-side mounting is permitted, so multiple contactors can be ganged without spacing gaps — useful for grouped motor starters in a compact MCC section. The S3 frame dimensions are 70 mm wide by 146 mm high by 139 mm deep, fitting a standard 200 mm deep enclosure with room for wiring gutters. Front protection is IP20 with the cover or box terminal installed, which is the minimum for finger-safe touch protection inside a locked panel. The terminal area itself is IP00, so live parts are exposed during wiring — standard practice, but a reminder to de-energize before landing conductors. The 10 million mechanical life cycles (typical) and AC-3 switching rate of 1000 cycles per hour give a realistic service life for high-cycling conveyor or pump applications.","metaTitle":"Siemens 3RT1044-1AM20 SIRIUS Power Contactor, 37 kW at 500 V","metaDescription":"Siemens 3RT1044-1AM20 SIRIUS power contactor, S3 size, 37 kW at 500 V AC-3, screw terminals, IP20 front, active production, DIN rail mount.","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":"208 V","at 500 V rated value":"37 kW","at 60 Hz rated value":"208 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=40889&mlfb=3RT1044-1AM20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AM20/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RT1044-1AM20?","answer":"The peer 3RT1044-1FB46 is the same S3 frame size and AC-3 rating but uses spring-cage terminals on the main circuit instead of screw terminals. The 3RT1044-1AM20 will not drop into a panel wired for the -1FB46 without changing the terminal interface — the mounting footprint and coil voltage differ, so verify the coil data and wiring method before substituting."},{"question":"What are the key ratings for this contactor?","answer":"AC-3 motor rating of 37 kW at 500 V and 18.6 kW at 690 V. Coil draw is 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. Mechanical life is 10 million cycles typical. Operating temperature range is -25 to +60 °C."},{"question":"What compliance documentation is available for 3RT1044-1AM20?","answer":"As a Siemens SIRIUS product, this contactor carries CE marking for the European market and is designed to IEC 60947-4-1 standards. UL and CSA approvals are typical for the SIRIUS line, though specific certification markings should be confirmed on the nameplate for the exact variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1AM20","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/3RT1044-1AM20 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}}