{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1AF00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1AF00","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1AF00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AF00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1044-1AF00, screw-type terminals, 30 kW AC-2 at 400 V, 55 A AC-4 at 400 V, IP20 front, snap-on 35/75 mm DIN rail.","salesMarkdown":"The Siemens 3RT1044-1AF00 is a SIRIUS S3-frame power contactor, screw-type terminals on the main circuit, rated for motor switching at 30 kW in AC-2 duty at 400 V — that's the slip-ring motor or wound-rotor load where starting current stays moderate. For AC-4 duty (plugging, inching, reversing) it handles 55 A at 400 V, so it takes the high-stress cycles of frequent reversals without derating prematurely. Snap-on mounting onto 35 mm or 75 mm standard DIN rail, with screw fixing as backup. The S3 frame is 70 mm wide, 146 mm tall, 139 mm deep. Rated for 50 Hz operation, with a rated control supply voltage of 110 V at 50 Hz. Coil draws 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V — the 110 V coil variant means you run it off a standard control transformer without an extra DC supply. ## Termination and wiring — screw terminals, stranded up to 50 mm² Accepts stranded conductors up to 2x 50 mm² — enough for the full AC-2 current without paralleling. Solid wire range is 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). The terminal rating is IP00, so the connection point itself is not sealed — the IP20 rating on the front with cover or box terminal is what protects the operator. Side-by-side mounting is allowed — no derating gap required for adjacent contactors on the rail, which saves panel width when grouping multiple motor starters.","metaTitle":"Siemens 3RT1044-1AF00 SIRIUS S3 Power Contactor, 30 kW AC-2","metaDescription":"Siemens 3RT1044-1AF00 SIRIUS S3 power contactor. 30 kW AC-2 at 400 V, 55 A AC-4. Screw terminals, IP20 front. Current production. Sourced to order against RFQ.","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","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 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":"110 V","at 500 V rated value":"37 kW","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":"21 VA","apparent pick-up power of magnet coil at AC":"218 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":"0.61","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.26","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=178897&mlfb=3RT1044-1AF00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AF00/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1044-1AF00?","answer":"The peer 3RT1044-1FB46 shares the same S3 frame and screw-terminal main circuit, but check the coil voltage — 3RT1044-1FB46 uses a different control supply. The 3RT5044-1BM40 and 3RT5045-1AF00 are SIRIUS S3 variants with different coil configurations or auxiliary contact blocks. For a drop-in replacement without rewiring, verify the coil rating against your control transformer."},{"question":"What compliance documentation does 3RT1044-1AF00 carry?","answer":"RoHS compliance is confirmed with a substance prohibition date of 05/01/2012. REACH and UL documentation are standard for Siemens SIRIUS contactors — request the declaration of conformity through the distributor at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1AF00","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/3RT1044-1AF00 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}}