{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1AJ60","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1AJ60","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1AJ60","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AJ60","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1044-1AJ60, 37 kW at 500 V AC, 18.6 kW at 690 V, screw-type terminals, snap-on DIN rail mounting.","salesMarkdown":"The Siemens SIRIUS 3RT1044-1AJ60 is a size S3 power contactor, rated for switching motor loads up to 37 kW at 500 V AC and 18.6 kW at 690 V AC. The 37 kW rating at 500 V AC is the AC-3 motor-switching figure — that's the one that governs real motor duty, not the higher resistive-load number. At 690 V it still handles 18.6 kW, so it covers 400 V and 480 V systems with headroom. The contactor measures 146 mm tall, 70 mm wide, and 139 mm deep — a compact S3 footprint that fits a standard DIN-rail layout without crowding adjacent devices. Wire capacity is generous: stranded cable up to 2x 50 mm² on the main terminals, and solid or stranded control wiring from 0.5 to 4 mm². The screw terminals accept two conductors per clamp, which simplifies daisy-chaining in a motor control center. ## Switching frequency and coil data Electrical switching frequency depends on duty: up to 1,000 cycles per hour at AC-1 (resistive) and AC-3 (motor), 400 at AC-2, and 300 at AC-4 (plugging/inching). The coil operates at 50/60 Hz with a voltage tolerance of 0.8 to 1.1 times rated, and the arcing time runs 10 to 15 ms.","metaTitle":"Siemens SIRIUS 3RT1044-1AJ60 Power Contactor, S3, 37 kW at 5","metaDescription":"Siemens SIRIUS 3RT1044-1AJ60 power contactor, size S3. Rated 37 kW at 500 V AC, 18.6 kW at 690 V. Screw terminals, snap-on DIN rail. Current production. 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":"0.8 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","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":"92 V","at 500 V rated value":"37 kW","at 60 Hz rated value":"110 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":"20 VA","apparent pick-up power of magnet coil at AC":"232 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":"0.55","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.28","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=99602&mlfb=3RT1044-1AJ60","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AJ60/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for 3RT1044-1AJ60?","answer":"It's a size S3 power contactor rated 37 kW at 500 V AC and 18.6 kW at 690 V AC for motor duty (AC-3). Mechanical life is 10 million operations. It mounts on 35 mm or 75 mm DIN rail and uses screw-type terminals."},{"question":"Where can I buy 3RT1044-1AJ60?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"Will 3RT1044-1AJ60 drop into a panel specified for 3RT1044-1FB46?","answer":"Both are SIRIUS S3 power contactors with the same DIN-rail footprint and screw terminals, so mechanical fit is the same. The 1AJ60 uses a 50/60 Hz AC coil; the 1FB46 uses a different coil voltage. Check the coil rating before swapping — the mounting and main power connections are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1AJ60","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/3RT1044-1AJ60 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}}