{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1AL00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1AL00","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1AL00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AL00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1044-1AL00, size S3, screw-type terminals, 55 A AC-4 at 400 V, 37 kW at 500 V, snap-on mounting.","salesMarkdown":"The 3RT1044-1AL00 occupies 70 mm width on a standard 35 mm or 75 mm DIN rail, secured via the integrated snap-on latch or screws through the base. This is a size S3 power contactor from the SIRIUS family, designed for motor starting and general power switching in control panels. The headline rating is 55 A in AC-4 duty at 400 V — that's the current it can interrupt during inching, plugging, or jogging cycles where the motor is re-energized before it has stopped. For normal AC-3 motor starting (run-up to speed), the contactor handles up to 37 kW at 500 V and 18.6 kW at 690 V. The AC-2 rating of 30 kW at 400 V covers slip-ring motor applications. Resistive loads (AC-1) are switched at up to 1 000 operations per hour; AC-3 allows the same rate, while AC-4 is limited to 300 operations per hour due to the heavier arc stress. The auxiliary contact block terminals accept 2x (0.5... 1.5 mm²) solid or 2x (0.75... 2.5 mm²) stranded. This covers control wiring from 18 AWG up to power feeds for the S3 frame. ## Environmental and protection The contactor body is rated IP20 on the front with the cover or box terminal installed; the terminal area itself is IP00. This supports installation in unheated enclosures or near process heat sources, as long as the ambient stays within the operating window. The 50/60 Hz coil operates with a voltage tolerance of 0.8 to 1.1 times the rated value at 50 Hz.","metaTitle":"Siemens 3RT1044-1AL00 SIRIUS Power Contactor, S3, 55 A AC-4","metaDescription":"Siemens SIRIUS 3RT1044-1AL00 power contactor, size S3, rated 55 A AC-4 at 400 V, 37 kW at 500 V. Screw terminals, snap-on DIN rail mount. Currently in production.","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","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":"125 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=56541&mlfb=3RT1044-1AL00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AL00/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RT1044-1AL00?","answer":"The 3RT1044-1FB46 is a peer within the same S3 frame size, but it uses spring-type terminals instead of screw-type. The 3RT1044-1AL00 has screw terminals; the 1FB46 has cage-clamp terminals. Both share the same AC-4 current rating and mounting footprint, so a panel designed for one can accept the other with a terminal-style change in the wiring schedule."},{"question":"What is the depth of the 3RT1044-1AL00?","answer":"The depth is 139 mm from the mounting surface to the front of the contactor body."},{"question":"What solid conductor wire sizes does the 3RT1044-1AL00 accept?","answer":"The main circuit terminals accept 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and a maximum of 2x (0.75... 4 mm²) solid conductors."},{"question":"Will 3RT1044-1AL00 drop into a panel specified around 3RT1044-1FB46?","answer":"Yes, the mounting footprint and overall dimensions are identical. The only difference is the terminal type: screw-type on the 1AL00 versus spring-type on the 1FB46. Panel layout and DIN-rail position are unchanged."},{"question":"What compliance documentation is available for the 3RT1044-1AL00?","answer":"As a standard Siemens SIRIUS catalog product, the contactor carries IEC/EN 60947-4-1 ratings and UL/CSA listings. RoHS and REACH declarations are available through the manufacturer's documentation portal. The pollution degree 3 rating confirms suitability for industrial environments per IEC 60947-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1AL00","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/3RT1044-1AL00 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}}