{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-3XB44-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-3XB44-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-3XB44-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-3XB44-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1034-3XB44-0LA2, Size S2, screw-type terminals, 18.5 kW at 500 V, 10 kW at 690 V, 2 instantaneous contacts, DIN rail mount.","salesMarkdown":"Rated for motor duty at 18.5 kW at 500 V and 10 kW at 690 V, this contactor handles the typical three-phase induction motor loads found on conveyors, pumps, and compressors in a 400 V to 690 V line. The 55 mm width and 142 mm height fit a standard DIN-rail footprint, with 10 mm clearance required upwards, downwards, forwards, and at the sides for airflow and wiring access. Side-by-side mounting is permitted, so multiple contactors can be ganged without additional spacing — useful when building a compact motor starter bank. ## Wiring and termination Main circuit terminals accept solid conductors 2x (0.25 to 2.5 mm²) and stranded conductors 2x (0.75 to 25 mm²), with a maximum cross-section of 16 mm² for AC-1 rated connections. The screw-type termination is field-serviceable with standard tools. Auxiliary contact ratings: 10 A at 24 V DC, 6 A at 230 V AC, and 2 A at 60 V DC, covering typical PLC and relay interface loads. For a critical-spare holding on an existing SIRIUS-based panel, this is the direct drop-in replacement for the same Size S2 footprint.","metaTitle":"Siemens 3RT1034-3XB44-0LA2 SIRIUS Power Contactor, Size S2,","metaDescription":"Siemens SIRIUS power contactor 3RT1034-3XB44-0LA2, Size S2, screw terminals, 18.5 kW at 500 V, 10 kW at 690 V. Current lifecycle stage. DIN rail mount. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"179 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"55 mm","at DC":"20 ... 30 ms","Height":"142 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"2x (0.75 ... 25 mm²)","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","Rated Value":"24 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","at AC-1 maximum":"1 200 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.25","Size Of Contactor":"S2","Solid Or Stranded":"2x (0.75 ... 16 mm²)","Product Brand Name":"SIRIUS","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 500 V rated value":"18.5 kW","at 690 V rated value":"10 kW","Instantaneous Contact":"2","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at maximum AC-1 rated value":"16 mm²","at AC-2 at 400 V rated value":"15 kW","at AC-4 at 400 V rated value":"29 A","Substance Prohibitance (Date)":"05/01/2012","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (18 ... 2)","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"fuse gL/gG: 63 A","closing power of magnet coil at DC":"15 W","holding power of magnet coil at DC":"11 W","With Type Of Coordination 1 Required":"fuse gL/gG: 125 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","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type Of Voltage Of The Control Supply Voltage":"DC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","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=61832&mlfb=3RT1034-3XB44-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-3XB44-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to the 3RT1034-3XB44-0LA2?","answer":"The 3RT1036-1AB00 is a larger-frame SIRIUS contactor (Size S3) with higher ratings. It will not drop into a panel wired for the Size S2 3RT1034-3XB44-0LA2 without rewiring and resizing the mounting footprint. For a direct Size S2 replacement, stick with the 3RT1034 frame."},{"question":"What are the key motor ratings for this contactor?","answer":"Rated at 18.5 kW at 500 V and 10 kW at 690 V for AC-2/AC-3 motor duty. Maximum switching frequency is 1000 operations per hour at AC-3 and 750 at AC-2."},{"question":"What compliance documentation is available for this part?","answer":"The SIRIUS series carries CE marking for the European market and is designed to IEC 60947-4-1 standards. Specific UL/CSA certification data should be confirmed from the manufacturer's declaration on the specific variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-3XB44-0LA2","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/3RT1034-3XB44-0LA2 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}}