{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-3XB40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-3XB40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-3XB40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-3XB40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, S3 size, 3RT1045-3XB40-0LA2, 45 kW at 500 V, screw-type terminals, 70 mm wide.","salesMarkdown":"The 3RT1045-3XB40-0LA2: This S3-size contactor is rated for motor switching at 45 kW on a 500 V supply and 21.1 kW at 690 V. Those are the AC-3 duty ratings — the ones that govern real motor loads, not the higher AC-1 resistive rating. The 70 mm width and 176 mm height fit a standard 35 mm or 75 mm DIN rail, with screw and snap-on mounting. ## Integration Notes Mounts on 35 mm or 75 mm standard mounting rail via screw and snap-on. Side-by-side mounting is permitted, saving panel width. ## Coil and Auxiliary Circuit The coil is rated 24 V DC, drawing 10 A at the rated value. Switching times: arcing time 10 to 15 ms, DC switching time 14 to 20 ms. Auxiliary contact ratings: 6 A at 230 V, 3 A at 400 V, 1 A at 110 V, 0.3 A at 220 V.","metaTitle":"Siemens 3RT1045-3XB40-0LA2 SIRIUS Power Contactor, S3 Size","metaDescription":"Siemens SIRIUS 3RT1045-3XB40-0LA2 power contactor, S3 size, 45 kW at 500 V, 70 mm wide. Current lifecycle stage. Screw terminals. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"70 mm","at DC":"14 ... 20 ms","Height":"176 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"2x (10 ... 50 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":"900 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":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail","Full-Scale Value":"1.25","Size Of Contactor":"S3","Solid Or Stranded":"2x (2.5 ... 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":"45 kW","at 690 V rated value":"21.1 kW","Instantaneous Contact":"0","Side-By-Side Mounting":"Yes","at 1000 V rated value":"37 W","For Main Current Circuit":"screw-type terminals","at maximum AC-1 rated value":"50 mm²","at AC-2 at 400 V rated value":"37 kW","at AC-4 at 400 V rated value":"66 A","Substance Prohibitance (Date)":"05/01/2012","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"fuse gL/gG: 160 A","closing power of magnet coil at DC":"19 W","holding power of magnet coil at DC":"12 W","With Type Of Coordination 1 Required":"fuse gL/gG: 250 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=7594&mlfb=3RT1045-3XB40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-3XB40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor power ratings for this contactor?","answer":"The contactor is rated for 45 kW at 500 V and 21.1 kW at 690 V under AC-3 duty, which is the relevant rating for switching standard three-phase induction motors."},{"question":"What is the physical size and mounting method?","answer":"The contactor is 70 mm wide, 176 mm high, 152 mm deep. It mounts on 35 mm or 75 mm standard DIN rail using screw and snap-on fastening. Side-by-side mounting is allowed."},{"question":"What type of terminals does the main circuit use?","answer":"The main current circuit uses screw-type terminals, accepting solid or stranded conductors up to 50 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-3XB40-0LA2","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/3RT1045-3XB40-0LA2 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}}