{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2045-3XJ40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2045-3XJ40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2045-3XJ40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2045-3XJ40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor, size S3, order code 3RT2045-3XJ40-0LA2, 77 A at 480 V AC-3, spring-type terminals, 72 VDC coil with extended operating range, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"## What this SIRIUS contactor carries The Siemens 3RT2045-3XJ40-0LA2 is a size S3 SIRIUS contactor rated 77 A at 480 V and 62 A at 600 V in AC-3 duty — those are the motor-switching numbers that govern the BOM line, not the resistive AC-1 curve. The coil is 72 VDC with an extended operating range, meaning it holds in through dips that would drop a standard coil, a real advantage on DC-supplied control buses with voltage sag. Spring-type terminals on both coil and main contacts — no torquing, no re-tightening on a thermal cycle, which saves panel-build time and eliminates a common vibration-loosening failure point. The 70 mm width and 140 mm height are the S3 frame footprint — same as the rest of the SIRIUS S3 family, so a panel laid out for a 3RT1054 or 3RT1055 accepts this without re-drilling. Depth is 152 mm, which includes the arc chamber and terminal projection. Listed as current production — no NRND flag, no LTB notice. This is the standard catalogue part, not a phase-out variant.","metaTitle":"Siemens 3RT2045-3XJ40-0LA2 SIRIUS Contactor, 77 A at 480 V,","metaDescription":"Siemens 3RT2045-3XJ40-0LA2 SIRIUS contactor, size S3, 77 A at 480 V AC-3. Spring-type terminals, extended operating range coil 72 VDC. DIN rail mount. Current production, quoted to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Width":"70 mm","at DC":"38 ... 57 ms","title":"3RT2045-3XJ40-0LA2","Height":"140 mm","Upwards":"10 mm","Forwards":"20 mm","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"10 mm","Rated Value":"72 V","description":"traction contactor, AC-3e/AC-3, 80 A, 37 kW / 400 V, 3-pole, 72 V DC, 0.7-1.25* Us, electronic drive, with integrated varistor, auxiliary contacts: 1 NO + 1 NC, main circuit: screw terminal, control and auxiliary circuit: spring-loaded terminal, size: S3","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","Type Of Voltage":"DC","at AC-4 maximum":"300 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715","Full-Scale Value":"1.25","For Main Contacts":"10 ... 2","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S3","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"15 hp","at 400 V rated value":"3 A","at 480 V rated value":"77 A","at 500 V rated value":"2 A","at 600 V rated value":"62 A","at 690 V rated value":"1 A","Design Of The Product":"With extended operating range","Instantaneous Contact":"1","Side-By-Side Mounting":"Yes","at 1000 V rated value":"37 kW","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"7.5 hp","at 200/208 V rated value":"25 hp","at 220/230 V rated value":"30 hp","at 460/480 V rated value":"60 hp","at 575/600 V rated value":"60 hp","at AC-2 at AC-3e maximum":"400 1/h","Relative Humidity Minimum":"10 %","at maximum Ith rated value":"50 mm²","Of Main Circuit Rated Value":"8 kV","at AC-3 rated value maximum":"1 000 V","at maximum AC-1 rated value":"50 mm²","at AC in hot operating state":"15.9 W","at AC-2 at 400 V rated value":"37 kW","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"66 A","Substance Prohibitance (Date)":"03/01/2017","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2)","Duration Of Locked-Rotor Current":"150 ms","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","Product Function Bus Communication":"No","With Type Of Assignment 2 Required":"gG: 160A (690V,100kA), aM: 80A (690V,100kA), BS88: 125A (415V,80kA)","Without Load Current Share Typical":"1 W","closing power of magnet coil at DC":"64 W","holding power of magnet coil at DC":"1 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)","at AWG cables for auxiliary contacts":"2x (20 ... 16)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"5.3 W","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)","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"No","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Type Of Voltage Of The Control Supply Voltage":"DC","up to 40 °C according to IEC 60077 rated value":"125 A","up to 70 °C according to IEC 60077 rated value":"90 A","Limited To 1 S Switching At Zero Current Maximum":"1 500 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"1 186 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"851 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"538 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"423 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"1 000 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"gG: 10 A (500 V, 1 kA)","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7d28fa7380658c541019ac8751bc4da6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629839&mlfb=3RT2045-3XJ40-0LA2"},"ai":{"faq":[{"question":"Will 3RT2045-3XJ40-0LA2 drop into a panel laid out for a 3RT1054-2AP36?","answer":"Yes — both are size S3 SIRIUS contactors sharing the same 70 mm width and 140 mm height footprint, and both mount on 35 mm DIN rail per DIN EN 60715. The 3RT2045 uses spring-type terminals versus screw terminals on the 3RT1054, so the wiring method differs, but the mechanical envelope and rail position are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2045-3XJ40-0LA2","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/3RT2045-3XJ40-0LA2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}