{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2035-3XF44-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2035-3XF44-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2035-3XF44-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2035-3XF44-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S2, 3RT2035-3XF44-0LA2, 110 VDC coil, spring-type terminals, 40 A at 480 V.","salesMarkdown":"It carries a 110 VDC coil with spring-type terminals, rated for continuous duty. The main contacts are rated 40 A at 480 V and 41 A at 600 V, with a 7.5 hp rating at 230 V. The 40 A rating at 480 V and 41 A at 600 V are the continuous current ratings for the main contacts — these define the maximum load the contactor can carry without overheating. For motor starting (AC-3 duty), you'd typically derate; the AC-4 maximum switching frequency is 300 operations per hour, which tells you this contactor isn't meant for high-cycle jogging or plugging applications. The 110 VDC coil draws an inrush peak of 1.5 A, which matters for control transformer sizing and DC power supply selection. The coil hold-in is sustained at the rated 110 VDC; dropout voltage is typically around 70% of rated (77 VDC) — ensure your control voltage doesn't sag below that during line starts. ## Mechanical and electrical endurance Arcing time is 10 to 20 ms at DC, and the contactor is designed for a DC switching range of 30 to 55 ms — this is the time the coil takes to pick up or drop out, affecting timing in safety circuits or sequential logic. Dimensions are 114 mm height, 55 mm width, 178 mm depth. The width — 55 mm — is the key panel-space figure; it occupies one standard 55 mm-wide slot on a DIN rail.","metaTitle":"Siemens 3RT2035-3XF44-0LA2 SIRIUS Power Contactor, 110 VDC C","metaDescription":"Siemens SIRIUS 3RT2035-3XF44-0LA2 power contactor, size S2, 110 VDC coil. Rated 40 A at 480 V, 41 A at 600 V. Screw and snap-on mounting on 35 mm DIN rail. Current lifecycle stage.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"178 mm","Width":"55 mm","at DC":"30 ... 55 ms","Height":"114 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"6 mm","Rated Value":"110 V","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 DIN rail according to DIN EN 60715","Full-Scale Value":"1.25","For Main Contacts":"18 ... 1","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":"S2","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"1.5 A","Product Designation":"Power contactor","at 24 V rated value":"6 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":"7.5 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"40 A","at 500 V rated value":"2 A","at 600 V rated value":"41 A","at 690 V rated value":"1 A","Design Of The Product":"With extended operating range","Instantaneous Contact":"2","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"3 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"15 hp","at 460/480 V rated value":"30 hp","at 575/600 V rated value":"40 hp","at AC-2 at AC-3e maximum":"750 1/h","Locked-Rotor Current Peak":"0.8 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"12 mA","at maximum Ith rated value":"16 mm²","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at maximum AC-1 rated value":"16 mm²","at AC in hot operating state":"6.6 W","at AC-2 at 400 V rated value":"18.5 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"35 A","Substance Prohibitance (Date)":"10/01/2014","Design Of The Surge Suppressor":"with varistor","Duration Of Inrush Current Peak":"50 µs","Locked-Rotor Current Mean Value":"0.45 A","Duration Of Locked-Rotor Current":"230 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: 80A (690V,100kA), aM: 50A (690V,100kA), BS88: 63A (415V,80kA)","Without Load Current Share Typical":"1 W","closing power of magnet coil at DC":"23 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: 160 A (690 V, 100 kA), aM: 80 A (690 V, 100 kA), BS88: 125 A (415 V, 80 kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.2 W","for AWG cables for auxiliary contacts":"2x (20 ... 14)","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":"2","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"DC","up to 40 °C according to IEC 60077 rated value":"60 A","up to 70 °C according to IEC 60077 rated value":"50 A","Limited To 1 S Switching At Zero Current Maximum":"843 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"596 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"400 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"241 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"196 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / Q600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c143b2ddeda318c8d5e36569dfd29f4f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=358779&mlfb=3RT2035-3XF44-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2035-3XF44-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of this contactor?","answer":"Height is 114 mm, width is 55 mm, and depth is 178 mm. Clearance requirements are 10 mm upwards, forwards, and downwards, and 6 mm at the side."},{"question":"Will this contactor fit in a panel designed for a 3RT2027-2AF00?","answer":"No — the 3RT2027-2AF00 is a size S0 frame (45 mm wide typically), while the 3RT2035-3XF44-0LA2 is a size S2 frame (55 mm wide). The wider footprint and different coil voltage (110 VDC vs 230 VAC) mean it will not drop in without panel modifications and control circuit changes."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2035-3XF44-0LA2","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/3RT2035-3XF44-0LA2 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}}