{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2038-3XF40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2038-3XF40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2038-3XF40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2038-3XF40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS size S2 power contactor, 3RT2038-3XF40-0LA2, 110 V DC coil, spring-type terminals, rated 65 A at 480 V, 62 A at 600 V.","salesMarkdown":"## Panel fit and coil details The DC coil pulls 1.5 A inrush and picks up at 70% of rated voltage; dropout is at 125% of rated, with a dropout time of 30 to 55 ms. That dropout window matters for sequencing logic — if your control scheme relies on a fast drop, the 30 ms floor is the number to design around. Rated 65 A at 480 V and 62 A at 600 V — those are the AC-3 motor-switching figures that govern real motor loads. The 65 A at 480 V means it can handle a 50 hp motor at 480 V three-phase; the 62 A at 600 V covers a 60 hp motor at that voltage. For resistive loads (AC-1), the contactor carries higher current, but the motor-duty number is the one that decides fit for pump, fan, or compressor duty. The main contact configuration is listed as 18 to 1 — that's 3 normally open power poles plus 1 normally open auxiliary, with a separate auxiliary switch block included. Dimensions: 114 mm high, 55 mm wide, 130 mm deep. The 55 mm width is the DIN-rail footprint — it occupies three 18 mm module spaces, which is standard for a size S2 contactor. That 6 mm side clearance is tighter than the vertical clearances, so when packing multiple contactors side-by-side on the rail, the 6 mm gap is the limiting dimension. Wire size: 2 x 0.5 to 2.5 mm² solid or stranded — spring terminals, so no screw torque to verify, but strip length must be consistent. ## Switching performance and auxiliary ratings For DC switching, the arc extinguishes faster than AC because of the natural current zero, but the 10-20 ms window is normal for a DC coil contactor at these power levels. Maximum switching frequency in AC-4 duty (plugging/reversing) is 150 operations per hour — that's the limit for severe switching, not continuous running. For the auxiliary contacts, rated currents at various DC voltages: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, 0.6 A at 440 V, 2 A at 500 V.","metaTitle":"Siemens 3RT2038-3XF40-0LA2 SIRIUS Power Contactor, 110 V DC","metaDescription":"Siemens SIRIUS 3RT2038-3XF40-0LA2 power contactor, size S2, 110 V DC coil, spring-type terminals, 65 A at 480 V. Current lifecycle stage. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"130 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":"150 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":"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 440 V rated value":"0.6 A","at 480 V rated value":"65 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","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"5 hp","at 200/208 V rated value":"20 hp","at 220/230 V rated value":"25 hp","at 460/480 V rated value":"50 hp","at 575/600 V rated value":"60 hp","at AC-2 at AC-3e maximum":"350 1/h","Locked-Rotor Current Peak":"0.8 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"12 mA","at maximum Ith rated value":"35 mm²","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at maximum AC-1 rated value":"35 mm²","at AC in hot operating state":"17.1 W","at AC-2 at 400 V rated value":"37 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"55 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: 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":"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: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"5.7 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":"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":"90 A","up to 70 °C according to IEC 60077 rated value":"75 A","Limited To 1 S Switching At Zero Current Maximum":"1 298 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"898 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"640 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"414 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"333 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":"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/85dd815b1fd4262114d31b87c21bf1dc.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=338877&mlfb=3RT2038-3XF40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2038-3XF40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2038-3XF40-0LA2 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What are the key dimensions of 3RT2038-3XF40-0LA2?","answer":"Height is 114 mm, width is 55 mm, depth is 130 mm. The 55 mm width fits three 18 mm DIN-rail module spaces."},{"question":"What clearance is needed around 3RT2038-3XF40-0LA2 in the panel?","answer":"Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. The 6 mm side clearance is the tightest dimension."},{"question":"What is the coil voltage and type for 3RT2038-3XF40-0LA2?","answer":"The coil is 110 V DC, with spring-type terminals. Inrush current peak is 1.5 A; pick-up voltage is 70% of rated, dropout is at 125% of rated."},{"question":"What is the maximum motor current at 480 V for this contactor?","answer":"Rated 65 A at 480 V in AC-3 duty, which corresponds to approximately 50 hp at 480 V three-phase. At 600 V it is rated 62 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2038-3XF40-0LA2","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/3RT2038-3XF40-0LA2 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}}