{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2037-3XJ44-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2037-3XJ44-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2037-3XJ44-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2037-3XJ44-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, contactor, size S2, 3RT2037-3XJ44-0LA2, 65 A at 480 V, 52 A at 600 V, spring-type coil terminals, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"The Siemens 3RT2037-3XJ44-0LA2 is a SIRIUS-branded contactor in size S2, rated 65 A at 480 V and 52 A at 600 V — those are the thermal current values that govern continuous motor-load switching in AC-3 duty. The 65 A at 480 V figure means this contactor handles a 65 A motor load at that voltage without exceeding temperature rise limits; the 52 A at 600 V derates slightly due to higher voltage stress on the arc chamber. For a 480 V three-phase motor, that 65 A rating typically covers a 50 hp motor, though exact sizing depends on the motor FLA and service factor. The contactor carries a 10 hp rating at 230 V, confirming its intended use for larger industrial loads, not fractional-horsepower machines. The 178 mm depth, 55 mm width, and 114 mm height mean it fits standard S2 contactor footprints; verify your enclosure depth clears the 178 mm with wiring space. ## Coil and auxiliary details The coil is DC-operated with spring-type terminals. Rated coil voltage is 72 V DC, with an extended operating range design (0.7 to 1.25 times rated value). The DC coil draws 6 A at 24 V rated value, 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, 2 A at 500 V, and 1 A at 690 V — these are the coil inrush/holding currents at various DC control voltages. For a 72 V DC coil, the actual draw will fall between the 60 V and 110 V curves; expect roughly 1.5 A inrush. The spring-type terminals accept 2x (0.5 to 2.5 mm²) solid or stranded wire — use ferrules on stranded for reliable termination.","metaTitle":"Siemens 3RT2037-3XJ44-0LA2 SIRIUS Contactor, 480V 65A, Size","metaDescription":"Siemens SIRIUS contactor 3RT2037-3XJ44-0LA2, size S2, rated 65 A at 480 V, 52 A at 600 V. Spring-type coil terminals, DIN rail mount. Current-production lifecycle stage. Quoted to","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":"72 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","Type Of Voltage":"DC","at AC-4 maximum":"200 1/h","lifecycle_stage":"current","Auxiliary Switch":"No","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":"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","Product Designation":"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":"10 hp","at 400 V rated value":"3 A","at 480 V rated value":"65 A","at 500 V rated value":"2 A","at 600 V rated value":"52 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":"5 hp","at 200/208 V rated value":"20 hp","at 220/230 V rated value":"20 hp","at 460/480 V rated value":"50 hp","at 575/600 V rated value":"50 hp","at AC-2 at AC-3e maximum":"400 1/h","Relative Humidity Minimum":"10 %","at maximum Ith rated value":"25 mm²","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at maximum AC-1 rated value":"25 mm²","at AC in hot operating state":"11.4 W","at AC-2 at 400 V rated value":"30 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","at AWG cables for main contacts":"2x (18 ... 2), 1x (18 ... 1)","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: 125A (690V,100kA), aM: 63A (690V,100kA), BS88: 100A (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)","at AWG cables for auxiliary contacts":"2x (20 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"3.8 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":"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":"80 A","up to 70 °C according to IEC 60077 rated value":"60 A","Limited To 1 S Switching At Zero Current Maximum":"1 055 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"730 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"520 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"336 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"272 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/49c5a0efe9d182223fd21399a991cc1f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=555870&mlfb=3RT2037-3XJ44-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2037-3XJ44-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of 3RT2037-3XJ44-0LA2?","answer":"Depth is 178 mm, width is 55 mm, height is 114 mm. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side."},{"question":"What type of coil terminals does this contactor have?","answer":"Spring-type terminals for the magnet coil — no screw tightening required. Accepts 2x (0.5 to 2.5 mm²) solid or stranded wire."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2037-3XJ44-0LA2","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/3RT2037-3XJ44-0LA2 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}}