{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2037-1KB40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2037-1KB40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT2037-1KB40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2037-1KB40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2037-1KB40-1AA0 coupling contactor, size S2, 24 V DC coil, screw-type terminals, 3-pole main contacts, integrated auxiliary switch, 55 mm width, 130 mm depth, DIN rail mounting.","salesMarkdown":"The 3RT2037-1KB40-1AA0 is a SIRIUS coupling contactor in the size S2 frame, designed for switching loads where the coil circuit is electrically isolated from the main power circuit — common in safety interlocks, PLC-driven contactor banks, or any installation where the control voltage (here, 24 V DC) must not share a path with the load side. The coil draws a 2.6 A inrush peak and holds at 0.8 × the rated 24 V DC, so the PLC output or relay driving it must source that peak without voltage sag. ## Switching frequency and duty — where this contactor lives Maximum switching rates vary by load type: 800 operations/hour at AC-1 (resistive), 700 at AC-3 (squirrel-cage motors), 400 at AC-2 (slip-ring motors), and 200 at AC-4 (plugging/inching). The AC-3e rating also sits at 700 ops/hour. For a conveyor running at 30 starts per hour, this is plenty; for a high-cycle pick-and-place station, the AC-4 ceiling of 200 ops/hour is the hard limit. The main contact configuration is 3-pole (18…1), meaning three normally-open main contacts plus one normally-closed auxiliary contact built in. The auxiliary switch is included, so you don't need a separate side-mount block for basic feedback or status indication. Contact erosion depends on the switched current and duty class; at AC-3 rates, expect the electrical life to be shorter than the mechanical figure. ## Auxiliary contact breaking capacity — voltage matters If you're switching a 24 V DC PLC input, the 10 A rating is well above the typical 10-50 mA load, but at 220 V DC the contact is only good for 0.3 A — that's a hard limit for any DC-13 or resistive load at that voltage.","metaTitle":"Siemens 3RT2037-1KB40-1AA0 SIRIUS Contactor, S2, 24 V Coil","metaDescription":"Siemens 3RT2037-1KB40-1AA0 SIRIUS coupling contactor, size S2, 24 V DC coil, screw-type terminals. Active production, sourced to order against RFQ.","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":"24 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"800 1/h","at AC-2 maximum":"400 1/h","at AC-3 maximum":"700 1/h","at AC-4 maximum":"200 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Full-Scale Value":"1.2","at AC-3e maximum":"700 1/h","For Main Contacts":"18 ... 1","Mounting Position":"standing, on horizontal mounting surface","Size Of Contactor":"S2","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"2.6 A","Product Designation":"Coupling 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":"10 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":"52 A","at 690 V rated value":"1 A","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","Locked-Rotor Current Peak":"2.1 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"40 mA","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","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","safety-related switching OFF":"Yes","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":"0.9 A","Duration Of Locked-Rotor Current":"230 ms","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"70.4 A","at AC-5b up to 400 V rated value":"53.9 A","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For 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":"21.5 W","holding power of magnet coil at DC":"1 W","At Contactor For Auxiliary Contacts":"Screw-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), 2x (18 ... 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), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"DC","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 / 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)","minimum cross-section in main circuit at maximum AC-1 rated value":"25 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","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/99b355274221736c27331269e064e2a7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=578162&mlfb=3RT2037-1KB40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2037-1KB40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2037-1KB40-1AA0 and how do I get a price?","answer":"This part is available through independent distribution channels. No stock-holding claim is made — availability is verified per request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2037-1KB40-1AA0","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/3RT2037-1KB40-1AA0 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}}