{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2037-1KB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2037-1KB40","canonicalUrl":"https://aoctrl.com/siemens/3RT2037-1KB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2037-1KB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S2 coupling contactor, 24 V DC coil, screw-type terminals, 55 mm width, 130 mm depth, 114 mm height.","salesMarkdown":"## 24 V DC Coil and PLC Output Drive The 3RT2037-1KB40 is a SIRIUS S2 coupling contactor with a 24 V DC coil rated at 10 A at the rated value of 24 V. The inrush current peak is 2.6 A, so the PLC output or DC supply driving the coil must be sized for that surge, not just the holding current. The coil connection uses screw-type terminals, which simplifies field wiring without special tools. ## DIN Rail Footprint and Clearances The contactor measures 55 mm wide, 130 mm deep, and 114 mm high, fitting the S2 frame size. ## Switching Duty and Mechanical Life Rated for AC-3 duty at 700 switching cycles per hour maximum, and the same 700 1/h under AC-3e. AC-4 duty is limited to 200 1/h, reflecting the heavier switching of inrush loads. The typical mechanical life of the contactor is 10,000,000 operations. Arcing time is 10 to 20 ms, and the DC operating time is 30 to 55 ms. ## Environmental Ratings and Auxiliary Contacts The main contacts are rated for 18 to 1 A range, and the unit accepts solid or stranded wire: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) per terminal.","metaTitle":"Siemens 3RT2037-1KB40 SIRIUS Contactor, 24V DC Coil, 55 mm","metaDescription":"Siemens 3RT2037-1KB40 SIRIUS S2 contactor, 24V DC coil rated 10 A at 24 V. 55 mm wide, screw and snap-on DIN rail mount. Active production, sourced per 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","title":"3RT2037-1KB40","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","description":"power contactor, AC-3e/AC-3, 65 A, 30 kW / 400 V, 3-pole, 24 V DC, 0.8-1.2* Us, with integrated varistor, auxiliary contacts: 1 NO + 1 NC, screw terminal, size: S2, suitable for PLC outputs","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":"+/-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 ... 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":"$170.18 – $457.15","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5ce5fd316a79bc50e0153c95e27b4432.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=578161&mlfb=3RT2037-1KB40"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2037-1KB40","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 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}}