{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2037-1KB40-0HT0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2037-1KB40-0HT0","canonicalUrl":"https://aoctrl.com/siemens/3RT2037-1KB40-0HT0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2037-1KB40-0HT0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, coupling contactor, size S2, 3RT2037-1KB40-0HT0, 24 VDC coil, screw terminals, 55 mm width, 114 mm height, 130 mm depth.","salesMarkdown":"## SIRIUS S2 Coupling Contactor — 24 VDC Coil, Screw Terminals The Siemens 3RT2037-1KB40-0HT0 is a SIRIUS-branded coupling contactor in the S2 frame size, designed for interlocking or sequencing two contactors in applications such as reversing motor starters or mains changeover circuits. The coil is rated 24 VDC with a holding current of 10 A at 24 V, and the main contact configuration is 18 normally open plus 1 normally closed (18 NO + 1 NC). Mounting is via screw fixing or snap-on onto 35 mm DIN rail per DIN EN 60715, with a width of 55 mm, height of 114 mm, and depth of 130 mm. The coil connection uses screw-type terminals, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire. An auxiliary switch is integrated, and the contactor includes a mechanical interlock feature inherent to the coupling design. ## Duty Ratings and Switching Frequency Maximum switching frequency varies by duty category: 800 operations per hour at AC-1 (resistive), 700/h at AC-3 (squirrel-cage motor starting), 400/h at AC-2 (slip-ring motor), and 200/h at AC-4 (plugging/inching). The AC-3e rating matches the AC-3 figure at 700/h. These limits govern thermal rise in the contactor; exceeding them risks accelerated contact wear. Arcing time is 10 to 20 ms, and the DC operating time (coil pull-in/drop-out) is 30 to 55 ms. Inrush current peak at coil energization is 2.6 A. The contactor's mechanical life is typically 10 million operations. ## Environmental and Clearance Specifications These spacings must be maintained for proper heat dissipation and arc containment.","metaTitle":"Siemens 3RT2037-1KB40-0HT0 SIRIUS S2 Coupling Contactor, 24","metaDescription":"Siemens SIRIUS 3RT2037-1KB40-0HT0 coupling contactor, size S2, 24 VDC coil, 10 A holding current. Screw terminals, DIN rail mount. Current lifecycle stage. Sourced to order against","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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":"+/-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","Safety-Related Switching On":"No","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","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","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/f9e4191b462bb40c690e56dfe2cec585.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1400379&mlfb=3RT2037-1KB40-0HT0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2037-1KB40-0HT0/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of the 3RT2037-1KB40-0HT0?","answer":"Width is 55 mm, height is 114 mm, and depth is 130 mm. The contactor mounts on 35 mm DIN rail per DIN EN 60715."},{"question":"What coil voltage does this contactor use?","answer":"The coil is rated 24 VDC with a holding current of 10 A at rated voltage. Inrush peak is 2.6 A."},{"question":"What is the main contact configuration?","answer":"The main contacts are arranged as 18 normally open and 1 normally closed (18 NO + 1 NC)."},{"question":"Where can I buy the 3RT2037-1KB40-0HT0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quotation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2037-1KB40-0HT0","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/3RT2037-1KB40-0HT0 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}}