{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2026-2KB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2026-2KB40","canonicalUrl":"https://aoctrl.com/siemens/3RT2026-2KB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2026-2KB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2026-2KB40 coupling contactor, size S0, 24 V DC coil, spring-type terminals, 10 A rated at 24 V DC, DIN rail snap-on mounting.","salesMarkdown":"The 3RT2026-2KB40 is a coupling contactor for switching between control circuits or isolating panel sections. The 24 V DC coil pulls in reliably across the operating temperature range of -25 to +60 °C, and storage tolerance goes from -55 to +80 °C — so it handles unheated warehouses or hot cabinets without issue. The coil connection uses spring-type terminals (rated for solid or stranded 1 to 10 mm²), which saves wiring time compared to screw terminals, especially in high-density panels. Main contact current ratings vary by duty: the 18 to 8 A range covers AC-1 through AC-4 loads. At 24 V DC the switching capacity is 10 A, dropping to 2 A at 48/60 V DC, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V — so if you're switching DC loads above 24 V, the current derating is significant. For AC motor loads at 230 V it's rated 3 hp, and at 400 V AC it handles 3 A. Mechanical life is typical 10 million operations, and the maximum switching frequency varies by duty: 1,000 cycles/hour at AC-1, 750 at AC-2/AC-3, and 250 at AC-4. Arcing time is 10 to 10 ms, and the coil pick-up/drop-out at DC is 19 to 21 ms — fast enough for most sequencing applications but not for precision timing. The dimensions are 45 mm wide, 102 mm high, and 107 mm deep — so it occupies about the same footprint as a standard miniature circuit breaker. The contactor has no auxiliary switch built in (auxiliary switch is listed as \"No\"), so if you need feedback contacts for a PLC or status indication, you'll need to add a separate auxiliary contact block. The main contacts are rated for 2x (0.5 to 2.5 mm²) solid or stranded wire, and the coil terminals accept 1 to 10 mm² solid or stranded. The closest functional sibling in the same S0 frame is the 3RT2026-1KB40 (same coil voltage, different terminal type — screw terminals instead of spring-type). The 3RT2026-2BB40-ZW96 and -2BB44-ZX95 variants use different coil voltages or special versions.","metaTitle":"Siemens 3RT2026-2KB40 SIRIUS Coupling Contactor, 24V DC Coil","metaDescription":"Siemens SIRIUS 3RT2026-2KB40 coupling contactor, S0 size, 24V DC coil, spring-type terminals, 10A rated at 24V DC. Active production. DIN rail mount. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"107 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at DC":"19 ... 21 ms","Height":"102 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","Auxiliary Switch":"No","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":"1.25","at AC-3e maximum":"750 1/h","For Main Contacts":"18 ... 8","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":"S0","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","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":"3 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"21 A","at 500 V rated value":"2 A","at 600 V rated value":"22 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"2 hp","at 200/208 V rated value":"5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 hp","at 575/600 V rated value":"20 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"5.7 W","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"15.5 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"35.2 A","at AC-5b up to 400 V rated value":"20.7 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 35A (690V, 100kA), aM: 20A (690V, 100kA), BS88: 35A (415V, 80kA)","Without Load Current Share Typical":"4.5 W","closing power of magnet coil at DC":"4.5 W","holding power of magnet coil at DC":"4.5 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 100 A (690 V, 100 kA), aM: 50 A (690 V, 100 kA), BS88: 100 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":"1.9 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","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 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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":"375 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"300 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"210 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"144 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"118 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":"10 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":"$64.77","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5f2ed57377baa04cc27a52ece143a0f6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=115536&mlfb=3RT2026-2KB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2026-2KB40/alternatives.json"},"ai":{"faq":[{"question":"Will this drop into a panel designed for the 3RT2026-2BB40-ZW96?","answer":"Mechanically yes — same S0 frame, same 45 mm DIN rail footprint. Electrically you need to verify the coil voltage: the 2KB40 uses 24 V DC, while the ZW96 variant may differ. If coil voltage matches, it's a direct swap without rewiring the main contacts."},{"question":"What compliance documentation does this contactor carry?","answer":"The evidence does not list specific compliance marks (UL, CSA, CE, RoHS, REACH) for this order code. As a Siemens SIRIUS catalog item, it typically carries CE marking for the European market and may have UL/CSA certifications depending on the specific variant. Verify with the manufacturer's declaration for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2026-2KB40","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/3RT2026-2KB40 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}}