{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2026-2KA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2026-2KA40","canonicalUrl":"https://aoctrl.com/siemens/3RT2026-2KA40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2026-2KA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, S0 coupling contactor, 24 VDC coil, spring-type terminals, 45 mm width, screw and snap-on mounting for 35 mm DIN rail (DIN EN 60715).","salesMarkdown":"It's sized for switching DC loads up to 10 A at 24 V, 2 A at 48 V, and 0.3 A at 220 V — so it handles solenoid valves, brake coils, and small DC motor circuits in control panels. The S0 frame (45 mm wide, 102 mm tall, 107 mm deep) snaps onto standard 35 mm DIN rail per DIN EN 60715, and the mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward/backward. That's useful when you're squeezing it into a crowded gland plate area. ## Switching frequency and duty cycle — the real limit This contactor's maximum switching rate depends on the duty category. In AC-1 (resistive loads) it can cycle 1,000 times per hour. For AC-2 and AC-3 (motor starting and running) it drops to 750 operations per hour. AC-4 (plugging, inching) is the hardest — only 250 cycles per hour. The AC-3e rating (750/h) mirrors the standard AC-3 figure. If your application needs frequent jogging or reversing, the 250/h ceiling on AC-4 is the number that governs real panel life — not the AC-1 headline. For auxiliary circuits, twin wires 2x (0.5 to 2.5 mm²) are supported. The spring cage eliminates screw-torque checks — good for high-vibration panels or fast assembly lines. Clearance distances: 10 mm upward, downward, and forward; 6 mm at the sides. That's tight enough for a standard DIN-rail layout without forced spacing. ## Environmental range Storage range is wider: -55 to +80 °C — that's the handling and shipping limit, not the running limit.","metaTitle":"Siemens 3RT2026-2KA40 SIRIUS S0 Coupling Contactor, 24 VDC,","metaDescription":"Siemens SIRIUS 3RT2026-2KA40 S0 coupling contactor, 24 VDC coil, spring-type terminals. Rated 10 A at 24 V DC. Current production lifecycle. Sourced to order against RFQ.","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":"12 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 standard mounting 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-2 at 400 V rated value":"11 kW","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","at AWG cables for main contacts":"2x (18 ... 8)","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":"299 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"200 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"128 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"106 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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3e945128fde6284c0803ae798749dcf5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=11969&mlfb=3RT2026-2KA40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2026-2KA40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2026-2KA40 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here."},{"question":"What is the switching frequency at AC-4 duty for 3RT2026-2KA40?","answer":"At AC-4 (plugging/inching) the maximum switching rate is 250 operations per hour. For AC-3 motor duty it's 750/h."},{"question":"What wire sizes does the 3RT2026-2KA40 accept?","answer":"Main terminals accept solid or stranded wire from 1 to 10 mm². Auxiliary circuits accept twin wires 2x (0.5 to 2.5 mm²). The coil uses spring-type terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2026-2KA40","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/3RT2026-2KA40 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}}