{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2026-1KB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2026-1KB40","canonicalUrl":"https://aoctrl.com/siemens/3RT2026-1KB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2026-1KB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2026-1KB40 coupling contactor, S0 frame, 24 V DC coil, 10 A DC-13 at 24 V, screw terminals, 45 mm width, DIN rail.","salesMarkdown":"## SIRIUS S0 coupling contactor with 24 V DC coil The 3RT2026-1KB40 is a SIRIUS S0 frame coupling contactor from Siemens — a 45 mm wide, 85 mm high, 107 mm deep unit designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. Its coil is rated 24 V DC, and at that voltage the DC-13 switching capacity is 10 A — enough for moderate DC loads like solenoid valves or DC brake coils in a control panel. The contactor ships without an auxiliary switch block (auxiliary switch: no), so if you need feedback or interlocking, plan to add a separate side-mount auxiliary contactor or a SIRIUS aux switch block. ## Switching frequency and duty-cycle limits Maximum switching rates are duty-dependent: 1 000 operations per hour in AC-1 (resistive), 750/h in AC-2 and AC-3 (motor loads), and 250/h in AC-4 (plugging/inching). The AC-3e rating also caps at 750 operations per hour — consistent with the standard AC-3 figure. Arcing time is 10 ms typical, and the DC-13 make/break times are 19 to 21 ms at rated voltage. ## Mounting and clearance requirements Mounting position is flexible: the contactor can be rotated ±180° on a vertical surface and tilted forward or backward by ±22.5°. Minimum clearances to adjacent components: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side — critical for heat dissipation and arc flash containment in a crowded panel. ## Wire termination and conductor sizes Main contact terminals accept solid or stranded conductors from 1 to 10 mm², and the auxiliary terminal block accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire. The magnet coil uses screw-type terminals — standard for panel wiring with ferruled or bare stranded wire. ## Lifecycle and sourcing Sourced through authorized distribution; quoted to order against your BOM quantity. Availability and current pricing confirmed at RFQ.","metaTitle":"Siemens 3RT2026-1KB40 SIRIUS S0 Contactor, 24 V DC, 45 mm","metaDescription":"Siemens 3RT2026-1KB40 SIRIUS S0 coupling contactor, 24 V DC coil, 10 A DC-13 at 24 V. Screw terminals, no aux. Active production, quoted to order.","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","title":"3RT2026-1KB40","Height":"85 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","description":"power contactor, AC-3e/AC-3, 25 A, 11 kW / 400 V, 3-pole, 24 V DC, 0.7-1.25* Us, with plugged-in varistor, auxiliary contacts: 1 NO + 1 NC, screw terminal, size: S0, suitable for PLC outputs, not expandable with auxiliary switch","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-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":"16 ... 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 ... 1.5 mm²), 2x (0.75 ... 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":"screw-type 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":"screw-type 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":"Screw-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)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"1.9 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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":"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","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/251db16ff47ce7e988c394919a069457.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=366955&mlfb=3RT2026-1KB40"},"ai":{"faq":[{"question":"Can auxiliary switches be added to the 3RT2026-1KB40?","answer":"The contactor ships without an auxiliary switch block. You can add a side-mount SIRIUS auxiliary contactor or an aux switch block separately — the contactor has no built-in aux contacts."},{"question":"Is the 3RT2026-1KB40 suitable for PLC output control?","answer":"Yes, the 24 V DC coil is compatible with standard 24 V PLC digital outputs, provided the output driver can sink the coil inrush current. The coil's DC-13 rating at 24 V is 10 A, so the PLC output must be rated for at least that inrush."},{"question":"What are the mounting clearances for the 3RT2026-1KB40?","answer":"Minimum clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. The contactor can be rotated ±180° on a vertical surface and tilted ±22.5°."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2026-1KB40","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/3RT2026-1KB40 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}}