{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-3KF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-3KF40","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-3KF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1026-3KF40 power contactor, size S0, 110 V DC coil with integrated varistor, screw-type main terminals, spring-loaded auxiliary/control terminals, IP20 front, IP00 terminal.","salesMarkdown":"The S0 frame is the compact workhorse in the SIRIUS line, common in control panels for conveyors, pumps, and fans. For resistive loads (AC-12), it's rated 10 A maximum. The main current circuit uses screw-type terminals accepting 2x (0.25...2.5 mm²) solid or 2x (1...2.5 mm²) stranded, with a max of 2x 10 mm². The auxiliary and control circuit uses spring-loaded terminals — no screwdriver needed for the coil and aux wiring, which speeds up panel wiring. The coil draws 4.2 W DC both on pull-in and hold, so there's no inrush spike to worry about on your 110 V DC supply. Type 2 coordination requires a 35 A gL/gG fuse; Type 1 coordination needs a 100 A gL/gG fuse. That's the selectivity headroom you need to design into your branch circuit protection. The IP20 front keeps fingers out; the IP00 terminal area means it's not touch-safe once wired — standard for panel-mount contactors.","metaTitle":"Siemens 3RT1026-3KF40 SIRIUS Power Contactor, S0, 110 V DC C","metaDescription":"Siemens SIRIUS 3RT1026-3KF40 power contactor, size S0, 110 V DC coil with varistor. Screw main terminals, spring-loaded aux. Current production. RFQ for lead time.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"88 mm","Rated Value":"110 V","On The Front":"IP20","Initial Value":"0.7","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.25","Size Of Contactor":"S0","Solid Or Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"11 kW","at 690 V rated value":"11 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"11 kW","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"07/01/2006","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 35 A","closing power of magnet coil at DC":"4.2 W","holding power of magnet coil at DC":"4.2 W","With Type Of Coordination 1 Required":"fuse gL/gG: 100 A","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 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)","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=253005&mlfb=3RT1026-3KF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KF40/alternatives.json"},"ai":{"faq":[{"question":"What are the main terminal wire sizes this contactor accepts?","answer":"The screw-type main terminals accept 2x (0.25...2.5 mm²) solid, 2x (1...2.5 mm²) stranded, and up to 2x 10 mm² maximum. For AWG, that's 2x (16...12), 2x (14...10), and 1x 8."},{"question":"What is the depth of this contactor?","answer":"The depth is 100 mm, with a width of 45 mm and height of 88 mm. It fits the standard S0 frame footprint on 35 mm DIN rail."},{"question":"Does this contactor have a built-in surge suppressor?","answer":"Yes, the surge suppressor design is a varistor integrated into the coil circuit. It's built in, not a separate add-on module."},{"question":"What compliance documentation is available for the 3RT1026-3KF40?","answer":"The part carries a RoHS substance prohibition date of July 1, 2006, confirming EU RoHS compliance. Standard Siemens documentation includes CE declaration and UL/CSA file listings per the SIRIUS series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-3KF40","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/3RT1026-3KF40 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}}