{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-1KB40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-1KB40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-1KB40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1KB40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1026-1KB40-1AA0 power contactor, size S0, 24 VDC coil, 11 kW rated power at 400 V AC-3, screw-type terminals, integrated varistor.","salesMarkdown":"It carries an 11 kW motor rating at 400 V under AC-3 duty (the standard for squirrel-cage motors starting and stopping under load), and the same 11 kW at 400 V under AC-2 duty (slip-ring motors or resistive-inductive loads). The 24 VDC coil draws 4.2 W to close and holds at 4.2 W — a constant-hold design that simplifies the control transformer sizing because there's no inrush-to-hold drop. At 45 mm wide, it takes up one standard module slot on the rail. Depth is 101 mm — that's the dimension you need to clear the enclosure door or back panel. Height is 88 mm. Main circuit terminals are screw-type, accepting solid conductors from 2x (0.5 to 1.5 mm²) up to a maximum of 2x (0.75 to 4 mm²), or stranded 2x (1 to 2.5 mm²) up to 2x 10 mm² max. Auxiliary and control circuit terminals are also screw-type. Strip and torque per standard panel practice — these aren't spring-cage, so a screwdriver and a torque driver are part of the install. That's a practical difference: if you're designing for minimal downtime after a short circuit, the 35 A fuse limit governs your branch protection choice. The contactor includes an integrated varistor surge suppressor across the coil, so you don't need to add an external RC snubber or diode for DC coil suppression. Pollution degree 3 (conductive pollution) means it's rated for the typical industrial control panel environment without conformal coating. ## Thermal and life considerations","metaTitle":"Siemens 3RT1026-1KB40-1AA0 SIRIUS Power Contactor, 24 VDC, 1","metaDescription":"Siemens SIRIUS 3RT1026-1KB40-1AA0 power contactor, size S0, 24 VDC coil, 11 kW at 400 V AC-3. Current production. Screw terminals, varistor suppressor. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"45 mm","Height":"88 mm","At The Side":"6 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.7","Mounting Type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Full-Scale Value":"1.25","Size Of Contactor":"S0","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 400 V rated value":"11 kW","at 500 V rated value":"11 kW","at 690 V rated value":"11 kW","Instantaneous Contact":"0","For Main Current Circuit":"screw-type terminals","Single Or Multi-Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","at AC-2 at 400 V rated value":"11 kW","at AC-4 at 400 V rated value":"15.5 A","Design Of The Surge Suppressor":"with varistor","For Auxiliary And Control Circuit":"screw-type 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","operating current at AC-12 maximum":"10 A","at AWG conductors for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","With Type Of Coordination 1 Required":"fuse gL/gG: 100 A","reference code acc. to DIN EN 81346-2":"Q","Fastening Method Side-By-Side Mounting":"Yes","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","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)","at ambient temperature 40 °C rated value":"40 A","Type Of Voltage Of The Control Supply Voltage":"DC","operating current at AC-15 at 400 V rated value":"3 A","operational current at AC-15 at 230 V rated value":"6 A","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","type of connectable conductor cross-sections at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12"}},"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=375704&mlfb=3RT1026-1KB40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1KB40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of this contactor?","answer":"The depth is 101 mm. This is the dimension from the DIN rail mounting surface to the front of the contactor, important for enclosure depth clearance."},{"question":"What conductor sizes fit the main terminals?","answer":"The main screw terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and max 2x (0.75 to 4 mm²). For stranded: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), and max 2x 10 mm². AWG equivalents are 2x (16 to 12), 2x (14 to 10), and 1x 8."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-1KB40-1AA0","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/3RT1026-1KB40-1AA0 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}}