{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-3KF40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-3KF40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-3KF40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KF40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT1026-3KF40-1AA0, 11 kW AC-2 at 400 V, 110 V AC coil with integrated varistor, screw terminals, DIN-rail mount.","salesMarkdown":"The Siemens SIRIUS 3RT1026-3KF40-1AA0 is a size S0 power contactor rated 11 kW in AC-2 duty at 400 V — that is the motor-switching curve for slip-ring or wound-rotor motors, where the contactor makes and breaks under full load. The AC-4 reversing rating is 15.5 A at 400 V, which governs plugging or inching applications where the contacts open under stalled-rotor current. The magnet coil is wound for 110 V AC and includes a built-in varistor surge suppressor, so no external RC snubber is needed across the coil terminals. ## Panel fit and wiring constraints The S0 footprint is 45 mm wide by 88 mm tall by 101 mm deep — a standard width that leaves room for a three-phase busbar system alongside. Main-circuit terminals are screw-type, accepting 2x (0.25 to 2.5 mm²) solid or 2x (1 to 2.5 mm²) stranded, with a maximum of 2x 10 mm² per terminal.","metaTitle":"Siemens 3RT1026-3KF40-1AA0 SIRIUS Power Contactor, 11 kW AC-","metaDescription":"Siemens SIRIUS 3RT1026-3KF40-1AA0 power contactor, size S0, 11 kW AC-2 at 400 V, 110 V AC coil with varistor. Current production, DIN-rail mount. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"88 mm","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"110 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 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","Instantaneous Contact":"0","Side-by-side mounting":"Yes","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","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","With Type Of Assignment 2 Required":"fuse gL/gG: 35 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","Number of NC contacts for main contacts":"0","Number of NO contacts for main contacts":"3","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (24 ... 14)","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"spring-loaded terminals","at ambient temperature 40 °C rated value":"40 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type of voltage of the control supply voltage":"DC","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A"}},"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=213966&mlfb=3RT1026-3KF40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KF40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"AC-2 duty at 400 V is 11 kW; AC-4 reversing duty at 400 V is 15.5 A. The AC-12 resistive maximum is 10 A."},{"question":"What is the depth of this contactor for cabinet planning?","answer":"The depth is 101 mm, which is the dimension from the DIN-rail mounting surface to the front of the arc chamber."},{"question":"What wire sizes do the screw terminals accept?","answer":"Main terminals accept 2x (0.25 to 2.5 mm²) solid, 2x (1 to 2.5 mm²) stranded, and up to 2x 10 mm² maximum."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-3KF40-1AA0","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/3RT1026-3KF40-1AA0 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}}