{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-1AU04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-1AU04","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-1AU04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1AU04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3 NO main contacts, 11 kW at 400 V AC-2/AC-3, screw terminals, 45 mm wide, DIN-rail snap-on mounting.","salesMarkdown":"## SIRIUS 3RT1026-1AU04 — size S0 power contactor for motor loads The Siemens 3RT1026-1AU04 is a SIRIUS power contactor in the compact S0 frame, rated for 11 kW at 400 V in AC-2 and AC-3 duty — the standard motor-switching curve for pumps, fans, and compressors on a 400 V three-phase line. Three NO main contacts handle the power path; screw-type terminals on the main circuit accept up to 2x 10 mm² or 1x AWG 8, which covers the feed for a 22–25 A motor circuit without a separate terminal block. The 45 mm width leaves room for a reversing pair or a star-delta cluster in a 600 mm enclosure. ## Motor duty and coordination At 400 V AC-3 (the common motor-start rating), the contactor switches 11 kW — a 22 A full-load current on a typical 4-pole induction motor. For reversing or plugging duty (AC-4), the rated operational current is 15.5 A at 400 V; that lower figure reflects the increased arc wear from frequent inching or reversing. If the circuit requires type 2 coordination (no weld after a fault), the upstream fuse is gL/gG 35 A; for type 1 coordination (device may be damaged but no fire risk), the fuse can go to 100 A. That gives the panel designer a clear selectivity window. The contactor also carries ratings at 500 V and 690 V — both 11 kW — which is useful for 480 V North American or 690 V European mining/industrial feeds. At 690 V the same power means a lower line current, so the contactor runs cooler in that application. ## Auxiliary contact capacity and coil data The built-in auxiliary contact block (1 NO + 1 NC, instantaneous) handles control-circuit switching across a wide voltage range: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V DC. That covers PLC output cards, relay interfaces, and pilot devices without an add-on block for most simple interlocking. For higher auxiliary current needs, a separate SIRIUS auxiliary contact block snaps onto the front. The 85 mm height and 140 mm depth fit standard 200 mm deep enclosures with clearance for wiring ducts. Side-by-side mounting is permitted with zero spacing, so a multi-contactor group packs tightly on the rail — useful for star-delta or reversing starters. The 6 mm clearance to adjacent devices on the front is the minimum for air circulation and arc flash containment. Wire termination: main circuit accepts 2x (1–2.5 mm²) or 2x (2.5–6 mm²) stranded, up to 2x 10 mm² maximum. The auxiliary circuit uses smaller terminals: 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²), max 2x (0.75–4 mm²). Use ferruled stranded for reliable clamping in the screw terminals.","metaTitle":"Siemens 3RT1026-1AU04 SIRIUS Power Contactor, 11 kW at 400 V","metaDescription":"Siemens SIRIUS 3RT1026-1AU04 power contactor, size S0, 3 NO main contacts, 11 kW at 400 V AC-2/AC-3. Current production. Screw terminals, DIN-rail mount. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"140 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"45 mm","Height":"85 mm","Maximum":"2 000 m","at 50 Hz":"0.8 ... 1.1","At The Side":"6 mm","On The Front":"IP20","1 Rated Value":"50 Hz","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","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 50 Hz rated value":"240 V","at 500 V rated value":"11 kW","at 690 V rated value":"11 kW","Instantaneous Contact":"2","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","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","at ambient temperature 40 °C rated value":"40 A","Apparent holding power of magnet coil at AC":"7.8 V·A","Apparent pick-up power of magnet coil at AC":"61 V·A","Type of voltage of the control supply voltage":"AC","Inductive power factor with closing power of the coil":"0.82","Inductive power factor with the holding power of the coil":"0.24","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Of The Contactor With Added Electronics-Compatible Auxiliary Switch Block Typical":"5 000 000"}},"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=109940&mlfb=3RT1026-1AU04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1AU04/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RT1026-1AU04?","answer":"The contactor carries the standard SIRIUS compliance package: CE marking for the European low-voltage directive, RoHS and REACH declarations, and UL/CSA recognition for North American installations. Specific certificate numbers are available on request at quote time."},{"question":"Where can I buy 3RT1026-1AU04 and how is it quoted?","answer":"The 3RT1026-1AU04 is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-1AU04","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/3RT1026-1AU04 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}}