{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-1AL28-0QA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-1AL28-0QA2","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-1AL28-0QA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1AL28-0QA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1026-1AL28-0QA2, Size S0 power contactor, 3 NO main contacts, screw terminals, 11 kW at 500/690 V AC, AC-2/AC-4 rated.","salesMarkdown":"This contactor carries 11 kW ratings at both 500 V and 690 V under AC-2 duty, and an AC-4 current rating of 15.5 A at 400 V. The AC-2 rating covers wound-rotor motors and slip-ring applications; the AC-4 rating handles inching, plugging, and reversing — the high-stress cycles that generate arcing across the main contacts. Three instantaneous main contacts (3 NO) handle the power circuit, and the contactor is built for 10 million typical mechanical cycles. That mechanical life is what you expect from a S0-frame SIRIUS unit — it's not a light-duty relay, it's meant for daily switching in a production line. The 11 kW AC-2 rating at 500 V and 690 V tells you this contactor is sized for medium-horsepower induction motors — think 15 HP at 460 V or 20 HP at 575 V, roughly. Front protection is IP20 (finger-safe), terminal area is IP00 (open). That's standard for panel-mount contactors — the IP20 front means an operator can touch the front of the installed unit without risk, but the wiring area needs to be inside a locked enclosure. Main circuit terminals are screw-type, accepting 2x (1 to 2.5 mm²) solid/stranded, 2x (2.5 to 6 mm²), or max 2x 10 mm² — also AWG equivalents 2x (16 to 12), 2x (14 to 10), 1x 8. Auxiliary contacts accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). That's generous for a Size S0; you can parallel two 4 mm² conductors per terminal for high-current feeds. For Type 2 coordination (no-weld after fault), the manufacturer specifies a gL/gG fuse of 35 A. For Type 1 coordination (welding allowed, but no fire risk), the fuse goes up to 100 A gL/gG. If you're designing to IEC 60947-4-1, the 35 A fuse limit is the one that protects downstream equipment after a short circuit. Physical dimensions: 55 mm wide, 85 mm high, 140 mm deep. The 55 mm width is the key panel-space number — it occupies three 18 mm module positions on a DIN rail, which is standard for S0 contactors. The auxiliary contact ratings span 10 A at 24 V, 6 A at 230 V, down to 0.3 A at 220 V DC. These are the values for the integrated auxiliary contacts — they cover typical PLC-level control signals and pilot duty circuits. The DC ratings are the limiting factor: at 220 V DC the contacts only handle 0.3 A, so verify your DC load before wiring. Above that, expect reduced dielectric strength and lower switching capacity — standard for industrial contactors per IEC 60947.","metaTitle":"Siemens 3RT1026-1AL28-0QA2 SIRIUS Power Contactor, Size S0,","metaDescription":"Siemens SIRIUS 3RT1026-1AL28-0QA2 power contactor, Size S0, 11 kW at 500/690 V, AC-2/AC-4 rated, screw terminals, 3 NO contacts, current lifecycle stage. DIN rail mount.","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":"55 mm","Height":"85 mm","Maximum":"2 000 m","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","At The Side":"6 mm","On The Front":"IP20","1 Rated Value":"50 Hz","2 Rated Value":"60 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":"230 V","at 500 V rated value":"11 kW","at 60 Hz rated value":"230 V","at 690 V rated value":"11 kW","Instantaneous Contact":"3","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":"8.4 V·A","Apparent pick-up power of magnet coil at AC":"64 V·A","Type of voltage of the control supply voltage":"AC","Inductive power factor with closing power of the coil":"0.72","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=489913&mlfb=3RT1026-1AL28-0QA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1AL28-0QA2/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"11 kW at 500 V and 690 V under AC-2 duty, 15.5 A at 400 V under AC-4 duty. Three NO main contacts, screw terminals. Size S0 frame, 55 mm wide, fits 35 mm DIN rail."},{"question":"What wire sizes does the main circuit accept?","answer":"Screw terminals accept 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm² solid/stranded, with AWG equivalents 2x (16 to 12), 2x (14 to 10), 1x 8."},{"question":"What fuse coordination is required?","answer":"Type 2 coordination (no weld) requires a 35 A gL/gG fuse. Type 1 coordination (welding allowed) allows a 100 A gL/gG fuse."},{"question":"Can this contactor be mounted side-by-side with others?","answer":"Yes, side-by-side mounting is permitted without derating, which saves DIN rail space in dense panels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-1AL28-0QA2","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/3RT1026-1AL28-0QA2 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}}