{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-1BB44-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-1BB44-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-1BB44-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BB44-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1026-1BB44-1AA0, 24 VDC coil, 11 kW rated at 400 V AC-3, screw terminals, snap-on DIN rail mount.","salesMarkdown":"The Siemens 3RT1026-1BB44-1AA0 is a SIRIUS S0-frame power contactor rated for 11 kW at 400 V in AC-3 duty and the same 11 kW at 690 V, making it a fit for three-phase motor loads up to that power class across standard European supply voltages. The coil is 24 VDC, drawing 5.4 W on pickup and 5.4 W holding — a constant-hold design that simplifies the DC supply sizing since there is no dropout between seal-in and hold. ## Motor switching and coordination Beyond the AC-3 motor rating, the contactor is rated for AC-4 duty at 15.5 A at 400 V — the category for plugging and inching where the contacts make and break stalled-rotor currents. AC-2 at 400 V also carries 11 kW, covering slip-ring motor starting. Short-circuit coordination is specified: type 1 coordination requires a 100 A gL/gG fuse; type 2 coordination requires a 35 A gL/gG fuse. This lets the panel designer choose between simpler replacement after a fault (type 1) or minimal contact damage (type 2) depending on the line's uptime requirements. ## Auxiliary contact block and coil data The contactor carries 2 instantaneous auxiliary contacts (NO/NC configuration not specified in the base code — the 1AA0 suffix typically indicates a specific auxiliary block variant; verify the contact arrangement against your schematic). The coil's DC switching capacity is rated at 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are the maximum currents the auxiliary contacts can switch in DC control circuits, which matters when driving PLC outputs or relay loads. Terminals accept solid or stranded conductors: main circuit terminals take 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm²; auxiliary circuit terminals take 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). AWG equivalents are 2x (16 to 12), 2x (14 to 10), and 1x 8 for the main circuit. The screw-type terminals are standard for panel wiring. The active lifecycle means no special surplus-channel search is needed — it is a straightforward BOM line item.","metaTitle":"Siemens 3RT1026-1BB44-1AA0 SIRIUS S0 Power Contactor, 24 VDC","metaDescription":"Siemens 3RT1026-1BB44-1AA0 SIRIUS S0 power contactor. 11 kW at 400 V AC-3, 24 VDC coil. Current lifecycle stage. Available to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"150 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 The Side":"6 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.8","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":"1.1","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":"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","Closing power of magnet coil at DC":"5.4 W","Holding power of magnet coil at DC":"5.4 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 (0.5 ... 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","Type of voltage of the control supply voltage":"DC","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=536426&mlfb=3RT1026-1BB44-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BB44-1AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1026-1BB44-1AA0 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional alternative to 3RT1026-1BB44-1AA0?","answer":"The closest functional peer within the SIRIUS S0 family is the 3RT1023-1AL20, which shares the same S0 frame size and DIN-rail mounting but differs in coil voltage and power rating. The 3RT1026-1BB44-1AA0 carries a 24 VDC coil and 11 kW at 400 V AC-3; the 3RT1023-1AL20 uses a different coil voltage and lower power rating. Verify your coil voltage and motor kW before substituting."},{"question":"What is the depth of 3RT1026-1BB44-1AA0?","answer":"The depth is 150 mm, with a width of 45 mm and height of 85 mm — the S0 frame dimensions."},{"question":"What conductor sizes does the 3RT1026-1BB44-1AA0 accept?","answer":"Main circuit terminals accept 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm² solid/stranded. Auxiliary terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). AWG equivalents: main 2x (16 to 12), 2x (14 to 10), 1x 8."},{"question":"Will 3RT1026-1BB44-1AA0 drop into a panel specified for 3RT1023-1AL20?","answer":"Both are S0-frame contactors with the same 45 mm width and DIN-rail snap-on mounting, so the physical footprint is identical. The difference is coil voltage and power rating — verify your control voltage and motor load match the 24 VDC coil and 11 kW rating of the 3RT1026-1BB44-1AA0 before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-1BB44-1AA0","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/3RT1026-1BB44-1AA0 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}}