{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-1BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-1BF40","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-1BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 110 VDC coil, screw terminals, 11 kW rated motor power at 400 V AC-2, 45 mm width, active lifecycle.","salesMarkdown":"The 110 VDC coil pulls in at 5.4 W and holds at the same power, so the coil drive circuit needs to supply that continuously — no power-save circuit inside this model. Rated motor power hits 11 kW at 400 V in AC-2 duty (slip-ring motors, moderate overloads) and the same 11 kW at 500 V and 690 V, which covers most European-standard motor ratings up to that frame. General-use switching (AC-12) is rated at 10 A maximum, so it can handle resistive or lightly inductive control loads up to that current. The auxiliary contact block is configured as 0 instantaneous contacts — this is a main-pole-only contactor; add a separate auxiliary block if you need N/O or N/C feedback to the PLC. Main circuit terminals are screw-type, accepting solid conductors from 2x 0.5 mm² up to max 2x 4 mm², and stranded from 2x 1 mm² up to max 2x 10 mm² (AWG equivalents: 2x 16-12 solid, 2x 14-10 stranded, 1x 8). Strip length and torque are standard for S0 screw terminals — no special tooling needed. Front face carries an IP20 rating — safe for finger-probe access in an enclosure. The terminal area itself is IP00, so the contactor must live inside a panel that provides the overall IP rating. ## Short-circuit coordination and protection Sizing the fuse to Type 2 keeps the contactor reusable after a fault — worth specifying if the panel is hard to access for replacement. The auxiliary contact rating table covers DC switching at 24 V (10 A), 60 V (2 A), 110 V (1 A), and 220 V (0.3 A), plus AC at 230 V (6 A) and 400 V (3 A).","metaTitle":"Siemens 3RT1026-1BF40 SIRIUS Power Contactor, S0, 110 VDC Co","metaDescription":"Siemens SIRIUS 3RT1026-1BF40 power contactor, size S0, 110 VDC coil, 11 kW AC-2 at 400 V, 45 mm wide, screw terminals. Active lifecycle, 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":"85 mm","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"110 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":"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","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=452979&mlfb=3RT1026-1BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BF40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — 3RT1023-1AL20?","answer":"The 3RT1023-1AL20 is a different coil voltage (230 VAC) and a different frame size (S00 vs S0). It will not physically drop into a panel wired for the S0 frame without changing the DIN rail footprint and rewiring the coil circuit. The 3RT1026-1BF40 is the correct S0-frame, 110 VDC coil variant."},{"question":"What are the key dimensions for panel layout?","answer":"Width 45 mm, height 85 mm, depth 101 mm. Side-by-side mounting requires no gap. Maximum operating altitude is 2 000 m without derating."},{"question":"What conductor sizes does the screw terminal accept?","answer":"Solid: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm². AWG equivalents: 2x 16-12 solid, 2x 14-10 stranded, 1x 8."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-1BF40","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/3RT1026-1BF40 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}}