{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-3BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-3BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-3BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1026-3BW40, size S0, screw-type terminals, 11 kW rated motor power at 690 V AC-3, 15.5 A AC-4 at 400 V, IP20 front, DIN-rail mount.","salesMarkdown":"## Contactor selection memo The Siemens SIRIUS 3RT1026-3BW40 is a size S0 power contactor rated for motor switching at 11 kW on 500 V AC-3 and also 11 kW on 690 V AC-3 — same power at both voltages, meaning the current draw drops as line voltage rises, so the contactor is current-limited at the lower voltage. For reversing or plugging duty (AC-4), it handles 15.5 A at 400 V. The coil is DC-operated, with a constant 5.4 W closing and holding power — no AC hum, and the coil driver sees a steady load regardless of line frequency. ## Short-circuit coordination For type 1 coordination (contactor may need replacement after a fault, but the panel is safe), the fuse can go up to 100 A. This matters for selectivity studies — the upstream breaker must coordinate with the chosen fuse rating to clear the fault before the contactor welds. ## Termination and wiring Main current circuit terminals are screw-type, accepting solid or stranded conductors: 2x (0.25–2.5 mm²), 2x (1–2.5 mm²), 2x (2.5–6 mm²), or up to 2x 10 mm². AWG equivalents: 2x (16–12), 2x (14–10), or 1x 8. ## Environmental limits Maximum installation altitude 2 000 m without derating.","metaTitle":"Siemens 3RT1026-3BW40 SIRIUS Power Contactor, S0, 11 kW at 6","metaDescription":"Siemens 3RT1026-3BW40 SIRIUS power contactor, size S0, screw terminals, 11 kW AC-3 at 690 V, 15.5 A AC-4 at 400 V. Active production. IP20 front. DIN-rail mount. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"85 mm","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"48 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 (0.25 ... 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","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=282433&mlfb=3RT1026-3BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3BW40/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of this contactor?","answer":"The depth is 100 mm."},{"question":"What conductor sizes does the solid terminal accept?","answer":"The solid (stranded) terminal accepts 2x (0.25–2.5 mm²) as the smallest range, and up to 2x 10 mm² maximum."},{"question":"Will it fit a panel designed for 3RT1023-1AL20 without rewiring?","answer":"No — the 3RT1026-3BW40 is size S0 (45 mm wide), while the 3RT1023-1AL20 is a smaller frame. The DIN-rail mounting hole pattern and terminal spacing differ. Rewiring and possibly a new DIN-rail section are required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-3BW40","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/3RT1026-3BW40 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}}