{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-1BD40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-1BD40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-1BD40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BD40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT1026-1BD40-1AA0, 11 kW at 400 V AC-2, screw-type terminals, 45 mm width, snap-on DIN rail mounting.","salesMarkdown":"## Siemens SIRIUS 3RT1026-1BD40-1AA0 — Power Contactor, Size S0 The Siemens SIRIUS 3RT1026-1BD40-1AA0 is a size S0 power contactor rated for motor switching at 11 kW in AC-2 duty at 400 V, and the same 11 kW at both 500 V and 690 V — meaning it handles the same motor load across standard European supply voltages without derating the power rating. The AC-2 rating of 11 kW at 400 V is the key figure for slip-ring motor duty — AC-2 covers starting and plugging of wound-rotor motors, where the contactor sees higher switching frequency than a standard AC-3 squirrel-cage start. For AC-4 reversing or inching duty, the contactor is rated 15.5 A at 400 V. In AC-12 (resistive) service, the maximum operating current is 10 A, suitable for switching heater banks or transformer primaries within that limit. ## Wiring and Terminal Data Main current circuit terminals are screw-type, accepting 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm² stranded — or 2x (16 to 12), 2x (14 to 10), 1x 8 AWG. Auxiliary contact terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid. ## Environmental and Mounting Conditions Front of the device carries IP20 protection (finger-safe), while the terminals themselves are rated IP00 — meaning the wiring area is not touch-safe without the panel enclosure providing the final protection.","metaTitle":"Siemens 3RT1026-1BD40-1AA0 SIRIUS Power Contactor, S0, 11 kW","metaDescription":"Siemens SIRIUS power contactor 3RT1026-1BD40-1AA0, size S0, 11 kW at 400 V AC-2, screw terminals, 45 mm wide, current production. Quoted to order against RFQ.","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":"42 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=502373&mlfb=3RT1026-1BD40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BD40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of the 3RT1026-1BD40-1AA0?","answer":"It is rated 11 kW at 400 V AC-2, 11 kW at 500 V, 11 kW at 690 V, 15.5 A at 400 V AC-4, and 10 A AC-12 resistive. Coil power is 5.4 W DC for both closing and holding."},{"question":"Where can I buy 3RT1026-1BD40-1AA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 3RT1026-1BD40-1AA0?","answer":"The reference code per DIN EN 81346-2 is Q (power switching device). Standard Siemens SIRIUS documentation includes RoHS and REACH declarations; UL and IEC certifications are typically available on the manufacturer's support portal for this series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-1BD40-1AA0","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/3RT1026-1BD40-1AA0 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}}