{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-1BB40-0UA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-1BB40-0UA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-1BB40-0UA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BB40-0UA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1026-1BB40-0UA0, 24 VDC coil, 11 kW at 400 V AC-2, 15.5 A at 400 V AC-4, screw terminals, IP20 front, DIN rail mount.","salesMarkdown":"The Siemens 3RT1026-1BB40-0UA0 is a SIRIUS S0-frame power contactor rated for 11 kW at 400 V in AC-2 duty — the category for slip-ring motor starting and reversing. That 11 kW at 400 V is the rating that governs the motor load it can handle; the AC-4 rating of 15.5 A at 400 V covers plugging and inching duty where the contactor makes and breaks the motor current at full load. ## Integration notes Screw-type terminals on the main circuit accept 2x (0.75... 4 mm²) solid or 2x (1... 2.5 mm²) stranded, with a maximum of 2x 10 mm². The auxiliary contact block at the front carries 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for a PLC input or a pilot light. That gives the panel builder flexibility — a 35 A fuse keeps the contactor reusable after a fault; a 100 A fuse saves panel space but accepts a sacrificial contactor. ## Environmental limits","metaTitle":"Siemens 3RT1026-1BB40-0UA0 SIRIUS S0 Power Contactor, 24 VDC","metaDescription":"Siemens SIRIUS 3RT1026-1BB40-0UA0 power contactor, S0 frame, 24 VDC coil, 11 kW at 400 V AC-2, 15.5 A at 400 V AC-4. Active production, DIN rail mount, IP20 front. 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":"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":"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":"$172.82","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=536456&mlfb=3RT1026-1BB40-0UA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-1BB40-0UA0/alternatives.json"},"ai":{"faq":[{"question":"What is the listed depth of this contactor?","answer":"The depth is 101 mm. Combined with the 45 mm width and 85 mm height, it fits the standard S0 panel cutout."},{"question":"What wire sizes does the main circuit accept?","answer":"Solid: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²). Stranded: 2x (1... 2.5 mm²), 2x (2.5... 6 mm²), max. 2x 10 mm². AWG equivalents are 2x (16... 12), 2x (14... 10), 1x 8."},{"question":"Will 3RT1026-1BB40-0UA0 drop into a panel specified around 3RT1015-1BB42 without rewiring?","answer":"No. The 3RT1026-1BB40-0UA0 is an S0 frame (45 mm wide) while the 3RT1015-1BB42 is an S00 frame (22.5 mm wide). The wider footprint means the DIN rail position and terminal locations differ, and the terminal wire ranges are not identical. Panel rework is required."},{"question":"What compliance documentation is available for this part?","answer":"The reference code per DIN EN 81346-2 is Q, which is the standard designation for switching devices. The part carries the SIRIUS brand and is designed for IEC/EN 60947-4-1 compliance as a power contactor. Specific RoHS/REACH/UL declarations should be requested with the RFQ, as they are not listed in the base spec."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-1BB40-0UA0","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/3RT1026-1BB40-0UA0 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}}