{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-3KB44-1LA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-3KB44-1LA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-3KB44-1LA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KB44-1LA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1026-3KB44-1LA0 power contactor, size S0, 24 VDC coil with varistor, 11 kW at 400 V AC-3, screw terminals, IP20 front.","salesMarkdown":"The Siemens SIRIUS 3RT1026-3KB44-1LA0 is a size S0 power contactor rated for motor switching at 11 kW in AC-3 duty at 400 V and also 11 kW at 690 V, making it a single part for 400 V and 690 V motor circuits up to that load. The 24 VDC magnet coil draws 23 W on pickup and holds at 7 W, with an operating range of 0.7 to 1.25 times rated voltage — so it picks up reliably at 16.8 V and won't drop out until below that threshold. Built-in varistor surge suppression across the coil means you don't need an external RC snubber for inductive kickback; just watch polarity on the DC coil wiring. Snap it onto 35 mm DIN rail per EN 50022 or screw-mount — the S0 frame is compact at 70 mm wide, 88 mm tall, and 153 mm deep, so it fits standard panel layouts without crowding adjacent devices. Side-by-side mounting is allowed with no derating, but if you need full rated current in a hot cabinet, leave 6 mm side clearance for airflow. ## Motor duty and coordination This contactor is rated for AC-3 (cage motor starting) at 11 kW / 400 V and the same 11 kW at 690 V — so it handles standard 400 V motors and 690 V motors of the same power without upsizing. For AC-4 reversing or plugging duty, the rating drops to 15.5 A at 400 V, which is the figure to use for frequent inching or reversing applications. AC-2 (slip-ring motor) rating is also 11 kW at 400 V. For short-circuit coordination, Type 1 requires a 100 A gL/gG fuse; Type 2 (limited damage to the contactor) needs a 35 A gL/gG fuse. The main circuit terminals are screw-type accepting 2x (0.25 to 2.5 mm²) solid or 2x (1 to 6 mm²) stranded, with a maximum of 2x 10 mm² or 1x 8 AWG — enough for the motor leads on this size. ## Auxiliary contacts and environmental ratings Two instantaneous auxiliary contacts are built in, rated for 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — covering typical PLC and relay interface voltages.","metaTitle":"Siemens 3RT1026-3KB44-1LA0 SIRIUS Power Contactor, S0, 24 VD","metaDescription":"Siemens SIRIUS 3RT1026-3KB44-1LA0 power contactor, size S0, 24 VDC coil, 11 kW motor rating at 400 V AC-3. Current production. Screw terminals, varistor suppression. Sourced to ord","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"153 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"70 mm","Height":"88 mm","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.7","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":"-40 ... +70 °C","Full-scale value":"1.25","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","Design of the surge suppressor":"with varistor","Closing power of magnet coil at DC":"23 W","Holding power of magnet coil at DC":"7 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=459283&mlfb=3RT1026-3KB44-1LA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KB44-1LA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of 3RT1026-3KB44-1LA0?","answer":"Width is 70 mm, height is 88 mm, and depth is 153 mm. It mounts on 35 mm DIN rail per EN 50022 or can be screw-mounted."},{"question":"Will 3RT1026-3KB44-1LA0 drop into a panel specified around 3RT1015-1BB42?","answer":"No — the 3RT1015-1BB42 is a size S00 frame (45 mm wide), while this S0 frame is 70 mm wide. The footprint, terminal spacing, and mounting hole pattern differ, so panel rework would be required. The coil voltage and auxiliary contact arrangement should be verified separately."},{"question":"What compliance documentation is available for this contactor?","answer":"As a Siemens SIRIUS product, it carries CE marking for the European market and UL/CSA certification for North America. RoHS and REACH compliance declarations are standard from Siemens. The IP20 front protection and pollution degree 3 rating are per IEC/EN 60947-4-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-3KB44-1LA0","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/3RT1026-3KB44-1LA0 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}}