{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-3KF44-1LA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-3KF44-1LA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-3KF44-1LA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KF44-1LA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, S0 frame, 3RT1026-3KF44-1LA0, 11 kW at 400 V AC-2, 15.5 A AC-4, 110 V DC coil with varistor, screw terminals, IP20 front.","salesMarkdown":"The 110 V DC coil with integrated varistor handles the suppression internally, so you don't need to add a separate RC snubber across the coil terminals. For motor starting duty (AC-2 at 400 V), this contactor is rated at 11 kW — that covers a standard 15 hp induction motor on a 400 V three-phase line. For reversing or plugging duty (AC-4 at 400 V), the rating drops to 15.5 A, reflecting the higher electrical wear from breaking locked-rotor currents. The mechanical endurance is typical 10 million cycles, so it's built for high-throughput conveyor or pump cycling applications. The contactor carries pollution degree 3, meaning it's rated for the conductive dust and humidity found in most industrial environments without conformal coating. Operating temperature range spans -40 to +70 °C, so it's suitable for unheated plant floors or outdoor cabinet installations as long as the enclosure keeps condensation off the terminals. ## Short-circuit coordination and wiring The main terminals are screw-type, accepting 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²) or up to 2x 10 mm² stranded copper. The S0 frame occupies 70 mm width, 88 mm height, and 153 mm depth — check your DIN rail clearance, especially if the contactor is mounted near the gland plate. Side-by-side mounting is allowed (zero spacing), so you can pack multiple units on the same rail without derating. The auxiliary contact block (2 instantaneous contacts) is built in; no separate add-on needed for basic signaling.","metaTitle":"Siemens 3RT1026-3KF44-1LA0 SIRIUS Power Contactor, 11 kW AC-","metaDescription":"Siemens SIRIUS 3RT1026-3KF44-1LA0 power contactor, S0 frame, 11 kW at 400 V AC-2, 15.5 A AC-4, 110 V DC coil, varistor suppressor, screw terminals, current lifecycle stage.","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":"110 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=216938&mlfb=3RT1026-3KF44-1LA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KF44-1LA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"It is rated 11 kW at 400 V for AC-2 motor starting duty, and 15.5 A at 400 V for AC-4 reversing or inching duty. The coil is 110 V DC with an integrated varistor surge suppressor."},{"question":"What short-circuit protection does this contactor require?","answer":"For Type 2 coordination, use a 35 A gL/gG fuse. For Type 1 coordination, a 100 A gL/gG fuse is permitted."},{"question":"What is the mechanical life expectancy of this contactor?","answer":"Typical mechanical endurance is 10 million operating cycles."},{"question":"Can this contactor be mounted side-by-side with others?","answer":"Yes, side-by-side mounting is permitted without spacing, allowing dense packing on a 35 mm DIN rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-3KF44-1LA0","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/3RT1026-3KF44-1LA0 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}}