{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-3KB44-0LA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-3KB44-0LA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-3KB44-0LA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KB44-0LA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1026-3KB44-0LA0, 24 VDC coil, screw-type main terminals, spring-loaded auxiliary terminals, 11 kW at 400 V AC-3.","salesMarkdown":"The Siemens SIRIUS 3RT1026-3KB44-0LA0 is a size S0 power contactor rated for 11 kW at 400 V in AC-3 duty, making it a fit for switching three-phase motor loads up to that power level on standard 400 V networks. The 24 VDC coil draws 23 W on pickup and holds at 7 W, which matters for DC-supply sizing in a panel — the inrush isn't trivial, so factor it into your 24 V bus budget. ## Terminals and wiring Main power circuit lands on screw-type terminals accepting 2x (1... 2.5 mm²), 2x (2.5... 6 mm²), or max. 2x 10 mm² stranded — covers common motor cable sizes up to about 8 AWG. The auxiliary and control circuit uses spring-loaded terminals rated for 2x (0.25... 2.5 mm²) solid or 2x (24... 14) AWG. That split (screw for power, spring for control) is a practical choice: power wires get a positive clamp you can torque, control wires snap in fast during commissioning. IP20 on the front, IP00 at the terminals — keep live parts behind a panel door or cover. That's the spec to hand your panel-builder when they size the branch circuit. The built-in varistor surge suppressor clips coil-induced spikes — no external snubber needed on the 24 VDC control line.","metaTitle":"3RT1026-3KB44-0LA0 SIRIUS S0 power contactor, 24 VDC, screw","metaDescription":"Siemens SIRIUS 3RT1026-3KB44-0LA0 power contactor, size S0, 24 VDC coil, screw main terminals, spring aux terminals, 11 kW at 400 V AC-3. Current lifecycle. Quoted to order.","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","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.7","Of The Terminal":"IP00","lifecycle_stage":"current","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.25","Size Of Contactor":"S0","Solid Or Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","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","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"11 kW","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 35 A","closing power of magnet coil at DC":"23 W","holding power of magnet coil at DC":"7 W","reference code acc. to IEC 81346-2":"Q","Ambient Temperature During Operation":"-40 ... +70 °C","With Type Of Coordination 1 Required":"fuse gL/gG: 100 A","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","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","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"2","Of The Contactor With Added Electronically Optimized 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=248658&mlfb=3RT1026-3KB44-0LA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3KB44-0LA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT1026-3KB44-0LA0?","answer":"The closest functional peer is the 3RT1026-1AB00, which shares the same S0 frame size and AC-3 power rating but uses screw-type terminals for both main and auxiliary circuits instead of the spring-loaded aux terminals on this variant. The 3RT1026-3KB44-0LA0 also includes a built-in varistor surge suppressor; the -1AB00 does not. Panel fit (footprint, DIN-rail mounting, side-by-side spacing) is identical, so a swap is possible if you account for the terminal style and external snubber."},{"question":"Where can I buy 3RT1026-3KB44-0LA0?","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 3RT1026-3KB44-0LA0?","answer":"The part carries a substance prohibition date of 01.07.2006, indicating RoHS compliance per the EU directive. As a SIRIUS-series contactor, Siemens typically provides CE, UL, CSA, and IEC declarations on request through their documentation portal. The reference code per IEC 81346-2 is Q."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-3KB44-0LA0","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/3RT1026-3KB44-0LA0 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}}