{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1026-3XB40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1026-3XB40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT1026-3XB40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3XB40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, size S0, 24 V DC coil, screw terminals, 15 hp at 460/480 V, AC-4 15.5 A at 400 V, DIN rail mount.","salesMarkdown":"For motor duty, the contactor is rated 15 hp at 460/480 V and 20 hp at 575/600 V. The 24 V DC coil draws a holding current determined by the contactor's magnetic circuit; the pickup voltage threshold is 0.7 times the rated value, meaning the coil must see at least about 16.8 V DC to pull in reliably. Dropout typically occurs below 0.1 to 0.2 times rated, so a saggy 24 V bus won't cause nuisance dropouts unless it collapses below roughly 4 V. Auxiliary contact ratings are given for DC switching: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V. These are the DC-13 inductive load limits — useful for pilot duty on PLC inputs or relay coils in the same panel. The impulse withstand voltage of the main circuit is 6 kV, which covers typical 400 V distribution systems with overvoltage category III. The contactor is rated for operation up to 2,000 m altitude without derating. The 45 mm width (size S0) fits a standard 45 mm DIN-rail slot. Depth is 100 mm, height 119 mm — verify clearance to the gland plate or enclosure door. Screw terminals accept 2x (0.25...2.5 mm²) solid or stranded, 2x (1...2.5 mm²) and 2x (2.5...6 mm²), with a maximum of 2x 10 mm² per clamp. The contactor supports side-by-side mounting without derating, so multiple units can pack tightly on the rail.","metaTitle":"Siemens 3RT1026-3XB40-0LA2 SIRIUS Power Contactor, 24 V DC,","metaDescription":"Siemens SIRIUS 3RT1026-3XB40-0LA2 power contactor, size S0, 24 V DC coil, rated 15 hp at 460/480 V, AC-4 15.5 A at 400 V. Screw terminals, DIN rail mount. Current lifecycle stage.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"119 mm","Maximum":"2 000 m","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","At The Side":"10 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","Type of voltage":"DC","lifecycle_stage":"current","Full-scale value":"1.25","Size of contactor":"S0","Product brand name":"SIRIUS","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":"3 hp","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 110/120 V rated value":"2 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 hp","at 575/600 V rated value":"20 hp","Of Main Circuit Rated Value":"6 kV","at AC-4 at 400 V rated value":"15.5 A","Design of the surge suppressor":"with varistor","Of Auxiliary Circuit Rated Value":"6 kV","Function Module For Communication":"No","Closing power of magnet coil at DC":"6 W","Holding power of magnet coil at DC":"5.4 W","Operating current at AC-12 maximum":"10 A","Product function Bus communication":"No","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 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","Product function Short circuit protection":"No","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Number of NC contacts for auxiliary contacts":"2","Number of NO contacts for auxiliary contacts":"2","Type of voltage of the control supply voltage":"DC","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","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=399636&mlfb=3RT1026-3XB40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1026-3XB40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — 3RT1023-1AL20?","answer":"The 3RT1023-1AL20 is a smaller frame (S00 vs S0) with a 24 V AC coil, not DC. It will not drop into the same footprint without rewiring the coil supply and checking the terminal capacity. For a form-fit-function match, stay with the 3RT1026-3XB40-0LA2 or its direct S0 siblings with the same coil voltage."},{"question":"What are the key motor ratings?","answer":"Rated 15 hp at 460/480 V, 20 hp at 575/600 V, and 11 kW at 400 V or 690 V. AC-4 reversing duty is 15.5 A at 400 V."},{"question":"What compliance documentation is available?","answer":"The product carries CE marking for the European market. Specific UL/CSA or RoHS/REACH declarations are available through the Siemens Industry Online Support portal using this order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1026-3XB40-0LA2","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/3RT1026-3XB40-0LA2 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}}