{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2026-2AF04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2026-2AF04","canonicalUrl":"https://aoctrl.com/siemens/3RT2026-2AF04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2026-2AF04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2026-2AF04 power contactor, S0 frame, 480 V rated value 21 A, spring-type coil terminals, screw and snap-on mounting.","salesMarkdown":"These figures define its capability for motor starting (AC-3 duty) and resistive heating (AC-1) applications. The 480 V 21 A rating means it can interrupt a motor circuit at that voltage and current within its thermal limits — a key parameter for panel builders coordinating with upstream protection. The main contacts also accept 2x (0.5 to 2.5 mm²) fine-stranded wire. This range covers typical control panel wiring from 14 AWG to 8 AWG, so it fits standard motor branch circuits without special lugs. Dimensions are 102 mm high, 45 mm wide, and 144 mm deep — the S0 frame footprint. These are the minimum air gaps needed around the contactor for heat dissipation and arc flash containment; a panel layout that respects these keeps the contactor within its thermal design. The storage range exceeds the operating range because it covers shipping and warehousing conditions — the contactor is not expected to switch loads at -55 °C. This allows installation in tight enclosures where the DIN rail is not perfectly vertical. Switching frequency limits vary by duty: 1,000 cycles/hour at AC-1 maximum, 750 cycles/hour at AC-2 and AC-3 maximum, 250 cycles/hour at AC-4 maximum, and 750 cycles/hour at AC-3e maximum. For a motor starter application (AC-3), 750 cycles/hour means roughly one start every 4.8 seconds — adequate for most conveyor and pump cycling, but not for high-speed indexing. ## Switching capacity across voltages The contactor's rated switching capacity is specified at multiple voltages for DC and AC applications. At 48 V it handles 2 A, at 60 V also 2 A, at 110 V it handles 1 A, at 125 V it handles 0.9 A, at 220 V it handles 0.3 A, at 230 V it is rated at 3 hp, at 400 V it handles 3 A, and at 440 V it handles 0.6 A. These values are for the main contacts and reflect the contactor's ability to interrupt DC arcs, which are harder to extinguish than AC arcs. The 3 hp rating at 230 V is a motor horsepower rating — a standard way to specify contactor size for North American motor circuits. Arcing time is specified at 10 to 10 ms, and at AC (50 Hz) it is 0.25 ms. The 10 ms figure is the typical arc duration during contact opening; the 0.25 ms at 50 Hz is the time for the arc to extinguish at a current zero crossing. This is within normal range for a contactor of this class — fast enough to limit contact erosion but not so fast that it requires special snubber circuits. The contactor has no auxiliary switch built in — the auxiliary switch field is marked 'No'. If your application requires auxiliary contacts for status feedback or interlocking, you will need to add a separate auxiliary contact block that mounts on the contactor's side or front. This is typical for the S0 frame; Siemens offers add-on blocks that clip onto the contactor without additional wiring space.","metaTitle":"Siemens 3RT2026-2AF04 SIRIUS Power Contactor, S0 Frame, 480V","metaDescription":"Siemens 3RT2026-2AF04 SIRIUS power contactor, S0 frame size, 480 V rated at 21 A. Spring-type coil terminals. Screw and snap-on DIN rail mounting. Current production status.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"144 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at AC":"4 ... 16 ms","Height":"102 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","at 50 Hz":"0.25","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","Auxiliary Switch":"No","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715","at AC-3e maximum":"750 1/h","For Main Contacts":"18 ... 8","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S0","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"6 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"3 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"21 A","at 50 Hz rated value":"110 V","at 500 V rated value":"2 A","at 600 V rated value":"22 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"2 hp","at 200/208 V rated value":"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","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"5.7 W","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"15.5 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","at AWG cables for main contacts":"2x (18 ... 8)","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"35.2 A","at AC-5b up to 400 V rated value":"20.7 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 35A (690V, 100kA), aM: 20A (690V, 100kA), BS88: 35A (415V, 80kA)","Without Load Current Share Typical":"9.8 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 100 A (690 V, 100 kA), aM: 50 A (690 V, 100 kA), BS88: 100 A (415 V, 80 kA)","at AWG cables for auxiliary contacts":"2x (20 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"1.9 W","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 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)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC","Limited To 1 S Switching At Zero Current Maximum":"375 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"299 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"200 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"128 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"106 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / Q600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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":"gG: 10 A (500 V, 1 kA)","minimum cross-section in main circuit at maximum AC-1 rated value":"10 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"2","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=255833&mlfb=3RT2026-2AF04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2026-2AF04/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"The contactor measures 102 mm high, 45 mm wide, and 144 mm deep. Minimum clearances: 10 mm up, down, and forward; 6 mm at the side."},{"question":"What wire sizes does the 3RT2026-2AF04 accept?","answer":"Main contacts accept solid or stranded wire from 1 to 10 mm², and 2x (0.5 to 2.5 mm²) fine-stranded. Coil terminals are spring-type."},{"question":"Does this contactor include auxiliary contacts?","answer":"No, the auxiliary switch is not included. An add-on auxiliary contact block is required for status feedback or interlocking."},{"question":"What is the switching capacity at 480 V?","answer":"At 480 V rated value, the contactor handles 21 A. At 24 V it handles 6 A, and at 230 V it is rated at 3 hp for motor loads."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2026-2AF04","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/3RT2026-2AF04 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}}