{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2028-2CK64-3MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2028-2CK64-3MA0","canonicalUrl":"https://aoctrl.com/siemens/3RT2028-2CK64-3MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2028-2CK64-3MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, 3RT2028-2CK64-3MA0, size S0, 24 VDC coil, spring-type terminals, 45 mm width, 102 mm height, 144 mm depth.","salesMarkdown":"The 45 mm width and 102 mm height fit the standard S0 footprint on a 35 mm DIN rail per DIN EN 60715, with screw and snap-on mounting. No auxiliary switch is included — order separately if needed. The 24 VDC coil draws 6 A at rated value, which is the pickup current — the inrush is higher but brief. For DC switching at other voltages: 2 A at 48 V or 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 0.6 A at 440 V. These numbers govern the contactor's ability to break DC loads without excessive arcing. The arcing time is 10 ms at AC, consistent across 50 and 60 Hz operation. Operating cycles per hour: 1 000 in AC-1 (resistive), 750 in AC-2 and AC-3 (motor starting/running), 250 in AC-4 (plugging/inching). The AC-3e rating matches AC-3 at 750 cycles/h. For high-duty applications like frequent reversing, the AC-4 limit is the one to watch — exceeding it shortens service life. ## Wiring and panel integration Auxiliary circuits (if added) take 2x (0.5 to 2.5 mm²) solid or stranded. The coil uses spring-type terminals — strip length and ferrule sizing per Siemens recommendation. Required clearances: 10 mm upwards, downwards, and forwards; 6 mm at the side.","metaTitle":"Siemens 3RT2028-2CK64-3MA0 SIRIUS Power Contactor, S0, 24 VD","metaDescription":"Siemens SIRIUS 3RT2028-2CK64-3MA0 power contactor, size S0, 24 VDC coil, spring-type terminals, rated 6 A at 24 V. Active production, DIN-rail mount. Sourced to order.","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","at 60 Hz":"0.28","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 DIN 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":"5 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"34 A","at 50 Hz rated value":"110 V","at 500 V rated value":"2 A","at 60 Hz rated value":"120 V","at 600 V rated value":"27 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":"3 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"25 hp","at 575/600 V rated value":"25 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":"9.6 W","at AC-2 at 400 V rated value":"18.5 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"22 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","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":"44 A","at AC-5b up to 400 V rated value":"31.5 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)","Without Load Current Share Typical":"10.5 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)","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":"3.2 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":"593 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"341 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"260 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"199 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"162 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":"https://cdn.aoctrl.com/a121230d9fdc810c26868c8270deb4f9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=223442&mlfb=3RT2028-2CK64-3MA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2028-2CK64-3MA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to this contactor?","answer":"The 3RT2028-2AP00-ZX95 is a functional peer in the same SIRIUS S0 frame size. Check coil voltage and terminal type — the -2CK64-3MA0 has a 24 VDC coil and spring terminals; the -2AP00-ZX95 may differ. Both share the same DIN-rail footprint and main contact ratings."},{"question":"What are the main dimensions of this contactor?","answer":"Width 45 mm, height 102 mm, depth 144 mm. It occupies the standard S0 footprint on 35 mm DIN rail."},{"question":"What wire sizes does the main contact accept?","answer":"Solid or stranded conductors from 1 to 10 mm². For auxiliary circuits, use 2x (0.5 to 2.5 mm²)."},{"question":"Will this contactor drop into a panel designed for the 3RT2028-2AP00-ZX95?","answer":"Yes — both are size S0, same 45 mm width and DIN-rail mounting. The coil voltage and terminal type must match: this unit has a 24 VDC coil with spring terminals. If the panel was wired for a different coil voltage or screw terminals, adaptation is needed."},{"question":"What compliance documentation is available for this part?","answer":"As a Siemens SIRIUS product, it carries CE marking and is designed to IEC/EN 60947-4-1. RoHS and REACH declarations are standard from Siemens. No UL or CSA listing is confirmed in the record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2028-2CK64-3MA0","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/3RT2028-2CK64-3MA0 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}}