{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2028-1AN24","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2028-1AN24","canonicalUrl":"https://aoctrl.com/siemens/3RT2028-1AN24","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2028-1AN24","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2028-1AN24, Size S0, 24 VDC coil, screw-type terminals, 45 mm width, current production.","salesMarkdown":"The 24 VDC coil with screw-type terminals is the control interface, and the contactor itself has no built-in auxiliary switch — you add one externally if needed. The switching frequency depends on the duty class: up to 1,000 operations per hour at AC-1 (resistive), 750/h at AC-2 and AC-3 (motor starting/running), and 250/h at AC-4 (plugging/inching). The AC-3e rating also sits at 750/h. Auxiliary contact ratings are given per voltage: 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.6 A at 440 V. The motor horsepower rating is 5 hp at 230 V. These numbers define the maximum switching capacity for control circuits and small motor loads — stay within them to avoid contact welding. Mechanical life is typical 10,000,000 operations — that is the expected number of no-load cycles before the mechanism wears out. Electrical life will be lower and depends on the switched current and duty class. For the coil terminals, the spec allows 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded. The main contact terminal screw-type design accepts the full range. The arcing time is 10 ms at AC. The contactor is rated for 50/60 Hz operation with a 0.25 A / 0.28 A coil holding current respectively.","metaTitle":"Siemens 3RT2028-1AN24 SIRIUS Power Contactor, Size S0, 24 VD","metaDescription":"Siemens 3RT2028-1AN24 SIRIUS power contactor, Size S0, 24 VDC coil, screw terminals, 45 mm width, current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"141 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at AC":"4 ... 16 ms","title":"3RT2028-1AN24","Height":"85 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","description":"power contactor, AC-3e/AC-3, 38 A, 18.5 kW / 400 V, 3-pole, 220 V AC, 50/60 Hz, auxiliary contacts: 2 NO + 2 NC, screw terminal, size: S0, removable auxiliary switch","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-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":"16 ... 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 ... 1.5 mm²), 2x (0.75 ... 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":"220 V","at 500 V rated value":"2 A","at 60 Hz rated value":"220 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":"screw-type 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-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","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":"screw-type 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":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"3.2 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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), 2x (0.75 ... 2.5 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 %","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/863cda664078086b2551e4e098c57d39.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=82264&mlfb=3RT2028-1AN24"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT2028-1AN24?","answer":"The closest functional peer is 3RT2028-1AU00, which shares the same Size S0 frame and 24 VDC coil but uses a different coil terminal type (AU00 uses screw-type as well, but check the specific coil variant). The 3RT2028-1AN24 has screw-type coil terminals; the 1AU00 may differ in coil connection or auxiliary contact configuration. For a drop-in replacement without rewiring, verify the coil terminal arrangement and any auxiliary contact differences."},{"question":"What is the depth of 3RT2028-1AN24?","answer":"The depth is 141 mm. This is the dimension from the DIN rail mounting surface to the furthest forward point of the contactor body."},{"question":"What wire sizes does 3RT2028-1AN24 accept?","answer":"For main contacts: solid or stranded conductors from 1 to 10 mm². For coil terminals: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded."},{"question":"Will 3RT2028-1AN24 drop into a panel specified for 3RT2028-1AU00?","answer":"Both are Size S0 contactors with the same 45 mm width, 85 mm height, and 141 mm depth. The mounting hole pattern and DIN rail clip are identical. The main difference is the coil terminal type — 3RT2028-1AN24 uses screw-type terminals; 3RT2028-1AU00 may use a different terminal style (cage clamp or screw). If the panel wiring is terminated with ring or fork terminals for screw clamps, the 1AN24 will fit without rewiring. If the 1AU00 uses cage clamps, you may need to change the terminal ends."},{"question":"What compliance documentation is available for 3RT2028-1AN24?","answer":"As a standard Siemens SIRUS product, it carries CE marking for the European market and is designed to meet IEC/EN 60947-4-1. RoHS and REACH declarations are available from Siemens documentation. UL/CSA listings are typical for the SIRIUS line, but specific file numbers should be confirmed from the official Siemens declaration or the product label."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2028-1AN24","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/3RT2028-1AN24 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}