{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2028-2AN24","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2028-2AN24","canonicalUrl":"https://aoctrl.com/siemens/3RT2028-2AN24","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2028-2AN24","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2028-2AN24, Size S0, 45 mm wide, spring-type coil terminals, screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715.","salesMarkdown":"It mounts on 35 mm DIN rail per DIN EN 60715, using either screw fixing or the integrated snap-on latch, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward and backward — useful when you're squeezing it into a crowded enclosure and need to orient the coil terminals toward the wiring duct. For heavier AC-4 duty (plugging, inching, reversing) the rate drops to 250 cycles per hour, reflecting the increased arc energy from breaking locked-rotor current. Coil connection uses spring-type terminals, so you're not torquing screws on the control wiring — strip, insert, done. The main power circuit accepts solid or stranded conductors from 1 to 10 mm², and the tightening torque range for the main contacts is 1.8 to 8 N·m, which covers standard power terminations up to that cross-section. The 45 mm width is the critical panel-space figure for this Size S0 contactor — it occupies one standard 45 mm module on the DIN rail, so you can plan your rail fill around it. Depth is 144 mm, height 102 mm, which fits within typical 200 mm deep enclosures but check clearance for the arc chamber and coil terminals if you're mounting against a back panel. The rated operational current at 24 V is 6 A, at 400 V it's 3 A, and at 440 V it drops to 0.6 A — these are the switching current limits at those voltages, not the continuous thermal current. The contactor's thermal current rating (Ith) is not listed here, but the AC-1 maximum operating cycle rate of 1000 per hour suggests the resistive load handling is generous. The storage range is wider because the contactor isn't energized during storage, so the coil insulation and mechanical parts see a broader thermal cycle. No auxiliary switch block is included with this base variant — the 3RT2028-2AN24 ships as a bare contactor. If you need auxiliary contacts for status feedback or interlocking, you'll add a separate side-mounting block. The mechanical life is quoted at 10 million typical operations, which is the expected life before mechanical wear (spring fatigue, armature pivot wear) becomes an issue — electrical life will be shorter and depends on the switching current and duty cycle. The lifecycle stage for the 3RT2028-2AN24 is recorded as current production — this is an active catalog item, not a phase-out or obsolete line. That means it's available through standard Siemens distribution channels and you can quote it against a BOM line without worrying about last-time-buy windows or forced redesigns. The SIRIUS platform is Siemens' mainstream industrial control range, so spares and replacements are broadly stocked. For a sourcing decision: this part is a standard catalog item, so the procurement posture is straightforward — specify it into the BOM, and it will be quoted to order through normal distribution. No special lead-time risk or allocation applies based on the lifecycle status alone.","metaTitle":"Siemens 3RT2028-2AN24 SIRIUS Power Contactor, Size S0, 45 mm","metaDescription":"Siemens 3RT2028-2AN24 SIRIUS power contactor, Size S0, 45 mm wide, AC-3 rated 750 cycles/h, spring-type coil terminals, screw and snap-on mounting on 35 mm DIN rail. Current produc","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","title":"3RT2028-2AN24","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","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, spring-loaded terminal, size: S0, removable auxiliary switch","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":"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":"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-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":"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)","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 ... 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)","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/78ba4a5d2986ae06363dff262a996393.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=137471&mlfb=3RT2028-2AN24"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"Width is 45 mm (one standard DIN-rail module), height is 102 mm, depth is 144 mm. The mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward."},{"question":"What conductor sizes does the main circuit accept?","answer":"Solid and stranded conductors from 1 to 10 mm². The tightening torque range for main contacts is 1.8 to 8 N·m."},{"question":"Does this contactor include auxiliary contacts?","answer":"No, the 3RT2028-2AN24 ships without an auxiliary switch block. Auxiliary contacts must be added as a separate side-mounting module."},{"question":"What is the maximum switching frequency for motor duty?","answer":"For AC-3 duty (standard motor switching) the maximum is 750 operating cycles per hour. For AC-4 duty (plugging, reversing) the maximum is 250 cycles per hour."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2028-2AN24","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/3RT2028-2AN24 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}}