{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2028-2XJ40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2028-2XJ40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2028-2XJ40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2028-2XJ40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT2028-2XJ40-0LA2, DC coil 72 V, spring-type terminals, 45 mm width, 107 mm depth.","salesMarkdown":"## Integrator's first look Spring-type terminals on both coil and main contacts mean no screw torque to verify — strip, insert, release. The DC coil at 72 V rated value with a pickup ratio of 0.7 (initial value) means the coil pulls in reliably at about 50 V and holds down to that threshold — useful if your DC bus has droop under load. Arcing time is a tight 10 ms, which keeps contact wear predictable in DC switching. Switching frequency maxes at 750 1/h for AC-1, AC-2, AC-3, and AC-3e duty; drop to 250 1/h for AC-4 (plugging/inching). That AC-4 ceiling is the real limiter if you're jogging a motor repeatedly — plan the cycle rate around it. ## DC switching capability across voltages For DC load switching, the contactor is rated at 10 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, and 3 A at 400 V. The 5 hp rating at 230 V is an AC motor reference — for DC circuits, use the current/voltage table directly. These are the make/break capacities; for continuous current, the main contact rating (18...8 A range) governs. Spring-type terminals accept solid conductors 2x (1...10 mm²) and stranded 2x (0.5...2.5 mm²). Clearance distances: 10 mm upward, forward, and downward; 6 mm at the side. The auxiliary switch is included (yes), so no separate add-on for status feedback. Size S0 frame keeps the footprint compact for multi-contactor groups.","metaTitle":"Siemens 3RT2028-2XJ40-0LA2 SIRIUS Power Contactor, DC Coil,","metaDescription":"Siemens SIRIUS power contactor 3RT2028-2XJ40-0LA2, size S0, DC coil 72 V, spring-type terminals. Rated for AC-3 switching at 750 1/h. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"107 mm","Solid":"2x (1 ... 10 mm²)","Width":"45 mm","at DC":"30 ... 50 ms","Height":"102 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","Rated Value":"72 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","Type Of Voltage":"DC","at AC-1 maximum":"750 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":"Yes","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Full-Scale Value":"1.25","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":"10 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 500 V rated value":"2 A","at 600 V rated value":"27 A","at 690 V rated value":"1 A","Design Of The Product":"With extended operating range","Instantaneous Contact":"1","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","at AC-2 at AC-3e maximum":"750 1/h","Relative Humidity Minimum":"10 %","at maximum Ith rated value":"10 mm²","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at maximum AC-1 rated value":"10 mm²","at AC in hot operating state":"11.4 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","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","Duration Of Locked-Rotor Current":"180 ms","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","Product Function Bus 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":"1.6 W","closing power of magnet coil at DC":"13.2 W","holding power of magnet coil at DC":"1.3 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":"3.8 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","Product Function Short Circuit Protection":"No","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 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Type Of Voltage Of The Control Supply Voltage":"DC","up to 40 °C according to IEC 60077 rated value":"50 A","up to 70 °C according to IEC 60077 rated value":"38 A","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)","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$120.65","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c08326d517e0c273d1416887078a0779.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=186402&mlfb=3RT2028-2XJ40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2028-2XJ40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3RT2028-2XJ40-0LA2 and how is it quoted for volume purchases?","answer":"This part is sourced through independent distribution channels and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock count or price is published here."},{"question":"What is 3RT2028-2XJ40-0LA2's listed depth on this component line?","answer":"The depth is 107 mm, with a width of 45 mm and height of 102 mm, fitting the S0 contactor frame size."},{"question":"What compliance documentation does this brand provide for 3RT2028-2XJ40-0LA2?","answer":"As a Siemens SIRIUS product, this contactor is designed to meet applicable IEC and UL standards typical for industrial control equipment. Specific RoHS, REACH, UL, or IEC declarations are available from Siemens documentation upon request through the supply channel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2028-2XJ40-0LA2","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/3RT2028-2XJ40-0LA2 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}}