{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2028-2XL40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2028-2XL40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2028-2XL40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2028-2XL40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor, 3RT2028-2XL40-0LA2, size S0, 36 V DC coil, spring-type terminals, 10 A at 24 V DC, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"## SIRIUS S0 Contactor, 36 V DC Coil The Siemens 3RT2028-2XL40-0LA2 is a SIRIUS-brand contactor in the size S0 frame, with a 36 V DC coil and spring-type terminals on both the coil and main contacts. Rated for 10 A at 24 V DC, 2 A at 48 V DC, and 2 A at 60 V DC, this contactor handles DC switching loads across a range of control voltages. The DC coil type (30...50 ms switching time) suits applications where AC ripple is absent or where battery-backed control circuits are used. Mechanical life is rated at 10,000,000 operations typical, with maximum switching frequencies of 750 1/h under AC-1, AC-2, AC-3, and AC-3e duty, and 250 1/h under AC-4. The AC-4 derating reflects the heavier arc stress of plugging or inching duty. ## Panel Fit and Clearances Dimensions: 102 mm high, 45 mm wide, 107 mm deep. The depth of 107 mm is the full body depth including the spring terminals — verify that the enclosure depth allows for wiring space behind the DIN rail. These are the free-air spacing requirements for arc containment and heat dissipation; tighter packing may require derating or a thermal study. This covers most panel layouts without forced derating. Main contacts accept solid conductors of 2x (1... 10 mm²) or stranded conductors of 2x (0.5... 2.5 mm²). The spring-type terminals on the coil eliminate the need for screw tightening — strip to the correct length and push in. An auxiliary switch is included, which can be used for status feedback or interlocking in the control circuit. ## Environmental Range Operating temperature spans -40 to +70 °C, covering most industrial enclosures including unheated outdoor cabinets.","metaTitle":"Siemens 3RT2028-2XL40-0LA2 SIRIUS Contactor, 36 V DC, Size S","metaDescription":"Siemens SIRIUS contactor 3RT2028-2XL40-0LA2, 36 V DC coil, size S0, 10 A at 24 V DC. Spring-type terminals, DIN rail mount. 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":"36 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 standard mounting 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":"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 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","at AWG cables for main contacts":"2x (18 ... 8)","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)","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":"3.8 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","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":"395 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":"186 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"152 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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/30de15cd5cf425f526f156a4835eef10.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=811826&mlfb=3RT2028-2XL40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2028-2XL40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2028-2XL40-0LA2 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is 3RT2028-2XL40-0LA2's listed depth (107 mm) on this component line?","answer":"The depth is 107 mm, measured from the DIN rail mounting surface to the front of the spring terminals. This is the full body depth — allow additional clearance for wiring and arc containment per the 10 mm forward clearance spec."},{"question":"What is 3RT2028-2XL40-0LA2's listed solid (2x (1... 10 mm²)) on this component line?","answer":"The main contacts accept solid conductors of 2x (1... 10 mm²). For stranded conductors, the range is 2x (0.5... 2.5 mm²). The coil uses spring-type terminals."},{"question":"Will 3RT2028-2XL40-0LA2 drop into a panel that was specified around 3RT2326-1BK80 without rewiring?","answer":"Both are SIRIUS size S0 contactors with the same DIN rail footprint and terminal layout, so the mechanical fit and wiring pattern are identical. The key difference is the coil voltage: this unit is 36 V DC, while the 3RT2326-1BK80 may have a different coil rating — verify the control circuit voltage before substitution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2028-2XL40-0LA2","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/3RT2028-2XL40-0LA2 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}}