{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2028-1NB30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2028-1NB30","canonicalUrl":"https://aoctrl.com/siemens/3RT2028-1NB30","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2028-1NB30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, size S0, 3RT2028-1NB30, 24 VDC coil, screw-type terminals, 45 mm width, 85 mm height, 107 mm depth.","salesMarkdown":"The coil is rated 21 to 28 VDC with a 24 V rated-value pickup current of 10 A and an inrush peak of 3 A. The magnet coil uses screw-type terminals, and an auxiliary switch is built in. Mechanical life is typical at 10 million operations. Maximum switching rates are 1 000 cycles/hour under AC-1 (resistive load), 750 cycles/hour under AC-3 (motor starting), and 250 cycles/hour under AC-4 (plugging/inching). This covers most indoor panel environments without forced derating. The AC-3 switching rate of 750 cycles/hour tells you this contactor is sized for frequent motor starting — typical for conveyors, pumps, and fans in a production line. The AC-1 rate of 1 000 cycles/hour covers resistive heater or lighting loads. The AC-4 rate of 250 cycles/hour limits plugging and inching duty; if your application requires frequent reversing or jogging, stay within that envelope. The coil holding voltage range is 21 to 28 V. It stays pulled in through dips down to 21 V.","metaTitle":"Siemens 3RT2028-1NB30 SIRIUS Power Contactor, S0, 24 VDC Coi","metaDescription":"Siemens 3RT2028-1NB30 SIRIUS power contactor, size S0, 24 VDC coil, screw terminals. 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":"107 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at AC":"30 ... 50 ms","at DC":"30 ... 50 ms","Height":"85 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","at 50 Hz":"0.86","at 60 Hz":"0.82","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","Rated Value":"21 ... 28 V","Initial Value":"0.7","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":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Full-Scale Value":"1.3","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","Inrush Current Peak":"3 A","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 50 Hz rated value":"21 ... 28 V","at 500 V rated value":"2 A","at 60 Hz rated value":"21 ... 28 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","Locked-Rotor Current Peak":"0.52 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"45 mA","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","Design Of The Surge Suppressor":"with varistor","Duration Of Inrush Current Peak":"30 µs","Locked-Rotor Current Mean Value":"0.3 A","Duration Of Locked-Rotor Current":"180 ms","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":"2 W","closing power of magnet coil at DC":"5.9 W","holding power of magnet coil at DC":"1.4 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/DC","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 / P600","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":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=172056&mlfb=3RT2028-1NB30","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2028-1NB30/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RT2028-1NB30?","answer":"The depth is 107 mm, with a width of 45 mm and height of 85 mm. Clearance of 10 mm forward is needed for wiring access."},{"question":"What wire sizes does 3RT2028-1NB30 accept?","answer":"Solid or stranded conductors from 1 to 10 mm² on the main contacts. Auxiliary contacts accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²)."},{"question":"Will 3RT2028-1NB30 drop into a panel specified for 3RT2015-1BW42?","answer":"Both are S0 frame size contactors on 35 mm DIN rail, so the mounting footprint and panel cutout are the same. The coil voltage and terminal arrangement differ — verify the control voltage matches your circuit before swapping."},{"question":"What compliance documentation is available for 3RT2028-1NB30?","answer":"As a Siemens SIRIUS product, it carries CE marking for the European market and is designed to meet IEC/EN 60947-4-1 standards for contactors. RoHS and REACH declarations are available from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2028-1NB30","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/3RT2028-1NB30 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}}