{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2027-1AU20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2027-1AU20","canonicalUrl":"https://aoctrl.com/siemens/3RT2027-1AU20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2027-1AU20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2027-1AU20, S0 frame, 24 VAC 50/60 Hz coil, screw-type terminals, 45 mm wide, for DIN rail mounting.","salesMarkdown":"## What It Is & Where It Goes The 24 VAC 50/60 Hz coil draws 0.25 A at 50 Hz and 0.28 A at 60 Hz — a standard control voltage that matches most PLC or relay outputs in European and North American panels. The 45 mm width and 85 mm height fit standard S0 contactor spacing in a panel. ## Switching Performance & Duty Cycles Rated for 1 000 000 electrical operations typical. Maximum switching frequency varies by duty: 1 000 cycles/hour for AC-1 (resistive), 750 cycles/hour for AC-2 and AC-3 (motor starting/running), and 250 cycles/hour for AC-4 (plugging/inching). Arcing time is 10 ms. For a bottling line or conveyor running at moderate start frequency, the AC-3 rating of 750 cycles/hour is the relevant limit — it means the contactor can handle a start every ~5 seconds without overheating the arc chamber. ## Auxiliary & Main Contact Configuration Includes an auxiliary switch block. Main contacts accept wire sizes 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). The S0 frame matches the 3RT2027-1AP60 for mechanical fit.","metaTitle":"Siemens 3RT2027-1AU20 SIRIUS Power Contactor, S0 Frame, 24 V","metaDescription":"Siemens 3RT2027-1AU20 SIRIUS power contactor, S0 frame, 24 VAC 50/60 Hz coil, screw terminals, 45 mm wide, active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"97 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at AC":"4 ... 16 ms","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","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","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":"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":"27 A","at 50 Hz rated value":"380 V","at 500 V rated value":"2 A","at 60 Hz rated value":"380 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":"2 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"20 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":"6.3 W","at AC-2 at 400 V rated value":"15 kW","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":"26.5 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":"2.3 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":"499 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":"https://cdn.aoctrl.com/c3ca831b793193047f4f0b55357d6ab7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=441069&mlfb=3RT2027-1AU20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2027-1AU20/alternatives.json"},"ai":{"faq":[{"question":"What is the depth dimension?","answer":"The depth is 97 mm. This is the dimension from the DIN rail mounting surface to the front of the contactor, including the arc chamber and terminals."},{"question":"What wire sizes does the coil terminal accept?","answer":"The screw-type coil terminals accept solid or stranded wire from 1 to 10 mm². For the main contact control circuit, it accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²)."},{"question":"What compliance documentation is available?","answer":"As a Siemens SIRIUS product, the 3RT2027-1AU20 carries CE marking for the European market and is designed to meet IEC/EN 60947-4-1. RoHS and REACH compliance declarations are standard from Siemens. UL and CSA listings are typical for this series, though the specific certification numbers should be confirmed against the nameplate on the unit you receive."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2027-1AU20","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/3RT2027-1AU20 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}}