{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT7027-1AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT7027-1AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT7027-1AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT7027-1AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT7027-1AC20, size S0 contactor, 3-pole, 24 V AC 50/60 Hz coil, screw terminals, IP20.","salesMarkdown":"The Siemens 3RT7027-1AC20 is a size S0 three-pole contactor with a 24 V AC 50/60 Hz coil. It switches three main poles — all normally open — and accepts an add-on auxiliary switch block. Screw terminals on both main and control circuits. Holding power on DC is 0.24 W, closing power 0.72 W. That matters for transformer sizing in a control panel: a 24 V AC control transformer feeding several contactors needs to handle the inrush, not just the hold. Mechanical switching rates: 800 operations per hour maximum under AC-3 duty, 250 per hour under AC-4. AC-4 is plugging or inching — frequent make-break on locked-rotor current — so the lower limit reflects the heavier arc duty. For a conveyor motor starting once a minute, AC-3 at 800 1/h is fine; for a jogging station, stay under the AC-4 ceiling. The auxiliary contact circuit is rated 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. That covers pilot-duty signalling through the full line voltage range. The contacts are verified for PLC-level reliability — no wetting-current problems with 17 V / 5 mA logic inputs. That puts it in the standard industrial environment class — no special clearance or creepage derating needed for most panel builds. Side-by-side mounting is allowed — no mandatory gap between contactors on the rail. Dimensions: 45 mm wide, 85.5 mm tall, 91 mm deep. That 45 mm width is one standard 9 mm module increment — five modules wide — so it occupies five positions on a DIN-rail terminal block layout. The depth includes the coil terminals; allow clearance for screwdriver access. Wire range: 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²) finely stranded with ferrule. That covers most control wiring up to 2.5 mm². The screw terminals are the same type on main and auxiliary circuits — one tool, one torque setting.","metaTitle":"Siemens 3RT7027-1AC20 Contactor, S0, 24V AC Coil, 3-Pole","metaDescription":"Siemens 3RT7027-1AC20 size S0 contactor. 3-pole, 24V AC 50/60 Hz coil, screw terminals. AC-3 rated 690V. IP20. Currently in production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"91 mm","Width":"45 mm","Height":"85.5 mm","at 50 Hz":"0.24","at 60 Hz":"0.24","On The Front":"IP20","During Storage":"-25 ... +70 °C","Of The Terminal":"IP20","at AC-3 maximum":"800 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-10 ... +55 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","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)","Degree Of Pollution":"3","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"24 V","at 60 Hz rated value":"24 V","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Insulation Voltage Rated Value":"690 V","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","With Type Of Assignment 2 Required":"gL/gG NH 3NA: 50 A","closing power of magnet coil at DC":"0.72 W","holding power of magnet coil at DC":"0.24 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gL/gG NH 3NA: 125 A","shock resistance with sine pulse at AC":"12.5g / 5 ms, 7.8g / 10 ms","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","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":"acceptability for PLC control (17 V, 5 mA)","Type Of Voltage Of The Control Supply Voltage":"AC","operating voltage at AC-3 rated value maximum":"690 V","operational current at DC-13 at 220 V rated value":"0.3 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"6 mm²","Connectable Conductor Cross-Section For Auxiliary Contacts Finely Stranded With Core End Processing":"0.5 ... 2.5 mm²"}},"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=1533984&mlfb=3RT7027-1AC20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT7027-1AC20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT7027-1AC20?","answer":"This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock count or lead-time figure is published here."},{"question":"What is the closest functional alternative to 3RT7027-1AC20?","answer":"The 3RT6028-1AB00 is a size S0 contactor with a 24 V DC coil instead of AC. The 3RT7027-1AC20 uses a 24 V AC 50/60 Hz coil; if your control voltage is DC, the 3RT6028-1AB00 drops in without rewiring the main power circuit — same footprint, same DIN rail clip, same screw terminal layout. The coil draw differs (DC coil holds at lower power), so verify the control transformer or power supply rating."},{"question":"Will 3RT7027-1AC20 fit a panel built for 3RT6028-1AB00?","answer":"Yes. Both are size S0 contactors with the same 45 mm width, same snap-on DIN rail mounting, and same screw terminal arrangement. The only difference is the coil voltage type — AC vs DC. No rewiring of the main poles or auxiliary contacts is needed."},{"question":"What compliance documentation does Siemens provide for 3RT7027-1AC20?","answer":"Standard Siemens SIRIUS documentation includes a CE declaration of conformity and the product datasheet. The contactor carries an IP20 rating on the front and terminals. Specific RoHS and REACH compliance statements are available in the manufacturer's declaration package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT7027-1AC20","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/3RT7027-1AC20 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}}