{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT7027-1AN20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT7027-1AN20","canonicalUrl":"https://aoctrl.com/siemens/3RT7027-1AN20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT7027-1AN20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT7027-1AN20, S0 size contactor, 3-pole, 690 V AC-3/AC-3e max, 45 mm width, screw terminals, IP20 front and terminal protection.","salesMarkdown":"The Siemens 3RT7027-1AN20 is a S0 frame size contactor in the SIRIUS family, with three main poles and three normally-open main contacts. It mounts on a 35 mm DIN rail per DIN EN 50022 using the screw and snap-on method, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward and backward. At 45 mm wide, it slots into a standard panel without special spacing. The AC-3 rating at 690 V means this contactor handles the inrush and breaking of squirrel-cage motors up to that line voltage. Its auxiliary contact circuit is rated 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V — so the same set of contacts can switch pilot duty loads across different control voltages. ## Wiring and Coordination Notes Both main and auxiliary/control circuits use screw-type terminals. The main circuit accepts solid or stranded wire: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) per clamp, and the same range applies for finely stranded wire with ferrules. This is typical for a panel wireman working with standard control cable. For Type 2 coordination (no-weld after fault), the required upstream fuse is a gL/gG NH 3NA: 50 A. For Type 1 coordination (welding allowed but no fire risk), the same fuse type is rated 125 A. This matters when you're coordinating selectivity upstream in a distribution board. The magnet coil draws 0.72 W on closing and 0.24 W holding at DC — low enough that a standard 24 VDC PLC output or relay can drive it directly without an interposing relay in most cases.","metaTitle":"Siemens 3RT7027-1AN20 S0 Contactor, 3-Pole, 690V AC-3, 45mm","metaDescription":"Siemens 3RT7027-1AN20 S0 contactor, 3-pole, 690V AC-3/AC-3e max, 45mm wide, screw terminals, IP20. Active production, sourced 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","at AC-3e maximum":"800 1/h","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":"220 V","at 60 Hz rated value":"220 V","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-3 rated value maximum":"690 V","at AC-3e rated value maximum":"690 V","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","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=1534008&mlfb=3RT7027-1AN20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT7027-1AN20/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"The contactor is 45 mm wide, 85.5 mm high, and 91 mm deep. The 45 mm width is the critical dimension for DIN-rail spacing in a panel layout."},{"question":"Will the 3RT7027-1AN20 drop into a panel designed for the 3RT7025-1AN20?","answer":"Both are S0 frame contactors with the same 45 mm width and DIN-rail mounting. The 3RT7027-1AN20 is the higher-rated variant in the same mechanical footprint, so it will physically fit without rewiring the main power terminals. Verify the control coil voltage matches your circuit."},{"question":"What compliance documentation is available for this contactor?","answer":"The part carries IP20 protection ratings and is designed for pollution degree 3 environments. Standard Siemens SIRIUS documentation includes CE, UL, CSA, and CCC certifications; specific declarations are available through the manufacturer's documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT7027-1AN20","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/3RT7027-1AN20 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}}