{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT7045-1AN20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT7045-1AN20","canonicalUrl":"https://aoctrl.com/siemens/3RT7045-1AN20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT7045-1AN20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT7045-1AN20, size S3 contactor, 3-pole main contacts, screw-type terminals, AC-3 rated to 690 V, IP20 front / IP00 terminal enclosure.","salesMarkdown":"The Siemens 3RT7045-1AN20 is a size S3 contactor from the SIRIUS family, built for switching three-phase motor loads up to 690 V AC-3. It carries three normally-open main poles and screw-type terminals on both the main and auxiliary circuits. Fastening is by screw or snap-on onto 35 mm or 75 mm standard mounting rail, with generous mounting-position tolerance — ±180° rotation on a vertical surface and ±22.5° tilt forward or backward. ## AC-3 duty and switching cycle limits What matters for a motor-starting application is the switching frequency: the contactor is rated for 800 operations per hour under AC-3 (or AC-3e) duty, but that drops to 250 operations per hour under AC-4 — the heavier inching/plugging duty. If your application cycles a motor more than once every 14 seconds under AC-3, or once every 14 seconds under AC-4, this contactor will exceed its mechanical design rate. The holding power of the DC magnet coil is 0.27 W, with a closing surge of 0.62 W — low enough to keep the control transformer small. The screw terminals accept two conductors per clamp: solid or stranded from 0.5 to 1.5 mm², or 0.75 to 2.5 mm². Finely stranded wire with ferrule is handled the same way. The auxiliary switch block is field-addable — the product extension for auxiliary switches is supported.","metaTitle":"Siemens 3RT7045-1AN20 Contactor, S3 Size, 690 V AC-3, 3-Pole","metaDescription":"Siemens 3RT7045-1AN20 SIRIUS contactor, size S3, 3-pole, 690 V AC-3 max, screw terminals, IP20 front. Active lifecycle, sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Width":"70 mm","Height":"148 mm","at 50 Hz":"0.27","at 60 Hz":"0.31","On The Front":"IP20","During Storage":"-25 ... +70 °C","Of The Terminal":"IP00","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 and 75 mm standard mounting rail","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":"S3","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","closing power of magnet coil at DC":"0.62 W","holding power of magnet coil at DC":"0.27 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gL/gG NH 3NA: 200 A","shock resistance with sine pulse at AC":"10.6g / 5 ms, 6.2g / 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":"50 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=1534166&mlfb=3RT7045-1AN20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT7045-1AN20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT7045-1AN20 and get a price?","answer":"This part is sourced and quoted to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What is the AC-3 voltage rating of 3RT7045-1AN20?","answer":"The AC-3 rated maximum voltage is 690 V, covering standard 400 V and 480 V three-phase supplies with margin."},{"question":"Will 3RT7045-1AN20 drop into a panel specified for 3RT6026-1AN20?","answer":"The 3RT7045-1AN20 is a size S3 contactor, while the 3RT6026 series is a smaller S2 frame. The footprint, terminal spacing, and DIN-rail width differ — it will not be a direct mechanical swap without panel rework. Check the mounting dimensions before ordering."},{"question":"What compliance documentation does Siemens provide for 3RT7045-1AN20?","answer":"Standard Siemens SIRIUS documentation includes CE marking and UL/CSA recognition per the series. RoHS and REACH declarations are available through Siemens Industry Online Support. The surge voltage resistance is rated at 6 kV, and the contactor is designed for pollution degree 3 environments."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT7045-1AN20","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/3RT7045-1AN20 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}}