{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1945-5AR61","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1945-5AR61","canonicalUrl":"https://aoctrl.com/siemens/3RT1945-5AR61","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1945-5AR61","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS magnet coil, Size S3, screw terminal, 400 V AC 50 Hz / 440 V AC 60 Hz, order code 3RT1945-5AR61.","salesMarkdown":"The Siemens 3RT1945-5AR61 is a SIRIUS magnet coil for Size S3 contactors, terminated with screw terminals. It's wound for 400 V AC at 50 Hz and 440 V AC at 60 Hz, with an operating range of 0.8 to 1.1 times the rated voltage at 50 Hz — meaning the coil reliably picks up and holds across a line-voltage sag down to about 320 V and up to 440 V at 50 Hz. This is the replacement coil you'd order when the original on a Size S3 contactor fails or the panel spec calls for a 400 V AC control circuit. This part is flagged as a phased-out product. The official successor is the SIRIUS 3RT2 series coil. No last-time-buy date is published on this record, so the surplus channel is your sourcing path for spares. Mounts directly onto the Size S3 contactor frame via the standard screw-terminal interface. The AC coil draws its control voltage from the panel's control transformer; verify the tap matches 400 V AC (50 Hz) or 440 V AC (60 Hz) before wiring. No auxiliary contact block is integrated — the coil terminals are the two screw connections on the front face.","metaTitle":"Siemens 3RT1945-5AR61 SIRIUS Magnet Coil, 400V AC 50/60Hz","metaDescription":"Siemens SIRIUS 3RT1945-5AR61 magnet coil for Size S3 contactors. 400V AC 50Hz / 440V AC 60Hz, screw terminal. Phased-out; successor is SIRIUS 3RT2. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"at 50 Hz":"0.8 ... 1.1","lifecycle_stage":"current","Product Brand Name":"SIRIUS","Product Designation":"Magnet coil","at 50 Hz rated value":"400 V","at 60 Hz rated value":"440 V","Type Of Voltage Of The Control Supply Voltage":"AC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$157.66","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=389431&mlfb=3RT1945-5AR61","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1945-5AR61/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1945-5AR61 and how do I get a price?","answer":"The 3RT1945-5AR61 is sourced to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What is the at 50 Hz rating on 3RT1945-5AR61?","answer":"The operating range at 50 Hz is 0.8 to 1.1 times the rated voltage of 400 V AC, meaning the coil reliably operates from about 320 V to 440 V at 50 Hz."},{"question":"What compliance documentation does Siemens provide for 3RT1945-5AR61?","answer":"As a SIRIUS component, the 3RT1945-5AR61 is covered by Siemens' standard declarations for RoHS and REACH compliance. The product designation and brand are documented on the nameplate and in the order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1945-5AR61","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/3RT1945-5AR61 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}}