{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5AK61","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5AK61","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5AK61","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AK61","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS magnet coil, Size S3, screw terminal, 110 V AC 50 Hz / 120 V 60 Hz, phased-out product with successor in the 3RT2 series.","salesMarkdown":"The Siemens 3RT1944-5AK61 is a SIRIUS magnet coil for Size S3 contactors, wired through screw terminals. It pulls in on 110 V AC at 50 Hz or 120 V AC at 60 Hz, with an operating range of 0.8 to 1.1 times the rated voltage — meaning the coil holds reliably down to about 88 V at 50 Hz and 96 V at 60 Hz, which matters when your control transformer sags under load out here in the grease. ## Lifecycle reality — this one is done This coil is a phased-out product. The manufacturer lists the lifecycle stage as 'current' in the sense that it's still a valid catalog entry, but the description flags it clearly: 'Phased-out product!!!' with the official successor being the SIRIUS 3RT2 series. If you're stocking spares for an existing panel, this coil works fine — just buy what you need now. For new builds or if you're planning a line-down swap, spec the 3RT2 replacement instead.","metaTitle":"Siemens 3RT1944-5AK61 SIRIUS Magnet Coil, 110 V AC 50 Hz / 1","metaDescription":"Siemens 3RT1944-5AK61 SIRIUS magnet coil for Size S3 contactors. 110 V AC 50 Hz / 120 V 60 Hz, screw terminal. Phased-out; successor 3RT2 series. 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":"110 V","at 60 Hz rated value":"120 V","Type Of Voltage Of The Control Supply Voltage":"AC"}},"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=69321&mlfb=3RT1944-5AK61","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AK61/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1944-5AK61 and how do I get a price?","answer":"We source this phased-out coil through independent distribution — new-old-stock and surplus. Submit an RFQ; availability and pricing are confirmed at quote time."},{"question":"What does the 0.8 to 1.1 operating range at 50 Hz mean?","answer":"It means the coil is guaranteed to pick up and hold when the control voltage is between 88 V and 121 V at 50 Hz (0.8 × 110 V to 1.1 × 110 V). Below 88 V it may drop out; above 121 V you risk overheating the coil."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1944-5AK61","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/3RT1944-5AK61 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}}