{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5AF02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5AF02","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5AF02","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AF02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1944-5AF02 magnet coil, 110 V AC 50 Hz, spring-loaded connection, for Size S3 contactors, phased-out product.","salesMarkdown":"The Siemens SIRIUS 3RT1944-5AF02 is a replacement magnet coil for Size S3 contactors in the SIRIUS family. It operates on 110 V AC at 50 Hz, with a rated operating range of 0.8 to 1.1 times the nominal voltage — meaning the coil will reliably pick up and hold as long as the supply stays between roughly 88 V and 121 V AC. The coil uses spring-loaded (cage-clamp) terminals, which speed up panel wiring compared to screw terminals: strip 8–10 mm, push the conductor in, done. This coil is sized for SIRIUS Size S3 contactors — the frame that handles motor currents roughly in the 38–65 A range (AC-3). The spring-loaded connection technology matches the terminal style on later SIRIUS contactors; if your panel uses screw-type control wiring, you will need a ferrule or pin terminal to fit the cage clamp. The coil mounts directly onto the contactor magnet stack; no DIN-rail space consumed beyond the contactor itself.","metaTitle":"Siemens 3RT1944-5AF02 SIRIUS Magnet Coil, 110 V AC, 50 Hz","metaDescription":"Siemens SIRIUS 3RT1944-5AF02 magnet coil for Size S3 contactors, 110 V AC 50 Hz, spring-loaded terminals. Phased-out; successor is 3RT2 series. Sourced to order.","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","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=171410&mlfb=3RT1944-5AF02","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AF02/alternatives.json"},"ai":{"faq":[{"question":"What is the coil voltage for 3RT1944-5AF02?","answer":"110 V AC at 50 Hz. The operating range is 0.8 to 1.1 times the rated voltage."},{"question":"Where can I buy 3RT1944-5AF02?","answer":"This phased-out part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1944-5AF02","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/3RT1944-5AF02 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}}