{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5AB01","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5AB01","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5AB01","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AB01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1944-5AB01 magnet coil, Size S3, screw terminal, 24 V AC, 50 Hz, phased-out product.","salesMarkdown":"The Siemens SIRIUS 3RT1944-5AB01 is a magnet coil for Size S3 contactors — the electromagnet that pulls the contactor in and holds it closed. It's a 24 V AC coil rated for 50 Hz operation, with a screw terminal connection for the control circuit. This is the replacement coil for a SIRIUS 3RT1 contactor that has lost its coil or needs a different control voltage. ## Lifecycle reality — phased out, successor named This part is flagged as a phased-out product. If you're holding a panel with a 3RT1 contactor and need a spare coil, this 3RT1944-5AB01 is the direct fit — but for new designs or long-term spares planning, the 3RT2 successor is the path forward. ## Fit and integration — Size S3, screw terminals, DIN rail This coil mounts onto a SIRIUS Size S3 contactor frame. The coil has screw terminals for the 24 V AC control wiring — no special tooling needed, just a screwdriver. The 50 Hz rating means it's designed for 50 Hz mains; using it on 60 Hz without checking the coil's voltage tolerance band (0.8 to 1.1 times rated voltage) could cause overheating or failure to hold in.","metaTitle":"Siemens 3RT1944-5AB01 SIRIUS Magnet Coil, 24 V AC, 50 Hz","metaDescription":"Siemens SIRIUS 3RT1944-5AB01 magnet coil for Size S3 contactors. 24 V AC, 50 Hz, screw terminals. Phased-out product; successor is SIRIUS 3RT2. 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":"24 V","Type Of Voltage Of The Control Supply Voltage":"AC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$68.58","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=280620&mlfb=3RT1944-5AB01","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AB01/alternatives.json"},"ai":{"faq":[{"question":"What replaces the 3RT1944-5AB01?","answer":"The official successor is the SIRIUS 3RT2 series. For a direct coil replacement on a Size S3 contactor, you would need to identify the equivalent 3RT2 coil order code that matches your control voltage (24 V AC, 50 Hz)."},{"question":"What is the coil voltage and frequency for the 3RT1944-5AB01?","answer":"The coil is rated for 24 V AC at 50 Hz. The operating range at 50 Hz is 0.8 to 1.1 times the rated voltage, so it will pick up and hold between about 19.2 V and 26.4 V AC."},{"question":"What compliance documentation is available for the 3RT1944-5AB01?","answer":"The evidence does not list specific compliance certifications (UL, CSA, CE, RoHS, REACH) for this coil. As a Siemens SIRIUS component, it typically carries CE marking for the European market, but you should verify the specific declarations for your jurisdiction when ordering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1944-5AB01","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/3RT1944-5AB01 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}}