{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5BF42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5BF42","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5BF42","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5BF42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS magnet coil, 3RT1944-5BF42, 110 V DC, for Size S3 contactors, spring-loaded connection technology.","salesMarkdown":"## Magnet coil for SIRIUS S3 contactors — 110 V DC, spring-loaded termination The Siemens SIRIUS 3RT1944-5BF42 is a DC magnet coil rated at 110 V, designed for Size S3 contactors in the SIRIUS family. It uses spring-loaded connection technology, which means the coil wires terminate into cage-clamp terminals — no screwdriver torque required, faster panel wiring, and vibration-resistant retention on the DIN rail. ## Lifecycle and replacement path This coil is marked as a phased-out product. The official successor is the SIRIUS 3RT2 series coil.","metaTitle":"Siemens 3RT1944-5BF42 SIRIUS Magnet Coil, 110 V DC, S3","metaDescription":"Siemens SIRIUS 3RT1944-5BF42 magnet coil for Size S3 contactors, 110 V DC, spring-loaded connection. 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":{"lifecycle_stage":"current","Product Brand Name":"SIRIUS","1 at DC rated value":"110 V","Product Designation":"Magnet coil","Type Of Voltage Of The Control Supply Voltage":"DC"}},"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=145128&mlfb=3RT1944-5BF42","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5BF42/alternatives.json"},"ai":{"faq":[{"question":"What replaces 3RT1944-5BF42?","answer":"The official successor is the SIRIUS 3RT2 series coil for Size S3 contactors at 110 V DC. Validate the replacement against your panel layout — Siemens typically maintains the same mounting footprint and coil voltage, but terminal arrangement and auxiliary contact interfaces may change."},{"question":"Where can I buy 3RT1944-5BF42?","answer":"This phased-out coil is sourced to order against an RFQ through independent distribution channels that carry remaining new-old-stock and verified surplus inventory. Submit an RFQ with the order code and quantity; 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/3RT1944-5BF42","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/3RT1944-5BF42 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}}