{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5BG42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5BG42","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5BG42","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5BG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS magnet coil, 3RT1944-5BG42, 125 V DC, spring-loaded connection, for size S3 contactors, phased-out product.","salesMarkdown":"The Siemens SIRIUS 3RT1944-5BG42 is a replacement magnet coil for size S3 contactors in the SIRIUS family. It operates on a 125 V DC control supply and uses spring-loaded (cage-clamp) connection technology for the coil terminals — no screwdriver needed on the coil wiring, which speeds up panel assembly and reduces loose-terminal callbacks. This coil is listed as a phased-out product. The official successor is the SIRIUS 3RT2 series coil for the same contactor frame size. For new designs or BOM refreshes, the 3RT2 replacement should be qualified; for installed panels, this 3RT1944-5BG42 remains the drop-in service part. Mounts directly onto the SIRIUS S3 contactor body — size S3 (70 mm wide frame, typically 45–65 A AC-3 rated contactors). Panel builders should note the coil sits on the front of the contactor, so side-by-side mounting density is unaffected by the coil swap. The key difference from the smaller SIRIUS S00 coil (e.g., 3RT1016-1BB42 at 24 V DC) is voltage and frame size. The 3RT1944-5BG42 is a 125 V DC coil for the S3 frame; the S00 coils are physically smaller (45 mm wide) and limited to lower contactor ratings. A panel originally specified with S00 coils cannot accept this S3 coil without changing the entire contactor base.","metaTitle":"Siemens 3RT1944-5BG42 Magnet Coil, 125 V DC, SIRIUS S3","metaDescription":"Siemens SIRIUS 3RT1944-5BG42 magnet coil for size S3 contactors, 125 V DC, spring-loaded connection. Phased-out; successor 3RT2 series. Sourced to order.","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":"125 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=366719&mlfb=3RT1944-5BG42","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5BG42/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1944-5BG42?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an inquiry for a firm price and lead time."},{"question":"What replaces 3RT1944-5BG42?","answer":"The manufacturer's official successor is the SIRIUS 3RT2 series coil for the same contactor frame size S3. Verify the specific 3RT2 order code for your voltage (125 V DC) before ordering."},{"question":"Will 3RT1944-5BG42 fit a panel built with 3RT1016-1BB42?","answer":"No — the 3RT1944-5BG42 is a size S3 coil (70 mm wide contactor frame), while the 3RT1016-1BB42 is a size S00 coil (45 mm wide). They are not mechanically interchangeable without replacing the entire contactor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1944-5BG42","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/3RT1944-5BG42 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}}