{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5BF41","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5BF41","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5BF41","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5BF41","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS magnet coil, Size S3, screw terminal, 110 V DC, for 3RT1 contactors.","salesMarkdown":"The Siemens 3RT1944-5BF41 is a SIRIUS magnet coil designed for Size S3 power contactors. It's the replacement coil you'd pull off the shelf when the original coil on a 3RT1 S3 contactor fails in the field — screw-terminal connection, 110 V DC control supply voltage. This is a phased-out product; the official successor is the SIRIUS 3RT2 series coil. ## What the 110 V DC coil rating means on site 110 V DC is a common control voltage in industrial panels, especially where DC bus distribution is used for contactor coils. The screw terminals on this S3 coil match the existing wiring on 3RT1 contactors — no need to re-terminate or swap connectors. If you're swapping a failed coil in a live panel, verify the control supply is isolated and discharged before you touch the terminals; DC coils don't drop out as cleanly as AC on power loss. ## Panel fit and mechanical integration This coil mounts directly onto a SIRIUS Size S3 contactor frame — it's not a standalone device. The screw-terminal connection accepts the same wire gauges as the contactor's control circuit. No DIN-rail space consumed beyond the contactor itself; the coil is an integral part of the contactor assembly.","metaTitle":"Siemens 3RT1944-5BF41 SIRIUS Magnet Coil, 110 V DC, S3","metaDescription":"Siemens SIRIUS 3RT1944-5BF41 magnet coil for Size S3 contactors, 110 V DC. Phased-out product with successor 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":"$68.58","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=140655&mlfb=3RT1944-5BF41","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5BF41/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3RT1944-5BF41 and how is it quoted?","answer":"This part is sourced through independent industrial automation distribution. It is quoted to order against an RFQ; availability and current pricing are confirmed at quote time. No volume minimums are stated, but typical sourcing for phased-out parts is on a per-order basis."},{"question":"What is the closest functional second-source for 3RT1944-5BF41?","answer":"The official successor is the SIRIUS 3RT2 series coil. There is no direct drop-in second-source from another manufacturer; the S3 contactor frame is specific to the SIRIUS 3RT1 platform. If you're replacing the entire contactor, the 3RT2 series is the direct replacement path."},{"question":"What brand is 3RT1944-5BF41?","answer":"The product brand name is SIRIUS, which is Siemens' line of industrial control components including contactors, motor starters, and accessories."},{"question":"Will 3RT1944-5BF41 drop into a panel specified around 3RT1016-1BB42?","answer":"No. The 3RT1944-5BF41 is a magnet coil for Size S3 contactors, while the 3RT1016-1BB42 is a Size S00 power contactor with a 24 V DC coil. The S3 and S00 frames are physically different sizes — the coil won't mechanically fit or electrically match without replacing the entire contactor assembly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1944-5BF41","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/3RT1944-5BF41 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}}