{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5BD41","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5BD41","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5BD41","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5BD41","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1944-5BD41 magnet coil, Size S3, screw terminal, 42 V DC, for 3RT1 S3 contactors.","salesMarkdown":"The Siemens 3RT1944-5BD41 is a SIRIUS-branded magnet coil for Size S3 contactors, terminated with screw terminals and wound for a 42 V DC control supply. It is the replacement coil for any 3RT1 S3 contactor body that needs a 42 V DC pull-in and hold coil. ## What the 42 V DC rating means in practice The 42 V DC coil voltage is a control-circuit spec, not a power rating. It means the coil is designed to pull in and hold reliably when supplied with 42 V DC — common in safety-isolated control circuits or legacy 48 V battery-backed systems stepped down slightly. On a Size S3 contactor, the coil draws its rated inrush then settles to a holding power; the screw terminals accept the same wire gauges as the main contactor terminals, typically 2x (0.5... 1.5 mm²) or 2x (0.75... 2.5 mm²) for the control wiring. Mounts directly onto the 3RT1 S3 contactor body via the standard snap-on interface — no adapter needed. Because the coil is a direct snap-on replacement for the S3 contactor, the DIN-rail footprint and panel cutout are already set by the contactor body. The screw terminals face forward, so wiring access is straightforward even in a dense enclosure. No additional clearance beyond the contactor's own side spacing (6 mm to grounded parts) is required for the coil itself.","metaTitle":"Siemens 3RT1944-5BD41 SIRIUS Magnet Coil, 42 V DC, Size S3","metaDescription":"Siemens 3RT1944-5BD41 SIRIUS magnet coil for Size S3 contactors, 42 V DC screw terminal. Phased-out product; successor is SIRIUS 3RT2 series. 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":"42 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=445366&mlfb=3RT1944-5BD41","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5BD41/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1944-5BD41 and get a price?","answer":"This coil is sourced through independent distribution. Submit an RFQ for a current availability check and pricing — confirmed at quote time against the specific quantity needed."},{"question":"What compliance documentation is available for 3RT1944-5BD41?","answer":"As a Siemens SIRIUS component, this coil carries CE marking and is designed to meet applicable IEC/EN standards for industrial control equipment. Specific RoHS and REACH declarations are typically available through Siemens Industry Online Support using the order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1944-5BD41","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/3RT1944-5BD41 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}}