{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5AH02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5AH02","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5AH02","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AH02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Magnet coil for contactors Size S3, spring-loaded connection technology, 48 V AC 50 Hz, 0.8... 1.1 operating range.","salesMarkdown":"The Siemens 3RT1944-5AH02 is a SIRIUS magnet coil designed for Size S3 contactors, using spring-loaded connection technology. It's the replacement coil for a contactor that's lost its pull-in — common failure point on a line that's been cycling hard. Coil voltage is 48 V AC at 50 Hz, with an operating range of 0.8... 1.1 times rated voltage — meaning it pulls in reliably down to about 38.4 V and holds in up to 52.8 V, which gives you a decent margin on a sagging control transformer. ## Integration note — Size S3 contactor family This coil mates with the SIRIUS Size S3 contactor frame. Make sure your control supply is 50 Hz; this coil is not rated for 60 Hz operation.","metaTitle":"Siemens 3RT1944-5AH02 SIRIUS Magnet Coil, 48 V AC 50 Hz","metaDescription":"Siemens SIRIUS 3RT1944-5AH02 magnet coil for Size S3 contactors, 48 V AC 50 Hz, spring-loaded connection. Phased-out; successor is SIRIUS 3RT2 series. Available 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":"48 V","Type Of Voltage Of The Control Supply Voltage":"AC"}},"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=103055&mlfb=3RT1944-5AH02","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AH02/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1944-5AH02 and get a price?","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 RFQ to get a firm price and lead time for your quantity."},{"question":"What is the closest functional second-source for 3RT1944-5AH02?","answer":"The closest functional second-source is the SIRIUS 3RT2 series, which is the official successor. For a drop-in replacement on an existing Size S3 contactor, the 3RT1944-5AH02 is the correct service part. The 3RT1017-1AD02 is a different size (S00) and will not fit the S3 frame without mechanical modification."},{"question":"What is 3RT1944-5AH02's operating range at 50 Hz?","answer":"The operating range at 50 Hz is 0.8... 1.1 times the rated voltage. For the 48 V AC coil, that means it pulls in reliably down to approximately 38.4 V and holds in up to approximately 52.8 V."},{"question":"Will 3RT1944-5AH02 drop into a panel specified around 3RT1017-1AD02?","answer":"No. The 3RT1944-5AH02 is a magnet coil for Size S3 contactors, while the 3RT1017-1AD02 is a complete power contactor in Size S00. The coil will not physically fit the S00 frame, and the S00 contactor uses a different coil part number. You would need the correct coil for the S00 contactor, not this S3 coil."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1944-5AH02","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/3RT1944-5AH02 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}}