{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1944-5AB02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1944-5AB02","canonicalUrl":"https://aoctrl.com/siemens/3RT1944-5AB02","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AB02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1944-5AB02 magnet coil, Size S3, 24 V AC 50 Hz, spring-loaded connection technology.","salesMarkdown":"The Siemens 3RT1944-5AB02 is a SIRIUS magnet coil designed for Size S3 contactors, providing the electromagnetic actuation that pulls in and holds the contactor's main and auxiliary contacts. It operates on a 24 V AC control supply at 50 Hz, with a rated operating range of 0.8 to 1.1 times the rated voltage — meaning the coil reliably picks up and seals in at voltages between about 19.2 V and 26.4 V, and drops out below the lower threshold. The spring-loaded connection technology (cage clamp) accepts solid or ferruled stranded conductors without needing screw torque verification, which speeds panel wiring and resists vibration loosening. The coil mounts onto the Size S3 contactor frame via the standard Siemens snap-on interface — no tools needed for the coil swap. Strip length is 8 to 10 mm for the cage clamp. The coil adds no additional DIN-rail width; it sits within the contactor's existing footprint.","metaTitle":"Siemens 3RT1944-5AB02 SIRIUS Magnet Coil, 24 V AC 50 Hz, Spr","metaDescription":"Siemens 3RT1944-5AB02 SIRIUS magnet coil for Size S3 contactors. 24 V AC 50 Hz, spring-loaded connection. Phased-out; successor is 3RT2 series. Sourced to order against RFQ.","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":"24 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=384809&mlfb=3RT1944-5AB02","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1944-5AB02/alternatives.json"},"ai":{"faq":[{"question":"What is the 50 Hz rating on this coil?","answer":"The coil is rated for 24 V AC at 50 Hz, with an operating range of 0.8 to 1.1 times the rated voltage. This means it reliably picks up between about 19.2 V and 26.4 V, and drops out below the lower threshold."},{"question":"Where can I buy 3RT1944-5AB02?","answer":"This part is sourced to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead-time estimate."},{"question":"Will 3RT1944-5AB02 fit a panel built around 3RT1026-1AB00?","answer":"No. The 3RT1026-1AB00 is a Size S0 power contactor with screw terminals; the 3RT1944-5AB02 is a Size S3 magnet coil with spring-loaded connections. They are mechanically incompatible — different frame sizes and coil interfaces. The 3RT1944-5AB02 is a service spare for an existing Size S3 contactor, not a cross-reference for S0 contactors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1944-5AB02","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/3RT1944-5AB02 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}}