{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1945-5AB02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1945-5AB02","canonicalUrl":"https://aoctrl.com/siemens/3RT1945-5AB02","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1945-5AB02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1945-5AB02 magnet coil, 24 V AC 50 Hz, spring-loaded connection, for Size S3 contactors.","salesMarkdown":"## Lifecycle and replacement This coil is a phased-out product. The manufacturer lists the successor as the SIRIUS 3RT2 series. For a BOM freeze or line-down replacement, the 3RT2 equivalent is the cross-reference to specify. The coil's operating range of 0.8... 1.1 times the rated voltage (24 V AC) means it picks up reliably between about 19.2 V and 26.4 V at 50 Hz. That's the window the contactor's magnetic circuit needs to close fully; outside that range the coil may chatter or fail to seal. ## Panel integration Spring-loaded connection technology — no screwdriver needed for the control wiring. That's another SKU I don't need for termination hardware.","metaTitle":"Siemens 3RT1945-5AB02 SIRIUS Magnet Coil, 24 V AC 50 Hz","metaDescription":"Siemens 3RT1945-5AB02 SIRIUS magnet coil for Size S3 contactors. 24 V AC, 50 Hz, spring-loaded connection. Phased-out product; successor is SIRIUS 3RT2. Sourced 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":"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=252905&mlfb=3RT1945-5AB02","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1945-5AB02/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1945-5AB02?","answer":"The official successor is the SIRIUS 3RT2 series coil for Size S3 contactors. The 3RT1026-1AB00 is a different frame size (S0) and uses screw terminals — it won't drop into a panel wired for S3 without mechanical and wiring changes."},{"question":"What is the operating voltage range for 3RT1945-5AB02?","answer":"The coil operates at 0.8 to 1.1 times the rated 24 V AC at 50 Hz, so it picks up between roughly 19.2 V and 26.4 V."},{"question":"Where can I buy 3RT1945-5AB02?","answer":"We source this phased-out coil to order against an RFQ through independent distribution. Submit a quote request for current availability and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1945-5AB02","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/3RT1945-5AB02 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}}