{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT5945-5AF01","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT5945-5AF01","canonicalUrl":"https://aoctrl.com/siemens/3RT5945-5AF01","factsUrl":"https://aoctrl.com/api/mcp/products/3RT5945-5AF01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Magnet coil, 3RT5945-5AF01, 110 V AC 50 Hz, screw terminal.","salesMarkdown":"The Siemens 3RT5945-5AF01 is a SIRIUS replacement magnet coil for the 3RT series of power contactors. It is the field-replaceable solenoid that pulls the contactor armature in, rated for 110 V AC control supply at 50 Hz. The coil accepts a voltage tolerance of 0.8 to 1.1 times the rated value, meaning it holds in reliably from about 88 V to 121 V AC — a standard operating band for industrial control transformers that sag under load. ## Integration into the contactor Connection is via screw terminals, matching the standard 3RT contactor coil termination. The coil mounts onto the contactor magnet system; no DIN-rail space consumed beyond the contactor itself. For a panel OEM or MRO planner, this is a direct swap part — same footprint, same wiring scheme as the original coil shipped with the contactor.","metaTitle":"Siemens 3RT5945-5AF01 SIRIUS Magnet Coil, 110 V AC 50 Hz","metaDescription":"Siemens SIRIUS 3RT5945-5AF01 replacement magnet coil for 3RT contactors. Rated 110 V AC 50 Hz, screw terminals. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"title":"3RT5945-5AF01","at 50 Hz":"0.8 ... 1.1","description":"Magnetic coil for contactor Magnetic coil for contactor 3RT504 US:110 V AC 50 Hz screw terminal","lifecycle_stage":"current","Product Brand Name":"SIRIUS","Product Designation":"Magnet coil","at 50 Hz rated value":"110 V","Type Of Voltage Of The Control Supply Voltage":"AC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/351d07cf243232b299f391e618ba51d2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=580087&mlfb=3RT5945-5AF01"},"ai":{"faq":[{"question":"What is the rated voltage and frequency for 3RT5945-5AF01?","answer":"It is rated 110 V AC at 50 Hz, with an operating tolerance of 0.8 to 1.1 times the rated voltage (approximately 88 V to 121 V AC)."},{"question":"Where can I buy 3RT5945-5AF01 and how is it quoted?","answer":"This coil is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"Will 3RT5945-5AF01 fit a contactor originally built with a different coil?","answer":"It is a direct replacement coil for 3RT series contactors that use a 110 V AC 50 Hz coil with screw terminals. No rewiring or adapter needed if the contactor frame accepts this coil variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT5945-5AF01","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/3RT5945-5AF01 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}