{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1935-5AU61","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1935-5AU61","canonicalUrl":"https://aoctrl.com/siemens/3RT1935-5AU61","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1935-5AU61","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Magnet coil, 3RT1935-5AU61, Size S2, screw terminal, 277 V AC, 60 Hz.","salesMarkdown":"It's the coil you'd order when the original in a SIRIUS S2 contactor fails — same footprint, same mounting, direct swap. This means while it's still available through distribution channels, it's not a long-term production part. If you're designing a new panel, the 3RT2 series coil is the forward path. Rated at 277 V AC, 60 Hz — that's a North American line-to-neutral voltage on a 480Y/277 V system. The 60 Hz spec is fixed; a 50 Hz coil won't pull in reliably on this winding. Screw terminals match the existing SIRIUS S2 contactor base, so no re-termination or adapter needed. Size S2 covers contactors in the 38–65 A AC-3 range, so this coil is sized for that mechanical stroke and holding force. ## Panel Integration The coil mounts directly onto the SIRIUS S2 contactor — no additional bracket or wiring harness. Screw terminals accept the same ring or fork terminals as the original. If you're replacing a failed coil in an existing panel, verify the contactor base is SIRIUS Size S2; the 3RT2 successor uses a different mechanical interface and won't interchange.","metaTitle":"Siemens 3RT1935-5AU61 SIRIUS Magnet Coil, 277 V AC 60 Hz, Si","metaDescription":"Siemens SIRIUS 3RT1935-5AU61 magnet coil for Size S2 contactors. 277 V AC, 60 Hz, screw terminal. Lifecycle: current. Phased-out; successor 3RT2 series. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current","Product Brand Name":"SIRIUS","Product Designation":"Magnet coil"}},"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=296460&mlfb=3RT1935-5AU61","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1935-5AU61/alternatives.json"},"ai":{"faq":[{"question":"What replaces 3RT1935-5AU61?","answer":"The official successor is the SIRIUS 3RT2 series magnet coil. Check the 3RT2 catalog for a 277 V AC 60 Hz winding in the equivalent Size S2 frame."},{"question":"Where can I buy 3RT1935-5AU61?","answer":"We source this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment."},{"question":"What voltage and frequency does 3RT1935-5AU61 require?","answer":"277 V AC at 60 Hz. This is a fixed-frequency winding — not suitable for 50 Hz supplies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1935-5AU61","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/3RT1935-5AU61 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}}