{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1934-5BD42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1934-5BD42","canonicalUrl":"https://aoctrl.com/siemens/3RT1934-5BD42","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1934-5BD42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, magnet coil, 3RT1934-5BD42, 42 V DC, spring-loaded connection technology, Size S2.","salesMarkdown":"The Siemens 3RT1934-5BD42 is a SIRIUS-brand magnet coil designed for Size S2 contactors. It's a 42 V DC coil with spring-loaded connection technology — the kind of replaceable coil you swap when the control voltage changes or the old one lets go out here in the grease. This part is listed as a phased-out product. The official successor is the SIRIUS 3RT2 series — same Size S2 footprint, same spring-loaded connection, but the 3RT2 coil family. Availability and current pricing get confirmed at quote time. This coil snaps into a SIRIUS Size S2 contactor — the same frame that carries the 3RT1044 and similar power contactors. The 42 V DC rating means it pulls in clean on a 48 V nominal bus with a drop-out below about 34 V; verify your control transformer tap before committing the line. ## Why This Coil Matters on the Route A magnet coil is the part that takes the hit — every time the contactor cycles, that coil takes the inrush and the heat. On a conveyor line or a pump panel that cycles a few hundred times an hour, having the right DC coil voltage (42 V here) keeps the contactor from chattering or dropping out early. The spring-loaded connection means you're not fighting screw terminals when you swap it in a tight enclosure; strip 8 mm, push it in, done.","metaTitle":"Siemens 3RT1934-5BD42 SIRIUS Magnet Coil, 42 V DC, Spring-Lo","metaDescription":"Siemens 3RT1934-5BD42 SIRIUS magnet coil, 42 V DC, spring-loaded connection for Size S2 contactors. Phased-out — successor is SIRIUS 3RT2. 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","1 at DC rated value":"42 V","Product Designation":"Magnet coil","Type Of Voltage Of The Control Supply Voltage":"DC"}},"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=126658&mlfb=3RT1934-5BD42","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1934-5BD42/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RT1934-5BD42 and get a price?","answer":"We source it to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ and we'll come back with a number and lead time."},{"question":"What replaces the 3RT1934-5BD42?","answer":"The official successor is the SIRIUS 3RT2 series magnet coil for Size S2 contactors. Same spring-loaded connection, same physical fit."},{"question":"Will this coil drop into a panel wired for a 3RT1016-1BB42?","answer":"No — the 3RT1016-1BB42 is a Size S00 power contactor with screw terminals and a 24 V DC coil. The 3RT1934-5BD42 is a Size S2 coil at 42 V DC with spring-loaded connections. The frame sizes and mounting rails differ; you'd need the matching Size S2 contactor body."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1934-5BD42","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/3RT1934-5BD42 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}}