{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1934-5BP42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1934-5BP42","canonicalUrl":"https://aoctrl.com/siemens/3RT1934-5BP42","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1934-5BP42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1934-5BP42, magnet coil for Size S2 contactors, 230 V DC, spring-loaded connection technology.","salesMarkdown":"The Siemens SIRIUS 3RT1934-5BP42 is a replacement magnet coil for Size S2 contactors in the SIRIUS family. It uses spring-loaded connection technology and is rated for 230 V DC control supply voltage. This coil is the drop-in service part for an existing S2 contactor frame — you swap the coil, not the whole contactor. This part is flagged as a phased-out product. The official successor is the SIRIUS 3RT2 series. For new designs or a panel respin, the 3RT2 series is the path forward. ## What the DC Coil Rating Means The 230 V DC coil is a continuous-duty solenoid. Unlike an AC coil, a DC coil does not have an inrush current spike — it draws steady holding current once sealed. That makes it easier on the control transformer and PLC output card driving it, but it also means the supply must hold steady at 230 V DC; a sag below the dropout threshold releases the contactor.","metaTitle":"Siemens 3RT1934-5BP42 SIRIUS Magnet Coil, 230 V DC, Spring-L","metaDescription":"Siemens SIRIUS 3RT1934-5BP42 magnet coil for Size S2 contactors. 230 V DC, spring-loaded connection. Phased-out; successor is SIRIUS 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","1 at DC rated value":"230 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=350814&mlfb=3RT1934-5BP42","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1934-5BP42/alternatives.json"},"ai":{"faq":[{"question":"What is the official replacement for this coil?","answer":"The official successor is the SIRIUS 3RT2 series. For a direct coil replacement in an existing S2 contactor, verify the frame size and voltage rating against the 3RT2 catalog."},{"question":"Will this coil work in a panel built around a 3RT1015-1BB42 contactor?","answer":"No. The 3RT1015-1BB42 is a Size S00 contactor, while this coil is for a Size S2 frame. The physical dimensions and mounting are incompatible without changing the entire contactor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1934-5BP42","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/3RT1934-5BP42 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}}