{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1934-5AM21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1934-5AM21","canonicalUrl":"https://aoctrl.com/siemens/3RT1934-5AM21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1934-5AM21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, magnet coil, 3RT1934-5AM21, 208 V AC, 50/60 Hz, for Size S2 contactors, screw terminal.","salesMarkdown":"The Siemens 3RT1934-5AM21 is a SIRIUS magnet coil — the solenoid that pulls in and holds the main contacts of a Size S2 contactor. It is wound for 208 V AC control voltage and works on both 50 Hz and 60 Hz supplies, drawing a pick-up apparent power of 27 V·A and a holding apparent power of 4.4 V·A (typical for the S00/S0 coil family). The screw terminals match the contactor's control-circuit wiring; strip length and ferrule sizing follow the same 0.2–2.5 mm² range as the main power terminals. The 208 V AC coil voltage is the only control voltage variant on this order code — it is not a multi-tap coil. If your panel's control transformer delivers 208 V line-to-line or line-to-neutral (common in North American 208Y/120 V systems), this coil pulls in reliably. The 50/60 Hz dual-frequency rating means the same coil works on either supply without derating. The screw terminal design matches the SIRIUS Size S2 contactor base; no adapter or wiring harness is needed. The coil snaps onto the Size S2 contactor magnet system. Side spacing to grounded parts is 6 mm minimum. The IP20 finger-safe terminal cover is standard for the control circuit. For a panel-builder, the coil swap takes under a minute — no need to disconnect the main power wiring.","metaTitle":"Siemens 3RT1934-5AM21 SIRIUS Magnet Coil, 208 V AC, 50/60 Hz","metaDescription":"Siemens 3RT1934-5AM21 SIRIUS magnet coil for Size S2 contactors, 208 V AC 50/60 Hz. Phased-out; successor is SIRIUS 3RT2. Sourced to order against RFQ.","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":"208 V","at 60 Hz rated value":"208 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=299960&mlfb=3RT1934-5AM21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1934-5AM21/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1934-5AM21?","answer":"We source this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1934-5AM21","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/3RT1934-5AM21 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}}