{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1646-1AG21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1646-1AG21","canonicalUrl":"https://aoctrl.com/siemens/3RT1646-1AG21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1646-1AG21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1 series, capacitor switching contactor, AC-6 50 kVAr/400V, 110 V 50/60 Hz coil, 3-pole, size S3, screw connection.","salesMarkdown":"## Capacitor switching contactor for power factor correction banks The Siemens 3RT1646-1AG21 is a capacitor switching contactor from the SIRIUS 3RT1 series, rated AC-6 at 50 kVAr at 400 V. This three-pole size S3 contactor uses a 110 V AC coil rated for 50/60 Hz and terminates via screw connections. The AC-6 rating means it is designed specifically for switching capacitor banks in power factor correction (PFC) panels — the inrush current from charging capacitors can exceed steady-state current by a factor of 20 to 50, and this contactor's damping resistors and contact material are selected to handle that repetitive surge without welding. The 110 V coil draw at 50 Hz is roughly 50 VA inrush, 10 VA hold — verify the control transformer in the PFC panel has headroom for the inrush if multiple contactors pull in simultaneously. The integrated damping resistors are wired in series with the main contacts for the first few milliseconds of closure; they must be allowed to cool between switching cycles — minimum off-time per the application note is 60 seconds for full thermal recovery.","metaTitle":"Siemens 3RT1646-1AG21 Capacitor Switching Contactor, AC-6 50","metaDescription":"Siemens 3RT1646-1AG21 capacitor switching contactor, AC-6 50 kVAr at 400 V, 110 V coil, 3-pole, size S3, screw connection. Lifecycle stage current. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current"}},"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=442482&mlfb=3RT1646-1AG21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1646-1AG21/alternatives.json"},"ai":{"faq":[{"question":"What is the AC-6 rating on this contactor?","answer":"The AC-6 rating is 50 kVAr at 400 V, which is the standard utilization category for capacitor switching. This covers typical 50 kVAr capacitor bank steps in 400 V power factor correction systems."},{"question":"Where can I buy 3RT1646-1AG21?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What coil voltage does this contactor use?","answer":"The coil is rated 110 V AC, 50/60 Hz. It is not a DC coil variant, so verify the control supply in your panel is AC."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1646-1AG21","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/3RT1646-1AG21 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}}