{"product_id":"siemens-q21550ct2-circuit-breaker","title":"Siemens | Q21550CT2 | Circuit Breaker | 4-Pole","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSiemens Q21550CT2 4-Pole Circuit Breaker\u003c\/strong\u003e is a robust, factory-rated protective device designed for maintenance, retrofit, and replacement projects where exact specs matter. Built to meet Siemens’ precise performance standards, this breaker helps safeguard electrical systems in commercial and industrial environments.\u003c\/p\u003e \u003cp\u003eDesigned for multi-wire and multi-phase installations, the \u003cstrong\u003e4-pole\u003c\/strong\u003e configuration ensures reliable fault isolation and coordinated protection across connected circuits. This makes it a reliable choice when upgrading panels, replacing aging components, or performing routine maintenance where exact compatibility is essential.\u003c\/p\u003e \u003ch3\u003eKey details\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 4-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e Q21550CT2\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFit \u0026amp; compatibility:\u003c\/strong\u003e Confirm fit and ratings before ordering; the part number is the best reference for compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this Siemens breaker stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eExact-match compatibility with Siemens panels and assemblies that require a 4-pole protective device, ensuring seamless integration and consistent protection.\u003c\/li\u003e \u003cli\u003eAdheres to Siemens’ documented trip and protection characteristics, providing predictable performance across routine maintenance and fault conditions.\u003c\/li\u003e \u003cli\u003eOptimized for retrofit and replacement scenarios, reducing guesswork and downtime when restoring critical power distribution.\u003c\/li\u003e \u003cli\u003eDurable construction designed for dependable service in demanding commercial and light-industrial environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePanel upgrades in facilities with legacy Siemens systems that require a precise 4-pole device.\u003c\/li\u003e \u003cli\u003eService-ready spare part for maintenance teams performing replacements in commercial or industrial electrical rooms.\u003c\/li\u003e \u003cli\u003eRetrofit projects where a four-pole protection strategy is needed to properly isolate multi-phase circuits and protect downstream equipment.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical guidance for purchasing and installation\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, verify the panel’s compatibility by cross-checking the \u003cstrong\u003eQ21550CT2\u003c\/strong\u003e with your panel’s catalog and the existing breaker’s specifications. Use the part number as the primary reference for matching compatibility. When installing, follow standard electrical safety practices and local codes to ensure a safe, reliable replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46426716274850,"sku":"Q21550CT2","price":224.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_16d3a2fb-5d93-424c-9206-5031ec4b178f.png?v=1765492977","url":"https:\/\/www.ampstate.com\/products\/siemens-q21550ct2-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}