{"product_id":"square-d-mx36300-circuit-breaker","title":"Square D | MX36300 | Circuit Breaker | 300A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D MX36300 circuit breaker—a robust, high-current solution designed for demanding 600V electrical distributions. With a \u003cstrong\u003e300A\u003c\/strong\u003e rating and a \u003cstrong\u003e3-Pole\u003c\/strong\u003e configuration, this unit is built to reliably protect large feeders and essential machinery in industrial and commercial environments.\u003c\/p\u003e \u003cp\u003eDesigned for maintenance, retrofit, and replacement projects where exact compatibility matters, the \u003cstrong\u003eMX36300\u003c\/strong\u003e drops into Square D panels that call for the same specifications, ensuring consistent trip characteristics and dependable protection over time.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 300A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility note:\u003c\/strong\u003e The part number \u003cstrong\u003eMX36300\u003c\/strong\u003e is the best reference for matching panels and breakers\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this MX36300 makes sense for your system\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eExact fit for Square D panels that require MX36300, reducing guesswork during retrofits or replacements.\u003c\/li\u003e \u003cli\u003eThree-pole design supports balanced three-phase distribution, helping protect motors, compressors, and other high-current loads from overloads and faults.\u003c\/li\u003e \u003cli\u003eDurable construction designed for continuous operation in demanding environments, from manufacturing floors to large facilities.\u003c\/li\u003e \u003cli\u003eClear guidance for procurement: confirm fit and ratings before ordering to avoid compatibility issues in the field.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacing worn or damaged breakers in 3-phase \u003cstrong\u003e600V\u003c\/strong\u003e electrical systems.\u003c\/li\u003e \u003cli\u003eRetrofits that require exact \u003cstrong\u003eMX36300\u003c\/strong\u003e specifications to preserve panel protection profiles.\u003c\/li\u003e \u003cli\u003eNew installations in facilities that rely on Square D equipment and need a 300A, 3-pole, 600V breaker.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical tips for installers\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAlways verify that the panel and bus connections match the MX36300’s specs before purchasing.\u003c\/li\u003e \u003cli\u003eDuring replacement, power down the panel and follow lockout\/tagout procedures to ensure safe work.\u003c\/li\u003e \u003cli\u003eKeep the exact part number \u003cstrong\u003eMX36300\u003c\/strong\u003e on file for future maintenance to prevent mismatches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46426337116322,"sku":"MX36300","price":2010.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-mx36300-circuit-breaker-300a-3-pole-600v-587.webp?v=1789559487","url":"https:\/\/www.ampstate.com\/products\/square-d-mx36300-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}