{"product_id":"square-d-mh36300-300a-3-pole-plug-in-circuit-breaker","title":"Square D MH36300 - 300 A, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D MH36300 is a 300A, 3‑pole plug‑in molded case circuit breaker engineered for dependable branch circuit overcurrent and short‑circuit protection in panelboards and load centers. Built to simplify service and upgrades, it delivers robust protection where it matters most—across residential, commercial, and light industrial applications.\u003c\/p\u003e \u003ch2\u003eWhy this MH36300 stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e for quick installation and streamlined replacements, reducing downtime during upgrades or service calls.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal‑magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection performance, responding to overloads with the thermal element and delivering instantaneous action for short circuits via the magnetic element.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3‑pole, 300A rating\u003c\/strong\u003e suited for three‑phase systems and high current branch circuits, delivering reliable protection for demanding loads.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e designed to work with matching Square D OEM load centers and panelboards, ensuring proper coordination and fitment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile installation\u003c\/strong\u003e plug‑in mounting supports a wide range of panelboard configurations, making it a practical choice for both new builds and panel upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIdeal for multiple sectors\u003c\/strong\u003e from homes and small businesses to light industrial facilities that require solid, code‑compliant protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhat problems it solves\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eEliminates lengthy wiring work with a plug‑in design, accelerating maintenance and replacements.\u003c\/li\u003e \u003cli\u003eProvides dependable protection against overloads and short circuits, helping prevent equipment damage and electrical fires.\u003c\/li\u003e \u003cli\u003eEnsures system protection remains coordinated with OEM panelboards, reducing compatibility concerns during upgrades.\u003c\/li\u003e \u003cli\u003eSupports high‑demand applications where a 300A, three‑pole solution is required for safe, continuous operation.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWho this is ideal for\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eFacilities updating or expanding panelboards or load centers that require a 300A, 3‑pole plug‑in breaker.\u003c\/li\u003e \u003cli\u003eElectrical professionals performing retrofits in residential, commercial, or light industrial settings.\u003c\/li\u003e \u003cli\u003eProjects needing reliable, repeatable thermal‑magnetic protection with quick replacement capabilities.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Square D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e MH36300\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal‑magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage Rating:\u003c\/strong\u003e 300A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Plug‑in\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short‑circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eUsage tips and best practices\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eVerify compatibility with your panelboard or load center’s rated frame and bus configuration before installation.\u003c\/li\u003e \u003cli\u003eWhen servicing, consider the plug‑in design to minimize downtime—have a replacement breaker ready for a quick swap.\u003c\/li\u003e \u003cli\u003eUse as part of a coordinated protection scheme to ensure consistent trip characteristics across all circuit protections in the system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355345440930,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/schnieder_and_square_d_breaker_and_panel_0414d06c-7550-4a7a-b828-96cd932c1ce8.png?v=1764691432","url":"https:\/\/www.ampstate.com\/products\/square-d-mh36300-300a-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}