{"product_id":"square-d-mgl36300-300a-600v-3-pole-circuit-breaker","title":"Square D MGL36300 - 300 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D MGL36300 is a 300A, 600V, 3-pole molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. Built for demanding commercial and light industrial loads, it also serves as a robust option in larger residential installations where higher amperage and three-phase protection are essential.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWhy this breaker stands out\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded case design\u003c\/strong\u003e maximizes panel space, making it easier to fit even crowded distribution centers without sacrificing protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection across a range of temperatures and load conditions, helping prevent nuisance trips while still interrupting hazardous faults.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole configuration\u003c\/strong\u003e ideal for three-phase systems, enabling reliable protection for multi-wire circuits and three-phase equipment common in commercial and light industrial settings.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600V electrical rating\u003c\/strong\u003e supports higher-voltage distribution networks, expanding applicability beyond low-voltage residential panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e designed to align with matching Square D OEM loadcenters and panelboards, simplifying installation and ensuring reliable performance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical snapshot\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: \u003cstrong\u003eSquare D\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003ePart Number: \u003cstrong\u003eMGL36300\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eType: \u003cstrong\u003eThermal-magnetic molded case circuit breaker\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eAmperage Rating: \u003cstrong\u003e300A\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eVoltage Rating: \u003cstrong\u003e600V\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eNumber of Poles: \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eApplication: \u003cstrong\u003eBranch circuit overcurrent and short-circuit protection\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eIdeal applications and scenarios\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eCommercial service panels and light industrial distribution where 300A feeders are required\u003c\/li\u003e \u003cli\u003eUpgrading existing panels to improve protection for high-demand equipment and three-phase loads\u003c\/li\u003e \u003cli\u003eReplacement in compatible OEM loadcenters and panelboards to restore reliable trip protection\u003c\/li\u003e \u003cli\u003eInstallation in environments where space efficiency and dependable thermal-magnetic protection are priorities\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePractical tips for selection and use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eEnsure your panelboard or loadcenter is designed for a \u003cstrong\u003e3-pole, 300A, 600V\u003c\/strong\u003e device and compatibility with the \u003cstrong\u003eMGL\u003c\/strong\u003e family.\u003c\/li\u003e \u003cli\u003eMatch the breaker to the panel’s intended protection level and bus bar configuration to avoid fitment or timing issues during operation.\u003c\/li\u003e \u003cli\u003eUse in applications where stable protection under varying loads minimizes nuisance trips and protects downstream equipment from short circuits.\u003c\/li\u003e \u003cli\u003eFor maintenance, verify that connections remain secure and that the breaker remains within its rated voltage and current range to maintain reliable protection over time.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the Square D \u003cstrong\u003eMGL36300\u003c\/strong\u003e, you get a purpose-built solution that balances compact design, precise thermal-magnetic protection, and OEM compatibility. It’s a dependable choice for safeguarding larger circuits in panelboards and loadcenters across residential, commercial, and light industrial environments.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355344916642,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-mgl36300-300-a-600-v-3-pole-circuit-breaker-ampstate-487.webp?v=1788751292","url":"https:\/\/www.ampstate.com\/products\/square-d-mgl36300-300a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}