{"product_id":"square-d-mhl36300-300a-3-pole-circuit-breaker","title":"Square D MHL36300 - 300 A, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D MHL36300, a 300A, 3-pole molded case circuit breaker designed to safeguard your panelboards and loadcenters with precision and reliability. Available through AmpState, this breaker sits at the heart of your electrical distribution, delivering dependable overcurrent and short-circuit protection where it matters most.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded case design\u003c\/strong\u003e optimizes panel space, helping you fit more protection in tighter enclosures without compromising performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection for both overloads and short circuits, reducing nuisance trips and promoting consistent electrical coordination.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole configuration\u003c\/strong\u003e is ideal for 3-phase systems, making it a solid choice for commercial and light industrial applications as well as specific residential setups that require 3-phase protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e300A rating\u003c\/strong\u003e provides robust main or feeder protection for larger distribution panels, supporting demanding equipment without sacrificing safety margins.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e design ensures seamless integration with matching Square D load centers and panelboards, so installation and replacement feel straightforward and reliable.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for \u003cem\u003eresidential, commercial, and light industrial\u003c\/em\u003e environments, giving you a single solution that adapts to multiple project requirements.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhy this matters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn any distribution panel, the right breaker isn’t just about breaking the circuit—it’s about coordinated protection that you can count on under real-world conditions. The MHL36300’s thermal-magnetic trip mechanism responds quickly to faults and heat build-up, helping protect conductors, equipment, and people. Its sturdy molded-case construction stands up to routine panel maintenance and dense wiring environments found in busy facilities.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eTechnical snapshot\u003c\/strong\u003e\u003c\/p\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 MHL36300\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\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePractical use cases\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eInstalling or upgrading a commercial panelboard that serves multiple motors, lighting banks, and power feeds for HVAC and conveyors—where 3-phase protection and high current carrying capacity are essential.\u003c\/li\u003e \u003cli\u003eUpgrading a main feeder or subpanel where space is at a premium and you need a compact, reliable 3-pole solution that won’t compromise protection.\u003c\/li\u003e \u003cli\u003eResidential projects with 3-phase service requirements or specialized equipment protection in workshops and small-scale commercial spaces.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eChoosing the Square D MHL36300…\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eEnsures \u003cstrong\u003ecompatibility with OEM load centers and panelboards\u003c\/strong\u003e for a dependable, plug-and-play replacement or installation.\u003c\/li\u003e \u003cli\u003eDelivers \u003cstrong\u003eclear protection goals\u003c\/strong\u003e with a reliable thermal-magnetic trip profile designed for real-world load patterns.\u003c\/li\u003e \u003cli\u003eProvides \u003cstrong\u003espace-efficient protection\u003c\/strong\u003e in panels where every inch counts, without sacrificing performance or safety.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eInvest in the MHL36300 300A 3-pole molded case circuit breaker for a thoughtful blend of durability, compatibility, and precise protection. Whether you’re stocking an electrical contractor’s toolkit or equipping a facility’s distribution panel, this Square D breaker from AmpState is built to perform when it matters most.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355347308706,"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-mhl36300-300-a-3-pole-circuit-breaker-ampstate-breakers-779.webp?v=1788751463","url":"https:\/\/www.ampstate.com\/products\/square-d-mhl36300-300a-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}