{"product_id":"square-d-mjl36450-450a-600v-3-pole-circuit-breaker","title":"Square D MJL36450 - 450 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D MJL36450—a robust 450 A, 600 V, 3-pole molded‑case circuit breaker designed to protect your panelboards and load centers with precision and reliability. Built to endure demanding branch‑circuit overcurrent and short‑circuit events, this unit helps keep electrical systems safe in everyday residential, commercial, and light industrial applications.\u003c\/p\u003e \u003ch2\u003eWhy this breaker stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded‑case design\u003c\/strong\u003e maximizes panel space without sacrificing protection, making it easier to fit into tight panels and accommodate additional circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal‑magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection performance across a range of loads and fault conditions, reducing nuisance trips while ensuring fast response when it matters most.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM‑level compatibility\u003c\/strong\u003e engineered to work with matching Square D load centers and panelboards, ensuring dependable replacement and seamless integration in your existing electrical infrastructure.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh‑capacity protection\u003c\/strong\u003e 450 A rating at 600 V provides robust protection for sizable branch circuits feeding motors, HVAC equipment, lighting panels, and other critical loads.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhat it protects and why it matters\u003c\/h2\u003e\n\u003cp\u003eThe MJL36450 is purpose‑built for branch circuit overcurrent and short‑circuit protection. By interrupting excessive current before wiring or devices overheat, it helps prevent insulation damage, fire risk, and equipment failure. Its three‑pole design is ideal for three‑phase systems, delivering coordinated protection across all conductors.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eReplacing aging or failed circuit breakers in Square D panelboards and load centers that require a 450 A, 3‑pole solution.\u003c\/li\u003e \u003cli\u003ePermanent installations in commercial spaces where large, three‑phase loads (machinery, pumps, HVAC, power distribution) demand reliable protection.\u003c\/li\u003e \u003cli\u003eResidential‑light industrial applications where compact packaging and high‑amperage protection are needed in a single, convenient unit.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical snapshot\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\u003cstrong manufacturer\u003e: Square D\u003c\/strong\u003e\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: MJL36450\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: 450 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating\u003c\/strong\u003e: 600 V\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 \u003ch2\u003eShop with confidence\u003c\/h2\u003e\n\u003cp\u003eAvailable from AmpState, this genuine Square D MJL36450 breaker is a trustworthy choice for professionals seeking authentic components, consistent performance, and compatible replacement parts for Square D systems. Whether you’re upgrading a panel in a commercial space or reinforcing a residential distribution setup, this 3‑pole breaker delivers the protection you rely on when it counts.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355348783266,"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-mjl36450-450-a-600-v-3-pole-circuit-breaker-ampstate-914.webp?v=1788751642","url":"https:\/\/www.ampstate.com\/products\/square-d-mjl36450-450a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}