{"product_id":"square-d-lla36400u53x-400a-3-pole-plug-in-circuit-breaker","title":"Square D LLA36400U53X - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D LLA36400U53X—a \u003cstrong\u003e400 A, 3-pole plug-in molded case circuit breaker\u003c\/strong\u003e designed to deliver dependable branch circuit \u003cem\u003eovercurrent\u003c\/em\u003e and \u003cem\u003eshort-circuit protection\u003c\/em\u003e in panelboards and loadcenters. Built for reliable performance in demanding environments, this unit is a precise fit for three-phase distribution systems where safety and uptime matter.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eKey advantages at a glance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e for quick installation and straightforward replacements, minimizing downtime during panel maintenance or upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection by handling both overload conditions (thermal) and short-circuit events (magnetic) with decisive action.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole design\u003c\/strong\u003e ideal for three-phase applications, offering coordinated protection across all phases in your panelboard or loadcenter.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e engineered to pair with matching Square D load centers and panelboards, ensuring consistent performance and ease of integration.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile installation footprint\u003c\/strong\u003e suited for \u003cem\u003eresidential, commercial, and light industrial\u003c\/em\u003e applications where robust protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhat this means in real-world terms\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eIn a commercial office building, use the LLA36400U53X to protect main feeders and branch circuits from overloads and short circuits, helping prevent equipment damage and electrical fires.\u003c\/li\u003e \u003cli\u003eIn a light-industrial setting, rely on its 400 A rating to safeguard motors, feeders, and distribution panels without frequent nuisance trips.\u003c\/li\u003e \u003cli\u003eDuring a retrofit or panel upgrade, this plug-in breaker simplifies replacement in compatible Square D systems, reducing install time and compatibility concerns.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eHow it works\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe device combines a thermal element and magnetic trip to monitor current flow continuously. Under normal conditions, the breaker remains closed, allowing uninterrupted power. If a thermal overload develops, the thermal element gradually trips to prevent overheating. If a fault creates a sudden surge, the magnetic mechanism reacts quickly to interrupt current, protecting both conductors and connected equipment.\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 LLA36400U53X\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 400 A\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 \u003cp\u003eFor professionals prioritizing reliability and compatibility, the \u003cstrong\u003eSquare D LLA36400U53X\u003c\/strong\u003e represents a purpose-built solution that aligns with OEM panelboards and loadcenters. Choose it to ensure consistent protection across three-phase installations, streamline downtime when servicing panels, and maintain safer, code-compliant electrical distribution in residential, commercial, and light industrial environments.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355327451298,"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_c0784cfd-92f9-48c0-95b8-aec1d7374850.png?v=1764691368","url":"https:\/\/www.ampstate.com\/products\/square-d-lla36400u53x-400a-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}