{"product_id":"square-d-lla36400u43x-400a-3-pole-plug-in-circuit-breaker","title":"Square D LLA36400U43X - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing the Square D LLA36400U43X — a 400A, 3-pole plug-in molded case circuit breaker built to shield panelboards and load centers from overcurrent and short circuits. Its fast plug-in connection minimizes install time and downtime during replacements, while the thermal-magnetic trip unit delivers stable, repeatable protection across varying loads and temperatures.\u003c\/p\u003e \u003cp\u003eDesigned for demanding environments, this breaker is compatible with matching OEM load centers and panelboards, ensuring seamless integration in residential, commercial, and light industrial applications.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e400A, 3-pole plug-in molded case design:\u003c\/strong\u003e robust interrupting capability for large feeders and service panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection:\u003c\/strong\u003e simplifies installation and quick replacement without special tools or field fabrication.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit:\u003c\/strong\u003e provides reliable overload protection (thermal) and immediate short-circuit protection (magnetic), delivering consistent trip performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e engineered to fit OEM panelboards and load centers designed for plug-in breakers of this family and rating.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile across sectors:\u003c\/strong\u003e suitable for residential, commercial, and light industrial electrical systems, including data rooms, workshops, and small manufacturing setups.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eUse cases and scenarios:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eUpgrade or replace aging or tripped breakers in a service or distribution panel where a 400A, three-pole protection is required.\u003c\/li\u003e \u003cli\u003eInstall as part of a new main distribution panel serving large feeders or subpanels in commercial spaces, light industrial facilities, or electrical closets.\u003c\/li\u003e \u003cli\u003eMaintenance-friendly choice for facilities that prioritize quick swaps during panel servicing to minimize downtime.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhy choose this Square D breaker over alternatives:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003ePlug-in mounting reduces field wiring and alignment hassles compared to bolt-on options, making service calls smoother.\u003c\/li\u003e \u003cli\u003eThe thermal-magnetic trip curve delivers dependable performance in a wide range of loads, helping avoid nuisance trips while protecting equipment from damage.\u003c\/li\u003e \u003cli\u003eOEM compatibility means you can trust reliable panel integration and consistent trip characteristics with matching Square D products.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePractical notes for procurement and installation:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003ePart number: LLA36400U43X\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e \u003cli\u003eMounting style: Plug-in\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the Square D LLA36400U43X, you get a high-capacity, plug-in protection solution that keeps critical circuits safeguarded and downtime minimal. Ready to install in compatible panelboards, this 3-pole breaker is a dependable choice for professionals who demand clarity, speed, and reliability in one package.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355327352994,"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-lla36400u43x-400-a-3-pole-plug-in-circuit-breaker-ampstate-425.webp?v=1788750817","url":"https:\/\/www.ampstate.com\/products\/square-d-lla36400u43x-400a-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}