{"product_id":"square-d-ljl36400u44x-400a-3-pole-circuit-breaker","title":"Square D LJL36400U44X - 400 A, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D LJL36400U44X is a 400A, 3-pole molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built to fit into OEM systems, this breaker helps protect electrical infrastructure with precision and reliability.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage and Poles:\u003c\/strong\u003e 400A rating with 3 poles for multi-branch protection and streamlined bus bar integration.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolded case design:\u003c\/strong\u003e Compact footprint that maximizes panel space while maintaining robust protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit:\u003c\/strong\u003e Delivers stable, repeatable protection by combining overload sensing with instantaneous short-circuit interruption.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility:\u003c\/strong\u003e Engineered to be compatible with matching Square D load centers and panelboards, supporting straightforward retrofits and new builds.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplications:\u003c\/strong\u003e Suitable for residential, commercial, and light industrial environments where reliable branch circuit protection is essential.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpecifications at a glance:\u003c\/strong\u003e Type — Thermal-magnetic molded case circuit breaker; Manufacturer — Square D; Part Number — LJL36400U44X; Application — Branch circuit overcurrent and short-circuit protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this Square D breaker stands out\u003c\/h3\u003e\n\u003cp\u003eIn electrical panels where space is at a premium, the LJL36400U44X’s compact molded case design helps you maximize usable panel area without sacrificing protection. The thermal-magnetic trip mechanism provides balanced protection across varying loads and conditions, reducing nuisance trips while ensuring fast response to dangerous faults. When you pair this unit with compatible OEM load centers and panelboards, you get seamless electrical coordination, dependable performance, and a streamlined maintenance path for both new installations and upgrades.\u003c\/p\u003e \u003ch3\u003eIdeal use scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eNew construction: Installing a dedicated 400A 3-pole main or feeder in commercial panelboards.\u003c\/li\u003e \u003cli\u003ePanel retrofit: Upgrading or replacing a failed breaker in existing Square D systems to maintain compatibility and protection standards.\u003c\/li\u003e \u003cli\u003eIndustrial light-duty applications: Protective device for feeder circuits supplying motors, transformers, and distribution loads within safe, code-compliant limits.\u003c\/li\u003e \u003cli\u003eResidential-commercial transitions: Systems that require a robust, high-capacity protection solution within centralized distribution panels.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eChoose the Square D LJL36400U44X when you need a trusted, high-capacity, OEM-compatible breaker that preserves panel space and delivers reliable protection for critical electrical infrastructure.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355326533794,"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_1ad8efd2-f9a5-4021-9a46-00c5b06062df.png?v=1764691358","url":"https:\/\/www.ampstate.com\/products\/square-d-ljl36400u44x-400a-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}