{"product_id":"square-d-lla36400u33x-400a-600v-3-pole-plug-in-circuit-breaker","title":"Square D LLA36400U33X - 400 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D \u003cstrong\u003eLLA36400U33X\u003c\/strong\u003e, a robust 400 A, 600 V, 3-pole plug-in molded case circuit breaker designed to shield branch circuits in panelboards and load centers. Built for dependable overcurrent and short-circuit protection, this unit combines fast installation with precise protection that electricians trust in residential, commercial, and light industrial settings.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current, high-voltage protection\u003c\/strong\u003e: 400 A amperage rating and 600 V capacity safeguard powerful electrical loads without compromising safety.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole, plug-in design\u003c\/strong\u003e: Simplified, quick-to-install plug-in connection to compatible OEM panelboards and load centers, minimizing downtime during upgrades or replacements.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e: Delivers stable, repeatable protection by combining thermal overcurrent sensing with magnetic instantaneous tripping for fast response to short circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e: Engineered to fit matching Square D load centers and panelboards, ensuring reliable mechanical and electrical compatibility.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e: Ideal for residential service panels, commercial panels, and light industrial distribution where dependable branch circuit protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this matters\u003c\/h3\u003e\n\u003cp\u003eIn any electrical system, the right circuit breaker not only stops faults quickly but also maintains safe operation under varying conditions. The LLA36400U33X’s thermal-magnetic trip curve provides predictable behavior across ambient temperatures, long-term stability, and consistent trip characteristics. Its plug-in format reduces installation complexity and downtime—keeping projects on schedule and service calls efficient.\u003c\/p\u003e \u003ch3\u003eUse cases and scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eUpgrading a residential main panel to accommodate higher-capacity circuits without rewiring the enclosure\u003c\/li\u003e \u003cli\u003eReplacing aging breakers in commercial load centers to restore reliable feeder protection\u003c\/li\u003e \u003cli\u003eInstalling in light industrial panels to manage multiple large loads with coordinated protection\u003c\/li\u003e \u003cli\u003eSpecifying a plug-in breaker for new installations where fast deployment and future upgrades are anticipated\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eSpecs at a glance\u003c\/h3\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 LLA36400U33X\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 \u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600 V \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\u003eWhether you’re upgrading an existing panel or equipping a new installation, AmpState’s Square D LLA36400U33X delivers reliable protection with a straightforward plug-in approach. Choose this 3-pole, 400 A breaker for solid, long-lasting performance in the environments that demand it most.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355326992546,"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_d419c3aa-2e95-4ada-a6a7-fb34618ab5ac.png?v=1764691365","url":"https:\/\/www.ampstate.com\/products\/square-d-lla36400u33x-400a-600v-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}