{"product_id":"square-d-lja36400u54x-400a-3-pole-plug-in-circuit-breaker","title":"Square D LJA36400U54X - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D LJA36400U54X is a 400 A, 3-pole plug-in molded case circuit breaker engineered to shield your most demanding branch circuits in panelboards and loadcenters. Designed for rapid installation and dependable protection, this unit delivers reliable thermal-magnetic trimming for residential, commercial, and light industrial environments.\u003c\/p\u003e \u003ch3\u003eKey benefits that matter in real-world setups\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e enables quick installation and effortless replacement, reducing panel downtime during service or upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection against both overloads and short circuits, helping minimize nuisance trips while safeguarding valuable equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible compatibility\u003c\/strong\u003e coordinates with matching Square D loadcenters and panelboards for a consistent fit and predictable trip performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole design\u003c\/strong\u003e delivers balanced protection across three phases, essential for equipment and motors in commercial and light industrial applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh current capability\u003c\/strong\u003e with a 400 A rating, suitable for large branch circuits, feeders, and main distribution paths within compatible panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePlug-in mounting\u003c\/strong\u003e simplifies installation, retrofit, and maintenance in existing Square D systems without complex wiring changes.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eProduct details at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Square D\u003c\/li\u003e \u003cli\u003ePart Number: LJA36400U54X\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: 400 A\u003c\/li\u003e \u003cli\u003eNumber of Poles: 3\u003c\/li\u003e \u003cli\u003eMounting Style: Plug-in\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal usage scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eUpgrading or replacing breakers in existing Square D panelboards and loadcenters where a 400 A, 3-pole solution is required\u003c\/li\u003e \u003cli\u003eProviding robust protection for large-capacity feeders feeding critical equipment in commercial spaces\u003c\/li\u003e \u003cli\u003eProtecting three-phase motor circuits and heavy loads in light industrial environments\u003c\/li\u003e \u003cli\u003eNew installations that demand quick, reliable plug-in protection with OEM-wide compatibility\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this breaker stands out\u003c\/h3\u003e\n\u003cp\u003eCompared to other mounting approaches, the plug-in design of the LJA36400U54X minimizes configuration complexity and service interruption. The molded case construction offers durable insulation and reliable fault isolation, while the thermal-magnetic trip system ensures precise, predictable responses to overloads and short circuits. If you need a dependable, high-capacity solution that cleanly integrates with existing Square D panels, this 400 A, 3-pole unit is purpose-built to keep systems online and protected.\u003c\/p\u003e \u003cp\u003eCompatible, efficient, and purpose-driven—the Square D LJA36400U54X is engineered to deliver consistent performance where it matters most: in the protection of your most valuable electrical infrastructure.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355325124770,"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_c91b8b9d-07fa-47b3-82a7-b5db9799c5ea.png?v=1764691347","url":"https:\/\/www.ampstate.com\/products\/square-d-lja36400u54x-400a-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}