{"product_id":"square-d-lga36400u43x-400a-3-pole-plug-in-circuit-breaker","title":"Square D LGA36400U43X - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D \u003cstrong\u003eLGA36400U43X\u003c\/strong\u003e — a 400 A, 3-pole plug-in molded case circuit breaker built for dependable branch circuit overcurrent and short‑circuit protection in panelboards and load centers. Its fast plug-in connection makes installation and replacements quick and simple, reducing downtime and keeping critical power flowing where you need it most. The thermal-magnetic trip unit delivers stable, repeatable protection, so you get predictable responses to overloads and faults without unnecessary trips.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in installation\u003c\/strong\u003e — slide-in mounting for rapid service upgrades and effortless replacements, minimizing panel downtime.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic protection\u003c\/strong\u003e — precise trip characteristics that respond to both overloads and short circuits, helping protect wiring and connected equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e — designed to pair with matching Square D OEM load centers and panelboards, preserving system integrity and UL compliance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current capability\u003c\/strong\u003e — 400 A rating suits larger residential feeders, commercial panels, and light industrial applications requiring robust protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole design\u003c\/strong\u003e — provides coordinated protection for three-phase circuits, enhancing safety and reliability in multi‑phase systems.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThis breaker is ideal for upgrading or expanding panel infrastructure where a reliable 400 A, 3‑pole plug-in solution is needed. Use it as a main feeder protection in larger residential subpanels, as a primary safeguard in commercial panelboards, or for retrofit projects where quick plug-in compatibility and durable performance matter most.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eSpecifications at a glance\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 LGA36400U43X\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\u003eChoose the Square D LGA36400U43X when you need a robust, plug-in solution that pairs with your existing panelboard ecosystem, delivers predictable protection, and keeps high‑current circuits safely guarded. A smart, practical upgrade for professionals who demand reliability, fast serviceability, and compatibility in one trusted package.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355322273954,"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_380865d1-5601-4d17-a908-dc6c0a4b705c.png?v=1764691303","url":"https:\/\/www.ampstate.com\/products\/square-d-lga36400u43x-400a-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}