{"product_id":"square-d-lra36400u33x-circuit-breaker","title":"Square D | LRA36400U33X | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eSquare D's LRA36400U33X is a rugged 400A, 3-pole circuit breaker engineered for reliable protection of 600V three-phase electrical systems. Designed for maintenance, retrofit, and replacement projects, this unit delivers dependable performance where exact specifications matter most, helping you keep critical equipment running safely and efficiently.\u003c\/p\u003e \u003ch2\u003eKey specifications at a glance\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReference \/ part number:\u003c\/strong\u003e LRA36400U33X\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility note:\u003c\/strong\u003e Confirm fit and ratings before ordering — the part number is the best reference for compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this unit stands out\u003c\/h2\u003e\n\u003cp\u003eUnlike generic breakers, the LRA36400U33X is purpose-built for Square D installations, offering precise form, fit, and function for three-phase 600V distributions. It supports steady protection in demanding environments and integrates smoothly with existing Square D panels and bus configurations, reducing misfit risk during retrofits and replacements. This is a practical choice when you need a trusted, official reference that aligns with your current electrical infrastructure.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eRetrofit projects where existing panels require a 400A, 3-pole, 600V protection device with a proven compatibility track record.\u003c\/li\u003e \u003cli\u003eMaintenance replacements to restore original protection characteristics without panel modifications.\u003c\/li\u003e \u003cli\u003eNew installations in commercial or industrial settings that operate high-current, three-phase 600V circuits.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eInstallation \u0026amp; compatibility tips\u003c\/h2\u003e\n\u003cp\u003eTo ensure reliable performance, verify that the panel’s catalog and bus arrangement match the LRA36400U33X specifications. Since the part number is the best reference for compatibility, cross-check it against your panel's documentation before procurement. If you're upgrading from an older unit, plan for a straightforward swap by aligning mounting, wiring terminals, and trip characteristics with your existing setup.\u003c\/p\u003e \u003ch2\u003eCare and handling\u003c\/h2\u003e\n\u003cp\u003eHandle with clean, dry hands and store in a dry area prior to installation. De-energize the circuit and follow standard electrical safety practices during replacement or retrofit work. After installation, perform a controlled test to confirm proper operation within your system’s protection scheme.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46426708344994,"sku":"LRA36400U33X","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-lra36400u33x-circuit-breaker-400a-3-pole-600v-299.webp?v=1789607373","url":"https:\/\/www.ampstate.com\/products\/square-d-lra36400u33x-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}