{"product_id":"square-d-lla36400u43x-circuit-breaker","title":"Square D | LLA36400U43X | Circuit Breaker | 400A | 3-Pole","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing the Square D LLA36400U43X circuit breaker—a rugged 400A, 3-Pole protection device designed to deliver reliable performance in demanding electrical environments. Identified by part number LLA36400U43X, this unit is a precise match for maintenance, retrofit, and replacement projects where exact specifications matter.\u003c\/p\u003e \u003ch2\u003eKey specifications and compatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400A\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/p\u003e\n\u003cp\u003eImportant: \u003cstrong\u003econfirm fit and ratings before ordering\u003c\/strong\u003e. The \u003cstrong\u003epart number LLA36400U43X\u003c\/strong\u003e serves as the best reference to ensure compatibility with your Square D panel and its trip characteristics.\u003c\/p\u003e \u003ch2\u003eWhy this 3-Pole breaker matters\u003c\/h2\u003e\n\u003cp\u003eThree-pole protection is essential for maintaining balanced three-phase systems. This breaker delivers synchronized protection across all phases, helping prevent overloads, arcing, and faults in commercial or industrial equipment.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eMaintenance: service existing Square D installations while preserving accurate protection specs.\u003c\/li\u003e \u003cli\u003eRetrofit: upgrade or replace aging protection with a direct-match part to maintain system integrity.\u003c\/li\u003e \u003cli\u003eReplacement: quickly swap a failed unit with a part-number-specific breaker to minimize downtime.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePractical guidance for selecting and installing\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eUse the part number LLA36400U43X as the primary reference when verifying compatibility with your panel model and rating.\u003c\/li\u003e \u003cli\u003eCheck the panel labeling to ensure the amperage and 3-Pole configuration are permitted for your specific installation.\u003c\/li\u003e \u003cli\u003eMatch the replacement’s trip characteristics and mounting style to your existing Square D setup to maintain consistent protection behavior.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy choose Square D for your system\u003c\/h2\u003e\n\u003cp\u003eSquare D is trusted for durable, field-proven circuit protection. The LLA36400U43X 400A, 3-Pole breaker is designed to integrate with compatible Square D panels, delivering dependable performance under demanding loads and environments.\u003c\/p\u003e \u003cp\u003eReady to secure exact-fit protection? Add the LLA36400U43X to your cart and proceed with confidence, knowing you have a precise, compatible part for maintenance, retrofit, or replacement needs.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46426840662178,"sku":"LLA36400U43X","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_63e470e9-d360-4ffe-a511-3550084c618c.png?v=1766907689","url":"https:\/\/www.ampstate.com\/products\/square-d-lla36400u43x-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}