{"product_id":"square-d-mxf36400-circuit-breaker","title":"Square D | MXF36400 | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D MXF36400 circuit breaker—a rugged, high-capacity protective device engineered for reliability in demanding electrical environments. This 400A, 3-pole unit delivers secure protection for three-phase circuits and is tailored for maintenance, retrofit, and replacement projects where exact specifications matter.\u003c\/p\u003e \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:\u003c\/strong\u003e 600V\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy choose MXF36400 for your next project\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eExact fit for replacement and retrofit\u003c\/strong\u003e: Designed to match the MXF36400 specification, making it the best reference for compatibility when upgrading or restoring protection in existing Square D panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-phase protection\u003c\/strong\u003e with a 3-pole design, ideal for modern commercial and industrial systems that run on three-phase power.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current capability\u003c\/strong\u003e—400A protection helps safeguard feeders and main conductors against overloads while keeping system downtime to a minimum.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBroad voltage range\u003c\/strong\u003e suitable for 600V applications, aligning with many industrial electrical distributions and panel configurations.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIdeal use cases and scenarios\u003c\/p\u003e \u003cul\u003e \u003cli\u003eMaintenance: replace aging or failing breakers in established Square D panels to restore reliable protection without changing surrounding circuitry.\u003c\/li\u003e \u003cli\u003e Retrofit: upgrade legacy installations to a robust 400A, 3-pole 600V solution when load demands increase or when panel specifications require exact MXF36400 compatibility.\u003c\/li\u003e \u003cli\u003eReplacement: have a genuine MXF36400 on hand for quick, precise substitution during routine service or emergency repair, reducing installation guesswork.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003ePractical considerations to ensure a smooth fit\u003c\/p\u003e \u003cul\u003e \u003cli\u003eAlways verify fit and ratings before ordering, using the MXF36400 part number as the compatibility reference.\u003c\/li\u003e \u003cli\u003eCheck panel labeling to confirm that a 3-pole, 600V, 400A device is supported by your enclosure and bus assembly.\u003c\/li\u003e \u003cli\u003eHandle and install according to standard electrical practices and manufacturer guidelines to maintain safety and compliance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eDesigned for reliability, backed by the Square D heritage, and targeted to professionals who need a precise, dependable 400A, 3-pole, 600V circuit breaker. When compatibility and performance are non-negotiable, MXF36400 stands out as the clear choice for maintenance, retrofit, and replacement projects.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46426230522018,"sku":"MXF36400","price":2010.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a085eff1-75dd-47ee-b131-4c8df8f0489b.png?v=1765492976","url":"https:\/\/www.ampstate.com\/products\/square-d-mxf36400-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}