{"product_id":"square-d-ma264001121-circuit-breaker","title":"Square D | MA264001121 | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D MA264001121 Circuit Breaker is a high-capacity protection device designed for demanding 3‑phase electrical systems. With a 400 A rating across 3 poles and a 600 V operating capability, this unit is built to safeguard large commercial and industrial circuits from overloads and short circuits while keeping power flowing safely to critical equipment.\u003c\/p\u003e \u003cp\u003eThis breaker is specifically suitable for maintenance, retrofit, and replacement projects where exact specifications matter. When your panel or distribution setup requires an MA264001121‑type device, this unit delivers a reliable, compatible solution that fits the intended electrical architecture.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Confirm fit and ratings before ordering. The part number MA264001121 is the best reference for compatibility.\u003c\/p\u003e \u003ch3\u003eKey specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole (three-phase protection)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e MA264001121\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this unit stands out\u003c\/h3\u003e\n\u003cp\u003eChoosing the MA264001121 means aligning with a proven Square D design that supports robust protection for three-phase feeders. Its 400 A capacity is well-suited for main or large branch circuits, helping to prevent outages in material handling lines, processing equipment, or critical manufacturing controls. The 3-pole configuration ensures simultaneous shutdown of all phases, reducing risk during fault conditions and simplifying safe maintenance.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance: replacing aging or failed breakers in existing Square D installations where 3‑pole, 600 V protection is required.\u003c\/li\u003e \u003cli\u003eRetrofit: upgrading panel protection to accommodate higher current demands in commercial or light industrial environments.\u003c\/li\u003e \u003cli\u003eReplacement: exact-match replacement for systems specifying MA264001121 to maintain electrical system continuity and compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical guidance for installation and compatibility\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAlways verify the panel labeling and service ratings to ensure 400 A, 3‑pole, and 600 V compatibility.\u003c\/li\u003e \u003cli\u003eUse the part number MA264001121 as the definitive reference when sourcing spares or performing replacements.\u003c\/li\u003e \u003cli\u003eFor safe handling, shut off power, use appropriate personal protective equipment, and follow electrical code requirements during installation or replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46426398589090,"sku":"MA264001121","price":2010.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-ma264001121-circuit-breaker-400a-3-pole-600v-848.webp?v=1789569659","url":"https:\/\/www.ampstate.com\/products\/square-d-ma264001121-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}