{"product_id":"square-d-q422400ac-circuit-breaker","title":"Square D | Q422400AC | Circuit Breaker | 400A | 2-Pole | 25kA","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D Q422400AC circuit breaker—a purpose-built solution for demanding electrical systems where precise protection matters. This 400A, 2-pole unit brings dependable interruption capability (25kA) to maintenance, retrofit, and replacement projects, ensuring quick isolation of faults and minimal downtime.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAmperage: 400A\u003c\/li\u003e \u003cli\u003ePoles: 2-Pole\u003c\/li\u003e \u003cli\u003eInterrupt rating: 25kA\u003c\/li\u003e \u003cli\u003ePart number: Q422400AC\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this breaker matters\u003c\/h3\u003e\n\u003cp\u003eIn systems where high fault currents are a reality, the Q422400AC delivers robust protection by interrupting dangerous conditions swiftly. Its two-pole design provides coordinated protection for both legs of a circuit, helping safeguard equipment, reduce arc-flash risk, and support safer maintenance procedures in service entrances, feeders, and panel boards.\u003c\/p\u003e \u003ch3\u003eWho it's ideal for\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eFacility managers overseeing retrofit and upgrade projects in commercial or light industrial settings\u003c\/li\u003e \u003cli\u003eElectrical contractors replacing aging or non-matching breakers in existing Square D installations\u003c\/li\u003e \u003cli\u003eMaintenance teams seeking a reliable, high-capacity solution for critical power distribution\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eUse cases and scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacement of a failed or incompatible breaker in a 400A service panel\u003c\/li\u003e \u003cli\u003eRetrofits where new equipment requires matching 2-pole 400A protection with a 25kA interrupt rating\u003c\/li\u003e \u003cli\u003eDirect substitution in systems designed around Square D Q-series protection devices\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eFit, compatibility, and buying confidently\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, confirm the fit and ratings match your panel or distribution equipment. The part number Q422400AC is the most reliable reference for compatibility within Square D installations. If your panel model accepts a 400A, 2-pole breaker with a 25kA interrupt rating, this unit is a strong match.\u003c\/p\u003e \u003ch3\u003eInstallation and safety notes\u003c\/h3\u003e\n\u003cp\u003eFollow standard electrical safety practices and local codes when replacing or installing this breaker. Ensure the power is fully shut off and that proper lockout\/tagout procedures are in place. For optimal performance, verify that the panel labeling and field wiring align with the breaker’s specifications and torque requirements.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46425678086306,"sku":"Q422400AC","price":310.0,"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-q422400ac-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}