{"product_id":"eaton-fdb4040-circuit-breaker","title":"Eaton | FDB4040 | Circuit Breaker | 40A | 4-Pole","description":"\u003cdiv\u003e\n\u003cp\u003eThe Eaton FDB4040 Circuit Breaker is a precise, ready-to-use protection solution designed for maintenance, retrofit, and replacement projects where exact specifications matter. With a 40A rating and a four-pole configuration, this unit protects multi‑phase electrical systems while simplifying modernization or repairs in commercial and light industrial environments.\u003c\/p\u003e \u003ch2\u003eKey features and benefits\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage and configuration:\u003c\/strong\u003e 40 A, 4‑pole design to safeguard three‑phase circuits with neutral return paths, providing comprehensive protection across all conductors.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eExact part reference:\u003c\/strong\u003e Model number FDB4040 serves as the clearest compatibility reference, helping you verify fit during replacements or retrofits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaintenance and retrofit ready:\u003c\/strong\u003e Specifically suitable for upgrades, replacements, and service work where matching specifications are required to maintain system integrity.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility guidance:\u003c\/strong\u003e For the best results, confirm fit and ratings before ordering; use the part number as the primary compatibility check.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy choose the Eaton FDB4040?\u003c\/h2\u003e\n\u003cp\u003eChoosing the FDB4040 means selecting a circuit protection device with a proven track record in Eaton-compatible installations. The four-pole design aligns with 3‑phase systems that include a neutral, ensuring all conductors are simultaneously protected and trip coordination remains intact during faults. This is especially important for service panels, upgrade projects, and ongoing maintenance where downtime is minimized and reliability is essential.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eMaintenance shut-downs or component replacements in commercial electrical rooms and light-industrial facilities\u003c\/li\u003e \u003cli\u003eRetrofit projects where existing panel boards require matching 4‑pole, 40A protection to maintain electrical code compliance\u003c\/li\u003e \u003cli\u003ePanel upgrades to support new or expanded 3‑phase loads without changing the protective strategy\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eHow to verify compatibility\u003c\/h2\u003e\n\u003cp\u003eBefore placing an order, confirm that the panel or enclosure accepts a 4‑pole, 40A Eaton breaker and that the FDB4040 is the correct form factor for your installation. The part number is the most reliable reference for compatibility, so cross-check it against your panel label or documentation. If you’re replacing a unit, matching the exact part number minimizes risk and ensures proper fit and trip characteristics.\u003c\/p\u003e \u003ch2\u003ePractical considerations and tips\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eKeep a copy of the panel’s installation guide on file and reference the part number FDB4040 when sourcing replacements.\u003c\/li\u003e \u003cli\u003eFollow standard electrical safety practices: de-energize equipment and use proper personal protective equipment during inspection or replacement.\u003c\/li\u003e \u003cli\u003eDocument the change in your maintenance records, noting the amperage, pole count, and part number to simplify future servicing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Eaton","offers":[{"title":"Default Title","offer_id":46427389984930,"sku":"FDB4040","price":2432.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/eaton-fdb4040-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}