{"product_id":"eaton-kd3400s09-400a-3p-circuit-breaker","title":"Eaton KD3400S09 Circuit Breaker, 400A, 3-Pole","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Eaton KD3400S09, a rugged 400 A, 3-pole circuit breaker designed for demanding industrial electrical service, maintenance, and replacement projects. Built to protect your distribution network from overloads and short circuits, this Eaton device delivers dependable protection and straightforward integration in both new installations and upgrades.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole protection for three-phase systems:\u003c\/strong\u003e Balanced fault protection across all phases in manufacturing lines, warehouses, and facility service panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current capability:\u003c\/strong\u003e 400 A rating provides robust protection for heavy-load feeders and main service conduits, reducing the risk of equipment damage.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart-number driven compatibility:\u003c\/strong\u003e Use KD3400S09 to confirm the exact fit for your panel, busbar arrangement, and upstream devices. Always verify fit by part number and application requirements.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIndustrial-grade reliability:\u003c\/strong\u003e Engineered by Eaton to withstand the demands of continuous operation in industrial environments, with dependable trip performance when faults occur.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReplacement and upgrade-ready:\u003c\/strong\u003e Ideal for replacing aging breakers or upgrading service capacity in mid- to large-scale electrical infrastructure.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupport when you need it:\u003c\/strong\u003e If you're unsure about compatibility, our team is ready to help verify fit and recommend the best installation approach.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eSpecifications at a glance:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eManufacturer: Eaton\u003c\/li\u003e \u003cli\u003ePart Number: KD3400S09\u003c\/li\u003e \u003cli\u003eProduct Type: Circuit Breaker\u003c\/li\u003e \u003cli\u003eAmperage: 400 A\u003c\/li\u003e \u003cli\u003ePoles: 3\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003ePractical tips for selecting and using this breaker:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eAlways confirm the exact part number against your panel or distribution equipment before purchase to ensure proper fit and performance.\u003c\/li\u003e \u003cli\u003eCoordinate with your facility's protection scheme—three-phase systems typically require balanced protection across all legs, which a 3-pole breaker provides.\u003c\/li\u003e \u003cli\u003eConsult a licensed electrician for installation to meet electrical codes and safety standards.\u003c\/li\u003e \u003cli\u003eFor replacements, compare the KD3400S09 against the existing breaker’s frame size and mounting configuration to ensure seamless compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46416041312418,"sku":"KD3400S09","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_229276d9-908d-46df-93e5-6fe31866e0ff.png?v=1765492975","url":"https:\/\/www.ampstate.com\/products\/eaton-kd3400s09-400a-3p-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}