{"product_id":"eaton-kdb3400-400a-600v-3-pole-circuit-breaker","title":"Eaton KDB3400 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Eaton KDB3400 is a 3-pole molded-case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection for panelboards and load centers. With a robust 400A rating and a 600V maximum, this breaker is built to keep commercial, residential, and light industrial electrical systems safe and running smoothly.\u003c\/p\u003e \u003ch2\u003e why choose the Eaton KDB3400\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSpace-efficient molded-case design\u003c\/strong\u003e minimizes panel footprint, making it easier to fit large protection capabilities into compact panelboards and load centers.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal‑magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection: the thermal element handles nuisance overloads, while the magnetic element delivers fast disconnection during short‑circuit events.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole configuration\u003c\/strong\u003e ensures balanced protection across all phases, reducing the risk of unbalanced loads and unnecessary trips.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600V rating\u003c\/strong\u003e supports higher‑voltage electrical systems common in commercial and light industrial environments, with proven performance in demanding applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e400A protection\u003c\/strong\u003e is ideal for main feeders or large branch circuits in panelboards, delivering solid protection where it matters most.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e is designed to align with matching Eaton load centers and panelboards, offering straightforward installation and streamlined stocking.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eSpecifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage rating: 400 A\u003c\/li\u003e \u003cli\u003eVoltage rating: 600 V\u003c\/li\u003e \u003cli\u003ePoles: 3\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e \u003cli\u003ePart number: KDB3400\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal uses and scenarios\u003c\/h3\u003e\n\u003cp\u003eWhether you’re upgrading a commercial panel, outfitting a light industrial service entrance, or expanding a residential system with higher protection needs, the KDB3400 shines when you require dependable discipline for large feeders and critical circuits. Its compact form helps you maximize space inside panelboards, while its reliable protection keeps equipment safe and uptime high in environments that demand consistent performance.\u003c\/p\u003e \u003ch3\u003ePractical integration tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePair the KDB3400 with compatible Eaton OEM load centers and panelboards to maintain optimal coordination with adjacent protective devices.\u003c\/li\u003e \u003cli\u003eOperate within the 600V system specification to ensure safe, reliable performance across commercial and industrial installations.\u003c\/li\u003e \u003cli\u003eConsult Eaton installation guidelines during commissioning to confirm correct mounting, alignment, and any system-wide coordination requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349628637346,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/eaton_breaker_and_panels_444cb9f3-53e3-4dad-aff9-55387b6bee76.png?v=1764151888","url":"https:\/\/www.ampstate.com\/products\/eaton-kdb3400-400a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}