{"product_id":"eaton-kd3400k-400a-600v-3-pole-circuit-breaker","title":"Eaton KD3400K - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Eaton KD3400K is a 400A, 600V, 3-pole molded case circuit breaker designed for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built to integrate seamlessly with matching OEM panel systems, this MCCB delivers precise protection where space, reliability, and fast response matter most.\u003c\/p\u003e \u003ch3\u003eWhy the KD3400K stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded case design\u003c\/strong\u003e maximizes panel space and simplifies installation, letting you fit robust protection into tighter electrical environments without compromising performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection characteristics. The thermal element handles overloads smoothly, while the magnetic element delivers rapid, dependable response to short circuits—reducing the risk of damage to wiring and equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible compatibility\u003c\/strong\u003e is engineered to work with the corresponding manufacturer’s load centers and panelboards, ensuring a clean fit, predictable performance, and easier maintenance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application range\u003c\/strong\u003e suitable for residential, commercial, and light industrial settings, giving you a single, reliable solution across multiple projects.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer\u003c\/strong\u003e: Eaton\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: KD3400K\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Thermal-magnetic molded case circuit breaker (MCCB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage Rating\u003c\/strong\u003e: 400A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating\u003c\/strong\u003e: 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles\u003c\/strong\u003e: 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eService and distribution panels in commercial facilities where space is at a premium but protection must not be compromised.\u003c\/li\u003e \u003cli\u003eUpgrading or replacing aging breakers in light industrial panel centers to improve protection accuracy and trip performance.\u003c\/li\u003e \u003cli\u003eNew installations in residential or multi-residential buildings requiring a robust 3-pole solution for feeder circuits and essential equipment.\u003c\/li\u003e \u003cli\u003eSystems that demand consistency across multiple panels, thanks to OEM-aligned compatibility that helps maintain uniform protection characteristics.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat problems does it solve?\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePrevents damage from overcurrent and short circuits by providing fast, predictable tripping behavior.\u003c\/li\u003e \u003cli\u003eMaximizes usable panel space without sacrificing protective capabilities—beneficial when panel configuration is tight or has limited clearance.\u003c\/li\u003e \u003cli\u003eReduces maintenance headaches with a reliable thermal-magnetic trip that remains consistent across electrical loads and environmental conditions.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eInstallation and compatibility tips\u003c\/h3\u003e\n\u003cp\u003eEnsure your panel or load center is designed to accommodate a 3-pole, 400A MCCB with a 600V rating. The KD3400K is engineered for seamless integration with matching Eaton OEM panels, delivering consistent electrical performance and straightforward field replacement when needed. Always follow electrical codes and manufacturer guidelines for torque, termination sizes, and enclosure suitability.\u003c\/p\u003e \u003ch3\u003eWhy choose Eaton for circuit protection\u003c\/h3\u003e\n\u003cp\u003eEaton has a long-standing reputation for durable, dependable protection solutions. The KD3400K combines a compact form factor with precise thermal-magnetic protection, reducing the risk of nuisance trips while maintaining strong protection for conductors and connected equipment. In environments ranging from home systems to light industrial facilities, this 3-pole MCCB offers a practical, future-ready choice that aligns with your existing panel ecosystem.\u003c\/p\u003e \u003ch3\u003eIn summary\u003c\/h3\u003e\n\u003cp\u003eThe Eaton KD3400K is a purpose-built 400A, 600V, 3-pole molded case circuit breaker that delivers reliable branch circuit and short-circuit protection in panelboards and load centers. With its space-saving design, stable thermal-magnetic trip unit, and OEM-compatible compatibility, it’s a smart, durable choice for residential, commercial, and light industrial applications. When you need dependable protection that fits your panel system and performs consistently under demanding conditions, the KD3400K stands ready to deliver.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349627850914,"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_d2c5683a-e94c-4447-ab15-1e6b398c59ea.png?v=1764151849","url":"https:\/\/www.ampstate.com\/products\/eaton-kd3400k-400a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}