{"product_id":"eaton-dk3400-400a-240v-3-pole-circuit-breaker","title":"Eaton DK3400 - 400 A, 240 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eEaton DK3400\u003c\/strong\u003e — a rugged 400 A, 240 V, 3-pole molded case circuit breaker designed for dependable protection in panelboards and loadcenters. This device is built to guard you against overcurrent and short-circuit conditions across residential, commercial, and light industrial applications, delivering peace of mind where it matters most.\u003c\/p\u003e \u003cp\u003eEngineered for practical, real-world use, the DK3400 combines a compact molded case design with a reliable thermal-magnetic trip unit. This pairing provides stable, repeatable protection performance, reacting intelligently to both prolonged overloads and instantaneous fault currents. The result is consistent protection that you can depend on, even in busy electrical environments.\u003c\/p\u003e \u003cp\u003eKey advantages that set this breaker apart\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSpace-efficient molded case design\u003c\/strong\u003e: Optimizes panel layout, freeing up valuable space in switchgear and reducing installation complexity.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e: Offers reliable, predictable protection by addressing both overload and short-circuit conditions without nuisance tripping.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-panel compatibility\u003c\/strong\u003e: Designed to pair with matching Eaton OEM loadcenters and panelboards for streamlined replacement and upgrade projects.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile across environments\u003c\/strong\u003e: Suitable for residential, commercial, and light industrial electrical setups where dependable branch circuit protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical snapshot\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: DK3400\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage rating\u003c\/strong\u003e: 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating\u003c\/strong\u003e: 240 V\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\u003eIdeal use cases and practical benefits\u003c\/h3\u003e\n\u003cp\u003eThe DK3400 is an excellent choice when you need robust protection for feeder circuits feeding multiple branch circuits inside a panelboard, or as part of a modernization project where you want to maintain a cohesive OEM protection family. It’s particularly well-suited for installations that require:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eMain or feeder protection in service panels and distribution panels within light commercial spaces\u003c\/li\u003e \u003cli\u003eUpgrades or replacements in existing Eaton-powered installations to maintain full system coordination\u003c\/li\u003e \u003cli\u003eReliable protection for motor-driven loads where inrush and fault currents must be managed safely\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eHow this compares to alternatives (without naming competitors)\u003c\/h3\u003e\n\u003cp\u003eWith its molded case construction and a thermal-magnetic trip mechanism, the DK3400 offers a compact, plug-compatible solution that emphasizes panel space efficiency and predictable protection. When you’re updating or expanding an Eaton-based electrical system, choosing the DK3400 helps preserve system coordination, simplifies ordering with a like-for-like part, and minimizes modification requirements in the panel enclosure. The result is a cleaner, faster installation with protection you can trust across a range of light industrial and commercial environments.\u003c\/p\u003e \u003ch3\u003eTips for installation and optimal performance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eVerify compatibility with the existing OEM loadcenter or panelboard family before replacement to ensure seamless operation and coordination.\u003c\/li\u003e \u003cli\u003eInstall using proper torque on mounting and lugs as specified for molded case breakers to maintain reliable electrical contact.\u003c\/li\u003e \u003cli\u003eCoordinate protection levels within the panel by pairing the DK3400 with other Eaton protection devices designed for the same system to optimize overall reliability.\u003c\/li\u003e \u003cli\u003eWhen planning a retrofit or expansion, consider the DK3400’s space-saving footprint to maximize panel efficiency and reduce wiring congestion.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eChoose the \u003cstrong\u003eEaton DK3400\u003c\/strong\u003e when you need a dependable, space-conscious solution for 400 A, 240 V, 3-pole protection that integrates smoothly with Eaton panelboards and loadcenters, delivering consistent performance for years of service.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349529317538,"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_022d8d75-ea8f-4d91-b5e2-b441e73cb785.png?v=1764148899","url":"https:\/\/www.ampstate.com\/products\/eaton-dk3400-400a-240v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}