{"product_id":"eaton-mdl3400-400a-600v-3-pole-circuit-breaker","title":"Eaton MDL3400 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Eaton MDL3400 is a purpose-built 3-pole molded case circuit breaker rated at 400 A and 600 V, engineered for dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. This compact unit delivers precise protection where space and reliability matter most, making it a smart choice for modern electrical systems.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWhy the MDL3400 stands out\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded case design\u003c\/strong\u003e optimizes panel space without compromising amperage or protection, helping you nail clean, efficient installations in tight panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection across varying loads and temperatures, reducing nuisance trips while maintaining rapid response to overcurrents and short circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e built to pair with matching Eaton OEM loadcenters and panelboards, enabling quick, straightforward replacements or upgrades with consistent fit and performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e suited for residential, commercial, and light industrial environments where reliable 400 A protection is required across three phases.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole synchronization\u003c\/strong\u003e ensures coordinated disconnection across all phases for balanced protection and safer fault clearance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical snapshot\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eAmperage rating: \u003cstrong\u003e400 A\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eVoltage rating: \u003cstrong\u003e600 V\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eNumber of poles: \u003cstrong\u003e3\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eType: \u003cstrong\u003eThermal-magnetic molded case circuit breaker\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003ePart number: \u003cstrong\u003eMDL3400\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eApplication: \u003cstrong\u003eBranch circuit overcurrent and short-circuit protection\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eIdeal use cases\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eUpgrading panelboards in commercial spaces that require robust 400 A branch protection with a reliable trip mechanism\u003c\/li\u003e \u003cli\u003eFeeding subpanels in light industrial facilities where three-phase protection and quick, predictable disconnection are critical\u003c\/li\u003e \u003cli\u003eResidential-commercial mix installations that demand durable protection for large, multi-wire branch circuits\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhat this means in practice\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe MDL3400 doesn't just meet the basics of overcurrent protection—it delivers consistent performance in real-world conditions. The thermal-magnetic technology adapts to load fluctuations, while the compact form factor simplifies panel layouts and reduces installation time. If you’re stocking a panel upgrade or refurbishing a panelboard, this breaker aligns with Eaton’s OEM ecosystem, helping you maintain compatibility and streamline maintenance.\u003c\/p\u003e \u003cp\u003eChoose the Eaton MDL3400 for a dependable, three-pole solution that balances space efficiency, protection reliability, and ease of integration in residential, commercial, and light industrial electrical systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349638008994,"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_e15398c4-8166-47a7-8ff6-160ad68f7144.png?v=1764152186","url":"https:\/\/www.ampstate.com\/products\/eaton-mdl3400-400a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}