{"product_id":"eaton-mdlb3400-circuit-breaker","title":"Eaton | MDLB3400 | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eEaton MDLB3400\u003c\/strong\u003e Circuit Breaker — 400A, 3-Pole, 600V — a rugged protective device designed for maintenance, retrofit, and replacement projects where exact specifications matter. This model is built to slot into existing Eaton systems where the MDLB3400 is the referenced part number, ensuring reliability and consistent protection across your electrical distribution.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAmperage: 400A\u003c\/li\u003e \u003cli\u003ePoles: 3-Pole\u003c\/li\u003e \u003cli\u003eVoltage: 600V\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIn three-phase installations, a 3-pole breaker like the MDLB3400 provides balanced protection across all conductors, helping prevent uneven fault currents and safeguarding motors, drives, and other three-phase equipment. With a 600V rating, it covers a broad range of commercial and industrial distribution needs while delivering dependable interruption performance when faults occur.\u003c\/p\u003e \u003ch3\u003eWhy choose this model\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eDirect compatibility for maintenance, retrofit, or replacement where the Eaton MDLB3400 is specified.\u003c\/li\u003e \u003cli\u003eHigh-current protection (400A) suitable for feeders and large circuits in industrial settings.\u003c\/li\u003e \u003cli\u003eThree-pole design ensures synchronized protection across all phases, enhancing system safety and reliability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and ordering guidance\u003c\/h3\u003e\n\u003cp\u003eNotes: Confirm fit and ratings before ordering. The part number is the best reference for compatibility, so verify that MDLB3400 matches your panel, bus configuration, and voltage class before purchase.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance and refurbishment of existing Eaton-based electrical distribution systems.\u003c\/li\u003e \u003cli\u003eRetrofits or upgrades where your installation requires a 400A, 3-pole, 600V protection device.\u003c\/li\u003e \u003cli\u003eReplacement of worn or failed protection devices in industrial panels, commercial distribution equipment, or service entrances that rely on Eaton components.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical considerations and tips\u003c\/h3\u003e\n\u003cp\u003eTo ensure a smooth installation, align the breaker’s ratings with your equipment’s design specifications and refer to the system labeling for permitted amperage, voltage, and pole configuration. Keep the MDLB3400 as part of your standard replacement parts inventory to minimize downtime and maintain consistent protection across your facility.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Eaton","offers":[{"title":"Default Title","offer_id":46427390345378,"sku":"MDLB3400","price":12248.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/eaton-mdlb3400-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}