{"product_id":"eaton-hld3400x-400a-600v-3-pole-bolt-on-circuit-breaker","title":"Eaton HLD3400X - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eEaton HLD3400X\u003c\/strong\u003e is a 400A, 600V, 3-pole bolt-on molded case circuit breaker designed to deliver reliable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Built for demanding environments, this unit maintains dependable protection across residential, commercial, and light industrial applications.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection for long-term reliability in panels subjected to movement or vibration.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e combines precise thermal delay with instantaneous magnetic actuation, delivering stable, repeatable protection across a range of load conditions and fault scenarios.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e designed to integrate seamlessly with matching Eaton OEM load centers and panelboards, ensuring predictable performance and straightforward replacement or upgrade paths.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole design\u003c\/strong\u003e delivers true three-phase protection for balanced loads and critical equipment in commercial and light industrial settings.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e ideal for upgrading or installing panelboards and load centers that require robust 400A, 600V protection in a compact bolt-on form factor.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eUse cases include panel modernization in multi-residential or commercial buildings, service panels for light industrial machinery, and new installations where secure bus connections and reliable trip performance are essential. If you’re upgrading an existing Eaton-compatible system or configuring a new three-phase distribution setup, the HLD3400X provides the dependable protection you need with a straightforward bolt-on installation.\u003c\/p\u003e \u003cp\u003eWhy this breaker matters: the bolt-on mounting reduces movement-related wear and arcing, while the thermal-magnetic trip unit ensures consistent protection without nuisance trips during variable loads. By matching OEM panelboards and load centers, it helps preserve system integrity and simplifies maintenance in the field.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eTechnical specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Eaton\u003c\/li\u003e \u003cli\u003ePart Number: HLD3400X\u003c\/li\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\u003eNumber of poles: 3\u003c\/li\u003e \u003cli\u003eMounting style: Bolt-on\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349606060194,"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_3afa964c-5485-4a9c-876d-6fddb11dbe52.png?v=1764151080","url":"https:\/\/www.ampstate.com\/products\/eaton-hld3400x-400a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}