{"product_id":"eaton-hkd3400-400a-600v-3-pole-circuit-breaker","title":"Eaton hkd3400 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Eaton HKD3400 is a rugged 400 A, 600 V, 3-pole molded-case circuit breaker designed to protect branch circuits and withstand the demands of panelboards and loadcenters. Built for dependable overcurrent and short-circuit protection, this unit is a smart upgrade or replacement choice for evolving electrical systems in residential, commercial, and light industrial settings.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded-case design\u003c\/strong\u003e maximizes panel space, helping you fit more circuits in the same enclosure without sacrificing protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection performance across varying loads and fault conditions, providing precise coordination with other devices in the same panel.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole configuration\u003c\/strong\u003e ensures balanced protection for 3-phase systems and reduces wiring complexity, ideal for motor loads and commercial applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-loadcenter compatibility\u003c\/strong\u003e engineered to pair with matching Eaton loadcenters and panelboards for straightforward installation and reliable operation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial environments where robust 400 A protection is required.\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 HKD3400\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 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\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 \u003cp\u003eWhy this breaker matters in real-world installations: for panel upgrades or new builds in spaces with significant electrical demand, the HKD3400 provides reliable protection for feeders and branch circuits. Its thermal-magnetic trip responds quickly to short circuits while maintaining stable operation during normal load fluctuations, reducing nuisance trips and helping protect downstream equipment such as pumps, conveyors, and lighting systems.\u003c\/p\u003e \u003ch3\u003eIdeal use scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eUpgrading a residential or small commercial service panel where 3-phase loads or large motor circuits require solid protection.\u003c\/li\u003e \u003cli\u003eReplacing aging breakers in Eaton-compatible panelboards to restore protection continuity and panel reliability.\u003c\/li\u003e \u003cli\u003eFeeding critical equipment in light industrial environments where space efficiency and robust fault protection matter.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eFor buyers at AmpState, the HKD3400 represents a dependable, OEM-aligned choice that aligns with established Eaton panel systems. When selecting this breaker, consider the specific load requirements, ensure compatibility with your panelboard model, and follow proper installation practices to maintain safe, code-compliant operation. Keep a spare HKD3400 on hand for maintenance planning, and verify correct torque on terminations to preserve connection integrity over time.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349672251554,"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_6bc7bba7-e6de-4160-8e39-1c8eb8dff1c2.png?v=1764153451","url":"https:\/\/www.ampstate.com\/products\/eaton-hkd3400-400a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}