{"product_id":"eaton-ld3400-400a-600v-3-pole-circuit-breaker","title":"Eaton LD3400 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Eaton LD3400 — a 400A, 600V, 3-pole molded‑case circuit breaker designed for dependable branch‑circuit overcurrent and short‑circuit protection. Brought to you by AmpState, this unit pairs Eaton’s trusted engineering with a compact form factor that fits cleanly into panelboards and load centers, making it a reliable backbone for both new installs and panel upgrades.\u003c\/p\u003e \u003ch3\u003eWhy the LD3400 stands out in real-world use\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSpace‑efficient molded‑case design\u003c\/strong\u003e minimizes panel footprint, helping you maximize enclosure capacity without compromising protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal‑magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection: the thermal element responds to gradual overcurrent, while the magnetic element provides an instantaneous trip for high‑energy faults, reducing the risk of damage to downstream equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3‑pole configuration with common trip\u003c\/strong\u003e ensures synchronized disconnection across all poles in three‑phase circuits, enhancing safety and system reliability.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e400A rating at 600V\u003c\/strong\u003e supports substantial branch circuits found in commercial and light industrial environments, while still suitable for demanding residential applications where large loads are present.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM‑grade compatibility\u003c\/strong\u003e is designed to fit with matching Eaton OEM load centers and panelboards, delivering a seamless, reliable replacement or upgrade path.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical snapshot\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePart Number: LD3400\u003c\/li\u003e \u003cli\u003eType: Thermal‑magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: 400A\u003c\/li\u003e \u003cli\u003eVoltage Rating: 600V\u003c\/li\u003e \u003cli\u003eNumber of Poles: 3\u003c\/li\u003e \u003cli\u003eApplications: Branch circuit overcurrent and short‑circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal for your projects\u003c\/h3\u003e\n\u003cp\u003ePerfect for residential installations requiring robust service reliability, commercial panelboards that demand strong fault protection, and light industrial applications where large loads are common. The LD3400’s compact design and reliable trip performance make it a practical choice for service panels, main distribution panels, and retrofit upgrades where space, safety, and long‑term durability matter.\u003c\/p\u003e \u003ch3\u003ePractical considerations and tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eVerify that the enclosure and bus arrangement match the LD3400’s rating and OEM specifications to ensure a proper fit.\u003c\/li\u003e \u003cli\u003ePlan for coordinated protection by using the 3‑pole design where three‑phase circuits are present, ensuring all poles trip together during a fault.\u003c\/li\u003e \u003cli\u003eKeep maintenance simple by choosing compatible Eaton load centers and panelboards to preserve system integrity and OEM performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349631979682,"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_5b36d536-159d-4cca-81c3-9e6cf0a710ea.png?v=1764151981","url":"https:\/\/www.ampstate.com\/products\/eaton-ld3400-400a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}