{"product_id":"ljf46400cu31x","title":"Square D LJF46400CU31X - 400A, 600VAC, 4-Pole, Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003eEngineered for demanding electrical systems, the Square D LJF46400CU31X delivers robust overcurrent protection in a compact, high-capacity package. With a 400A rating and a 600VAC maximum, this 4-pole circuit breaker is built to handle heavy loads in modern industrial environments, ensuring reliable performance in panelboards, switchboards, and control panels.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCurrent rating:\u003c\/strong\u003e 400A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e up to 600VAC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 4-Pole configuration for complete conductor disconnection in three-phase systems\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBreaker type:\u003c\/strong\u003e Circuit Breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplications:\u003c\/strong\u003e Ideal for industrial, commercial, and OEM setups where dependable protection in distribution panels and motor control centers is essential\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this design stands out\u003c\/h3\u003e\n\u003cp\u003eThe 4-pole configuration of the LJF46400CU31X provides enhanced safety and flexibility, enabling simultaneous disconnection of all hot conductors in three-phase systems. This makes maintenance safer and minimizes arc exposure. Built for durability, it stands up to the rigors of continuous operation in demanding environments, delivering consistent protection where power reliability matters most.\u003c\/p\u003e \u003ch3\u003eReal-world use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\u003cstrongdistribution panels:\u003e Protect and control large electrical feeders serving multiple downstream circuits.\u003c\/strongdistribution\u003e\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMotor control centers (MCCs):\u003c\/strong\u003e Safely interrupt all phases to protect motors and associated equipment during startup or fault conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSwitchboards and control panels:\u003c\/strong\u003e Centralized protection for complex power distribution in manufacturing, facilities, and processing plants.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM assemblies:\u003c\/strong\u003e Integration into custom electrical assemblies that demand high-current protection with reliable trip performance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho benefits most\u003c\/h3\u003e\n\u003cp\u003eFacilities and systems with high current demands in industrial or commercial settings will appreciate the LJF46400CU31X for its authoritative 400A protection at up to 600VAC. It’s especially well-suited for environments where panel reliability, quick fault isolation, and safe maintenance are priorities, including OEM-build projects, large-machine installations, and centralized power distribution up front in a plant.\u003c\/p\u003e \u003ch3\u003ePractical considerations and best practices\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEnsure the enclosure and wiring practices accommodate a 400A, 600VAC device and follow applicable electrical codes for safe installation.\u003c\/li\u003e \u003cli\u003ePlan for coordinated protection with upstream devices to optimize system reliability and minimize nuisance trips.\u003c\/li\u003e \u003cli\u003eLabel and document the 4-pole configuration clearly in panel schedules to reflect the full isolation capability during maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default","offer_id":46390615441570,"sku":"LJF46400CU31X","price":593.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/circuit_breaker_generic_8032d0ba-e0e7-4d3f-a67b-77a321148530.png?v=1765378066","url":"https:\/\/www.ampstate.com\/products\/ljf46400cu31x","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}