{"product_id":"square-d-lja36400cu44x-powerpact-l-400a-3-pole-600v-i-line-molded-case-circuit-breaker","title":"Square D LJA36400CU44X PowerPact L 400A 3-Pole 600V I-Line Molded Case Circuit Breaker","description":"\u003cdiv class=\"product-description\"\u003e\n\n  \u003ch2\u003eSquare D LJA36400CU44X – PowerPact L Molded Case Circuit Breaker\u003c\/h2\u003e\n  \u003cp\u003eThe \u003cstrong\u003eSquare D LJA36400CU44X\u003c\/strong\u003e (by Schneider Electric) is a high-performance \u003cstrong\u003e400-Amp, 3-Pole, 600V Molded Case Circuit Breaker\u003c\/strong\u003e from the PowerPact L family. Designed for demanding commercial and industrial power distribution systems, this I-Line style plug-in breaker combines advanced solid-state protection with a 100% continuous duty rating — making it one of the most reliable solutions for switchboards and panelboards operating at 600VAC.\u003c\/p\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e400A Continuous Rating (100% Rated)\u003c\/strong\u003e – Operates at full ampacity without derating\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMicroLogic 6.3A Electronic Trip Unit\u003c\/strong\u003e – Solid-state LSIG protection: Long-Time, Short-Time, Instantaneous, and Ground Fault\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eI-Line Style Plug-In Mounting\u003c\/strong\u003e – Fast, tool-free installation into compatible Square D I-Line panelboards\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBuilt-In Ammeter Display\u003c\/strong\u003e – Real-time current monitoring via non-interchangeable MicroLogic Ammeter\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePush-to-Trip Test Button\u003c\/strong\u003e – Manual trip verification without load disconnection\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTrip-Free Mechanism\u003c\/strong\u003e – Breaker trips even if handle is held or blocked\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMultiple Certifications\u003c\/strong\u003e – UL 489, CSA, IEC, CE, CCC, NOM (NMX), NEMA compliant\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCurrent Limiting\u003c\/strong\u003e – Reduces let-through energy to protect downstream equipment\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLJA36400CU44X\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSquare D \/ Schneider Electric\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Family\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePowerPact L\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrame Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLJA\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Poles\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 (also usable in 2-pole applications)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAmpere Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e600V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTrip Unit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMicroLogic 6.3A – Electronic (Solid State), LSIG\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eI-Line Style Plug-In\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnection (Line Side)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eI-Line Plug-In\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnection (Load Side)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLug Terminals (AWG 3\/0 – 500 kcmil, Al\/Cu)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterrupting Rating @ 240V AC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 kAIC\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterrupting Rating @ 480V AC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e65 kAIC\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterrupting Rating @ 600V AC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 kAIC\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDC Interrupting Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 kA @ 250V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDuty Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100% Rated\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePhase\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-Phase\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals \/ Certifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL 489, CSA, IEC 60947-2, CE, CCC, NOM, NEMA\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14.7\"H x 5.94\"W x 6.61\"D\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eTrip Functions – LSIG Protection Explained\u003c\/h2\u003e\n  \u003cp\u003eThe \u003cstrong\u003eMicroLogic 6.3A trip unit\u003c\/strong\u003e provides four layers of protection in a single breaker:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eL – Long-Time:\u003c\/strong\u003e Protects against sustained overloads\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS – Short-Time:\u003c\/strong\u003e Allows temporary inrush currents while still protecting against faults\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eI – Instantaneous:\u003c\/strong\u003e Immediately trips on high-magnitude short circuits\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eG – Ground Fault:\u003c\/strong\u003e Detects and interrupts ground fault currents to protect personnel and equipment\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eTypical Applications\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eCommercial buildings and industrial facilities\u003c\/li\u003e\n    \u003cli\u003eMain and feeder circuit protection in Square D I-Line switchboards\u003c\/li\u003e\n    \u003cli\u003eMotor control centers (MCCs)\u003c\/li\u003e\n    \u003cli\u003eData centers and critical infrastructure\u003c\/li\u003e\n    \u003cli\u003eConstruction and utility power distribution\u003c\/li\u003e\n    \u003cli\u003eHeavy manufacturing and process equipment\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eWhy Choose the Square D LJA36400CU44X?\u003c\/h2\u003e\n  \u003cp\u003eWhen uptime and safety are non-negotiable, the PowerPact L family delivers. The LJA36400CU44X offers precise electronic overcurrent protection with an integrated ammeter — eliminating the need for separate metering in many applications. Its I-Line plug-in design dramatically reduces installation time, and its 100% continuous duty rating means no derating on the job site.\u003c\/p\u003e\n  \u003cp\u003eBacked by Schneider Electric's global engineering and certified to UL, CSA, IEC, and international standards, this breaker is built to perform in the most demanding environments.\u003c\/p\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003ch3\u003eWhat is the Square D LJA36400CU44X?\u003c\/h3\u003e\n  \u003cp\u003eThe LJA36400CU44X is a 400-Amp, 3-Pole, 600V AC molded case circuit breaker from Square D's PowerPact L series. It features an I-Line plug-in mount and a MicroLogic 6.3A solid-state LSIG trip unit with built-in ammeter.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat does \"I-Line style plug-in\" mean?\u003c\/h3\u003e\n  \u003cp\u003eI-Line is Schneider Electric's proprietary bus connection system for PowerPact circuit breakers. It allows the breaker to plug directly into a compatible Square D I-Line panelboard without additional wiring on the line side — enabling faster, safer installation.\u003c\/p\u003e\n\n  \u003ch3\u003eIs the LJA36400CU44X 100% rated?\u003c\/h3\u003e\n  \u003cp\u003eYes. This breaker is 100% continuously rated, meaning it can operate at its full 400A ampacity indefinitely without derating — unlike standard 80% rated breakers that must be derated to 320A in continuous operation.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat is LSIG protection?\u003c\/h3\u003e\n  \u003cp\u003eLSIG stands for Long-Time, Short-Time, Instantaneous, and Ground Fault — the four protective trip functions built into the MicroLogic 6.3A trip unit. Together, they provide comprehensive protection against overloads, short circuits, and ground faults.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat certifications does this breaker carry?\u003c\/h3\u003e\n  \u003cp\u003eThe LJA36400CU44X is certified by UL (UL 489), CSA, IEC (IEC 60947-2), CE, CCC, NOM, and NEMA — making it suitable for use in North American and international electrical systems.\u003c\/p\u003e\n\n  \u003ch3\u003eCan this breaker be used in 2-pole applications?\u003c\/h3\u003e\n  \u003cp\u003eYes. The LJA36400CU44X can be configured for 2-pole applications as well as its standard 3-pole configuration.\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Square D \/ Schneider Electric","offers":[{"title":"New","offer_id":48396210110712,"sku":"LJA36400CU44X-N","price":4799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/1209\/3176\/files\/LJA36400U44X-fr_1500.jpg?v=1778795240","url":"https:\/\/alphabreakersandcontrols.com\/products\/square-d-lja36400cu44x-powerpact-l-400a-3-pole-600v-i-line-molded-case-circuit-breaker","provider":"Alpha Breakers \u0026 Controls","version":"1.0","type":"link"}