{"product_id":"square-d-lga36400u53x-400a-600v-3-pole-plug-in-circuit-breaker","title":"Square D LGA36400U53X - 400 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D LGA36400U53X — a 400 A, 600 V, 3-pole plug-in molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built to withstand demanding residential, commercial, and light industrial environments, this breaker combines quick installation with precise, dependable protection you can count on.\u003c\/p\u003e \u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e for rapid installation and easy replacement in compatible panelboards and load centers — minimizing downtime during upgrades or maintenance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection by combining long-term thermal overload sensing with instantaneous magnetic trip for short-circuit events.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole configuration\u003c\/strong\u003e ideal for three-phase systems, ensuring coordinated protection across all phases in commercial and light industrial applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e engineered to pair seamlessly with matching Square D load centers and panelboards, promoting proper fit, performance, and electrical coordination.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh current rating\u003c\/strong\u003e rated at 400 A and 600 V, delivering robust protection for sizable branch circuits without compromising reliability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this matters for your electrical system\u003c\/h2\u003e\n\u003cp\u003eIn any panelboard or load center, protecting wiring and equipment from overcurrents starts with the right breaker. The Square D LGA36400U53X is purpose-built to handle demanding loads while maintaining precise trip characteristics. The thermal-magnetic mechanism minimizes nuisance trips during normal ambient fluctuations, yet responds decisively to genuine faults, reducing the risk of insulation damage, equipment failure, or cascading outages.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eUpgrading or replacing 3-phase branch circuits in commercial spaces, warehouses, or light industrial facilities needing solid overcurrent protection.\u003c\/li\u003e \u003cli\u003eInstalling or expanding panelboards in residential settings that require robust 3-pole protection for multi-wire branch circuits and three-phase circuits.\u003c\/li\u003e \u003cli\u003eSituations where quick plug-in replacement minimizes downtime during electrical maintenance or panel upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical specifications at a glance\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Square D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e LGA36400U53X\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\u003eMounting Style:\u003c\/strong\u003e Plug-in\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 \u003ch2\u003ePractical considerations and installation tips\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eVerify compatibility with your specific panelboard or load center model to ensure optimal fit and coordinated trip curves.\u003c\/li\u003e \u003cli\u003eBefore installation, de-energize the enclosure and follow proper safety procedures; use the correct tooling to avoid damaging the plug-in contacts.\u003c\/li\u003e \u003cli\u003eWhen replacing an existing breaker, match the amperage, voltage rating, and pole configuration to maintain system protection levels and code compliance.\u003c\/li\u003e \u003cli\u003eLabel circuits clearly after installation to facilitate future maintenance and safety inspections.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTrust and compatibility\u003c\/h2\u003e\n\u003cp\u003eThe Square D LGA36400U53X is designed to work in harmony with matching OEM load centers and panelboards, reducing the guesswork during upgrades and ensuring electrical coordination across the system. If you’re aiming for a dependable, code-compliant solution for three-phase protection with swift installation, this 400 A, 3-pole plug-in breaker is engineered to meet the challenge.\u003c\/p\u003e \u003ch2\u003eWho it’s for\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eElectrical contractors and installers seeking a proven, plug-in solution for three-phase panel upgrades.\u003c\/li\u003e \u003cli\u003eFacility managers responsible for maintaining reliable power distribution in small to mid-size commercial or light industrial spaces.\u003c\/li\u003e \u003cli\u003eHomeowners or property owners planning panel enhancements that require robust branch circuit protection with minimal downtime.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the Square D LGA36400U53X, you’re choosing a trusted, purpose-built breaker that delivers decisive protection when it matters most, backed by a design that supports quick installation and long-term reliability in real-world panel systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355322372258,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/schnieder_and_square_d_breaker_and_panel_93f18293-10c2-42b7-b9f3-ec59fc3c7e04.png?v=1764691304","url":"https:\/\/www.ampstate.com\/products\/square-d-lga36400u53x-400a-600v-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}