{"product_id":"square-d-lra36400u31x-400a-600v-3-pole-plug-in-circuit-breaker","title":"Square D LRA36400U31X - 400 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eSquare D LRA36400U31X (400 A, 600 V, 3-Pole) Plug-In Molded Case Circuit Breaker is designed to deliver dependable branch-circuit overcurrent and short-circuit protection inside panelboards and load centers. Built for quick installation and reliable long-term performance, it’s a smart choice when upgrading or expanding electrical systems in residential, commercial, and light industrial settings.\u003c\/p\u003e \u003cp\u003eWhy this breaker stands out\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e minimizes installation time and simplifies replacement, reducing downtime when servicing panelboards or upgrading circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection by combining time-delay overload sensing with instantaneous short-circuit response for enhanced circuit safety.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e designed to work with matching Square D load centers and panelboards, ensuring a secure fit and consistent performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current, low-voltage capability\u003c\/strong\u003e rated for \u003cem\u003e400 A\u003c\/em\u003e at \u003cem\u003e600 V\u003c\/em\u003e, making it suitable for demanding branch circuits in a range of installations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTriple-pole configuration\u003c\/strong\u003e delivers robust protection for three-phase systems, helping prevent cascading faults and equipment damage.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat problems it solves\u003c\/h3\u003e \u003cp\u003eIn facilities with heavy electrical loads or expanding panels, the LRA36400U31X offers a reliable, immediate response to short circuits while providing smooth, predictable performance during longer overloads. Its plug-in design reduces field wiring complexity, and its thermal-magnetic mechanism helps prevent nuisance trips without sacrificing protection during real faults.\u003c\/p\u003e \u003ch3\u003eIdeal applications and use cases\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eResidential upgrades where a high-current, three-pole protection device is required in main or subpanels.\u003c\/li\u003e \u003cli\u003eCommercial electrical rooms and light industrial setups needing dependable branch-circuit protection for motor loads, HVAC, lighting, and feeders.\u003c\/li\u003e \u003cli\u003ePanelboard and load center modernization, replacement, or expansion projects where fast plug-in installation is advantageous.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eTechnical snapshot, in plain terms: Square D LRA36400U31X is a 400 A, 600 V, 3-pole plug-in molded case circuit breaker with a thermal-magnetic trip unit. It’s engineered to partner with matching OEM panelboards for a seamless, protected electrical system. If you’re wiring dense, multi‑circuit environments and want a breaker you can count on for quick installs and consistent performance, this model ticks the boxes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355329450146,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-lra36400u31x-400-a-600-v-3-pole-plug-in-circuit-breaker-649.webp?v=1788750929","url":"https:\/\/www.ampstate.com\/products\/square-d-lra36400u31x-400a-600v-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}